Attachment 1_Performance Specification for the Electronic Personal Dosimeter_Rev 10 dtd 15DEC2023.pdf

PRF TBD

Original Design Activity

CAGE Code 0FW37 15 December 2023

PERFORMANCE SPECIFICATION

ITEM SPECIFICATION

FOR THE

ELECTRONIC PERSONAL DOSIMETER

Revision 10

Prepared for:

N00167-24-R-0040

Prepared by:

Naval Surface Warfare Center Carderock Division 9500 MacArthur Boulevard West Bethesda, MD 20817

SUBMITTED BY:

Colin Rook Engineer

NSWCCD

APPROVED FOR USE AS

FUNCTIONAL BASELINE BY:

Technical Warrant Holder

NAVSEA 09RD

Performance Specification for the Electronic Personal Dosimeter

1 SCOPE

1.1 Scope: This technical specification defines the requirements for a Navy Electronic

Personal Dosimeter (EPD) system.

1.2 Introduction: The Navy requires an EPD system consisting of photon EPDs, beta-photon EPDs, and neutron-photon EPDs, including associated accessories, to use as a secondary dosimeter to monitor radiological operations in real-time for several primary end uses: Naval Nuclear Propulsion Program (NNPP), Radiological Affairs Support Program (RASP), Emergency Operations (EO) and Bureau of Medicine and Surgery (BUMED).

1.3 Objectives: NAVSEA 09RD, the Navy RADIAC Program Office, through the Naval

Surface Warfare Center Carderock Division (NSWCCD) will procure an EPD system in order to monitor the above required end-use radiological operations.

2 APPLICABLE DOCUMENTS

2.1 The following standards and specifications are referenced in the stated requirements of the technical specification:

2.1.1 ANSI N13.11-2022 “Personnel Dosimetry Performance-Criteria for Testing”

2.1.2 ANSI N42.17A-2003 "Portable Instrumentation for Use in Normal Environmental

Conditions"

2.1.3 ANSI N42.20-2003 “Performance Criteria for Active Personnel Radiation Monitors”

2.1.4 IEC 60068-2-11: 1981 “Basic Environmental Testing Procedures - Part 2-11: Tests”

2.1.5 MIL-STD-167-1A “Mechanical Vibrations of Shipboard Equipment (Type I -

Environmental and Type II - Internally Excited)”

2.1.6 MIL-STD-461G “Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment”

2.1.7 MIL-STD-464D “Electromagnetic Environmental Effects Requirements for Systems”

2.1.8 MIL-STD-810H “Environmental Engineering Considerations and Laboratory Tests”

2.1.9 DOD-STD-1399-70-1 NOT 1 “Interface Standard for Shipboard Systems Section 070 - Part 1 D.C. Magnetic Field Environment (Metric)”

2.2 In the event of a conflict between the text of this specification and the references cited herein, the contractor shall immediately notify the Contracting Officer’s Representative (COR) or Technical Advisor (TA) identified in NAVSEA Clause G-242-H001 GOVERNMENT CONTRACT ADMINISTRATION under section TBD, in writing.

Nothing in this Performance Specification Document however, shall supersede applicable laws and regulations unless a specified exemption has been obtained in writing by the Contracting Officer’s Representative (COR) and Contracting Officer identified in NAVSEA clause G-242-H001 under section TBD. Any conflict noted by the contractor shall be identified immediately to the COR or TA in writing.

3 TECHNICAL SPECIFICATION

3.1 Radiological

3.1.1 Dose and Dose-Rate Range: The EPD shall detect and record exposure to ionizing radiation in deep dose [1000 milligrams/square centimeters (mg/cm2)] and in shallow dose (7 mg/cm2) equivalent rates from 0.1 mrem/hour (hr) through 200 rem/hr and in deep dose equivalence and in shallow dose equivalence from 0.1 mrem through 200 rem for photon energies from 20 kilo-electron Volts (keV) through 7 Mega-electron Volts (MeV).

3.1.2 Dose Retention: Following an exposure period, the dose indicated by the EPD shall not deviate by greater than ±2% or 0.1 mrem, whichever is greater, over the next eight hours, excluding background contribution.

3.1.3 Power Loss: Upon return of its principle power, following a 24-hour power loss, the dose indicated by the EPD shall not have deviated by greater than ±2% or 0.1 mrem, whichever is greater, from the pre-power loss indication, excluding background contribution.

3.1.4 Lower Limit of Detection/Detection Threshold: The detection threshold and resolution shall not exceed 0.1 mrem for Cs-137 photons.

3.1.5 Accuracy: Over the required dose and dose-rate equivalent range, the EPD dose equivalent (rem) reading shall not differ by more than ±10% or 1 mrem, whichever is greater, from the conventionally true dose equivalent value for Cs-137.

3.1.6 Photon Energy Range:

3.1.6.1 Low Energy Photons: The deep dose response, in the calibration direction, to incident radiation of energy between 50 keV and 1.5 MeV shall not differ by more than ±20% from the response to the Cs-137 (662 keV) reference gamma radiation source.

3.1.6.2 High Energy Photons: The deep dose response, in the calibration direction, to incident radiation of energy between 1.5 MeV and 7 MeV shall be within -30% to +67% from the response to the Cs-137 (662 keV) reference gamma radiation

3.1.7 Angular Response (ref ANSI N42.20-2003, 5.3.14 and Annex B): For two planes, one horizontal and one vertical through the front face of the EPD (see Figure B.1), the ratio of the reading at α angle relative to the reading at α = 0° for angles from 0° to ±75° shall be within ±20% of the ratios given in Table B.1 for Cs-137 and within ±50% of the ratios for Am-241 (or 60 keV filtered X radiation). The manufacturer shall state the response at 90°.

3.1.8 Saturation: The saturation level of the EPD shall be greater than or equal to 400 rem/hr or 1,200 rem.

3.1.9 Precision: The EPD shall be exposed to dose equivalent of 0.1 rem, 1 rem, and 100 rem using Cs-137. At each of these dose equivalent levels, ten replicate measurements shall be obtained and the variance of the measurements calculated.

The variance at each level shall not exceed +/-5%.

3.1.10 Neutron Response:

3.1.10.1 Neutron Energy Range: The neutron-photon EPD shall measure neutrons with energies from thermal to the highest radiation weighting factors (i.e., 20 MeV).

3.1.10.2 Neutron Dose Range: The EPD shall have a lower limit of detection for neutrons of 0.005 rem and a maximum protection range capability of 5 rem. The EPD shall measure neutron accident doses between 5 rad and 850 rad with a neutron energy of 1.5 MeV.

3.1.10.3 Neutron Accuracy: Over the required dose equivalent range, the neutron-photon

EPD dose equivalent (rem) reading shall not differ by more than ±20% from the conventionally true dose equivalent value for moderated Cf-252.

3.1.11 Beta Response:

3.1.11.1 Beta Energy Range: The beta-photon EPD shall measure beta particles with average energies ranging from 220 keV to 1.5 MeV.

3.1.11.2 Beta Dose Range: The beta-photon EPD shall have a lower limit of detection for beta particles of 0.01 rem and a maximum protection range capability of 1000 rem.

3.1.11.3 Beta Accuracy: Over the required dose equivalent range, the beta-photon EPD dose equivalent (rem) reading shall not differ by more than ±20% from the conventionally true dose equivalent value for Sr-90/Y-90.

3.1.12 INTENTIONALLY LEFT BLANK.

3.1.13 National Voluntary Laboratory Accreditation Program (NVLAP): The EPD shall be capable of meeting the testing requirements for NVLAP accreditation, as defined by ANSI N13.11-2022, Test Categories 1A and 2A.

3.2 Physical

3.2.1 Size: The overall dimensions of the photon EPD, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed 10 centimeters (cm) in length, 7 cm in width, and 2.5 cm in thickness. The overall dimensions of the neutron-photon EPD, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed 14.1 cm in length, 7 cm in width, and 2.8 cm in thickness. The overall dimensions of the beta-photon EPD, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed 12.2 cm in length, 7 cm in width, and 2.8 cm in thickness.

3.2.2 Weight: The weight of the photon EPD, with telemetry capability, shall not exceed 110 grams (g), including battery(ies) and clip. The weight of the neutron-photon EPD, with telemetry capability, shall not exceed 173 grams (g), including battery(ies) and clip.

The weight of the beta-photon EPD, with telemetry capability, shall not exceed 112 grams (g), including battery(ies) and clip.

3.2.3 Power: The EPD power source shall be commercial-off-the-shelf (COTS) alkaline battery(ies), capable of sustaining normal dosimeter operation for a minimum of 40 continuous days. Normal operation also includes internal dosimeter functions that may occur infrequently, such as alarms or indications resulting from self-diagnostics.

3.2.4 Display: The display shall provide clearly visible and instantly recognizable digital indication in both high-level light (full sunlight) and low-level light (darkness), while the EPD is attached at the user’s chest or waist. The display may be illuminated to meet this requirement. The display shall show, at minimum, dose and dose rate.

3.2.5 Self-Diagnostics: The EPD shall automatically perform internal self-diagnostics and quality control checks.

3.2.6 Corrosion Resistance: All parts and materials used shall be corrosion resistant, either inherently or by use of suitable non-hazardous material surface treatments, or otherwise protected from the corrosive elements expected to be encountered during use – for example, battery leakage.

3.2.7 Chip and Crack Resistance: All parts and materials used for the EPD and accessories shall be resistant to chips and cracks expected to be encountered during use.

3.2.8 External Controls: External controls, such as buttons and switches, shall be clearly identified, be adequately protected from accidental or unauthorized operation, have provisions to reduce the possibility of inadvertent changes in controls/settings and avoid interference with the dose equivalent integrating function while the EPD is operated.

3.2.9 Battery Compartment: Access to the battery compartment shall be suitably restricted/protected to prevent inadvertent or unintentional battery removal or disconnection.

3.2.10 Primary Attachment - Clip: A replaceable clip shall securely affix the EPD to the user’s body with attention given to the necessary orientation of the detector, alarms, and indicators. The clip shall be of sufficient strength to resist separation of clip from EPD under a constant force of five pounds in any direction. The clip shall be of sufficient strength to resist separation of clip-EPD assembly from mounting/attaching to a surface/object, for example, a clothing pocket.

3.2.11 Secondary Attachment - Lanyard: The EPD shall be designed such that the associated lanyard can be looped through the EPD main body or case, as opposed to the lanyard being looped through the EPD clip. The lanyard shall incorporate a safety release mechanism to prevent choke hazards.

3.2.12 Alarms:

3.2.12.1 Alarm Types: Three alarms/alerting indicators shall be provided: one shall be audible, one shall be vibratory, and the other shall be visual. Alarms shall remain activated until reset manually.

3.2.12.1.1 Audible: The EPD shall produce an audible, pulsed alarm with interval less than or equal to two seconds. The volume shall be greater than or equal to 85 dBA at the ears, if the EPD is worn at the recommended body position. The audible alarm volume shall not exceed 100 dBA at 30 cm from EPD. The audible alarm shall be capable of being interrupted, by deliberate action, without interrupting the visual alarm.

3.2.12.1.2 Vibratory: The EPD shall produce vibrations that can be felt through a cotton shirt.

3.2.12.1.3 Visual: Where ambient noise levels would make other alarms inaudible, a visual signal shall be provided.

3.2.12.2 Normal Operation: Activation of the alarm/indicators shall not reset the dosimeter, freeze the display or terminate dose accumulation.

3.2.12.3 Programmed Setting: The alarms/indicators shall be activated when selected/programmed conditions are met. Dose and dose rate alarm set-points shall be programmable to any level (for both deep and shallow dose) in effective range with the capability to be set or adjusted only through the use of access-controlled software.

3.2.12.4 Dose and Dose-Rate Alarm Accuracy: When the instrument is subjected to dose equivalent rates of 0.80 of the dose equivalent rate alarm set point for ten min, the alarm shall not be activated for more than 10% of the period of the test. Similarly, at a dose equivalent rate of 1.2 of the alarm level set, the alarm shall be activated at 90% of the period of test. When the instrument is subjected to dose equivalent rates of 1.20 of the dose equivalent rate alarm set point, the alarm should actuate within 5 s or within a time such that the product of this time and the dose equivalent rate of the alarm point is less than 10 μSv (1 mrem).

3.2.12.5 Low Battery: A low battery warning/condition shall be indicated when the low battery set point is reached at least 24 hours before failure. The ‘low battery’ warning indication shall remain present until the battery is replaced.

3.2.12.6 Inaccurate or Suspect Operation: Indication shall be given of any condition that renders the EPD incapable of performing to the requirements of this document, for example, accurately measuring and displaying dose, or alarming at dose or dose rate alarm set-points. Such suspect conditions include, but are not limited to, low power, detector malfunction and high dose rate fields.

3.2.13 Calibration:

3.2.13.1 The EPD shall be initially calibrated by the contractor using photon sources traceable to the National Institute of Standards and Technology (NIST) (identified as the process of maintaining a documented unbroken chain of calibration certifications that can be traced back to NIST standards) or equivalent international standardized institution.

3.2.13.2 The neutron-photon EPD shall be calibrated to the moderated Cf-252 neutron spectrum using a moderated Cf-252 neutron source or to the AmBe neutron spectrum using an AmBe neutron source as delineated in Table 2d of ANSI N13.11-2022.

3.2.13.3 The beta-photon EPD shall be calibrated to the Sr-90/Y-90 beta spectrum using a Sr-90/Y-90 beta source as delineated in Table 2c of ANSI N13.11-2022.

3.2.13.4 The EPD should deliver the required level of performance/proficiency over a desired life expectancy of 10 years, without requiring recalibration. The EPD shall deliver the required level of performance/proficiency over a life expectancy of five

(5) years, without requiring calibration.

3.2.13.5 The EPD shall have an access-controlled functionality to adjust bias (response adjustment) within +15% from the original calibration parameters without any resulting errors.

3.2.14 End-Use Physical Distinction: The EPD shall have at least one visible part or component that is available in a variety of colors in order to physically distinguish among end uses, and that can be configured or applied by the Navy maintenance activity. The color of this component shall be easily discernible by simply glancing at the EPD, whether worn by a user or in storage.

3.3 Environmental

3.3.1 Temperature, Relative Humidity and Pressure: The EPD response shall meet all physical and performance requirements under the following conditions:

Operational:

3.3.1.1 when in use, and following use, at any temperature in the range of -25º

Celsius (C) to +50ºC, and 95% Relative Humidity (RH) at >25ºC

3.3.1.2 when the temperature is increased from +20ºC to +50ºC, and decreased from

+20ºC to -10ºC, each in less than 5 minutes

3.3.1.3 when the temperature is decreased from +50ºC to +20ºC, and increased from

-10ºC to +20ºC, each in less than 5 minutes

3.3.1.4 when in use, and following use, at +35ºC and any RH level in the range of

20% to 90% RH

3.3.1.5 when in use, and following use, at 69.5 kPa

Storage:

3.3.1.6 when stored, and following storage, at any temperature in the range of -40 ºC to +70ºC; 95% RH at >25ºC

3.3.1.7 when stored, and following storage, at 57.2 kPa

“Operational” is defined as receiving and recording exposure or being read or programmed.

“Storage” is defined as not being read/programmed, or used for dose monitoring, for a minimum of 24 hours.

3.3.2 Vibration: The EPD shall meet all physical and performance requirements during and following the Type I environmental vibration conditions that may be encountered aboard naval ships in accordance with MIL-STD-167-1A.

3.3.3 Drop: The EPD shall meet all physical and performance requirements following MIL- STD-810H, Method 516.8, section 4.6.5 Transit Drop (Procedure IV), Table 516.8-X.

Tactical Transport Drop Test for Unpackaged Handling Scenario.

3.3.4 Moisture Resistance: The EPD shall meet all physical and performance requirements during and following exposure to water spray in accordance with ANSI N42.20-2003, section 6.4.3.

3.3.5 Salt Fog: The EPD shall meet all physical and performance requirements during and following exposure to a salt fog environment for a 48-hour duration in accordance with IEC-60068-2-11:1981 Test Ka: Salt Mist or equivalent standard.

3.3.6 Electromagnetic Interference:

3.3.6.1 The EPD shall meet the Control of Electromagnetic Interference requirements of MIL-STD-461G for surface ships and submarines. The specific MIL-STD- 461G requirements are RS101, RS103 [2 Megahertz (MHz) to 18 Gigahertz (GHz) at 200 Volts/meter (V/m)] and RE102.

3.3.6.2 The EPD shall meet the DC Magnetic Field Environment requirements of MIL- STD-1399, Section 070, Part 1. The MIL-STD-1399, Section 070, Part 1, requirement is 1600 Amperes/meter (A/m).

3.3.6.3 EPD performance shall not be degraded by use in proximity to common industrial or public sources of electromagnetic interference. Such sources include the following:

1) Tungsten Inert Gas (TIG) welding: AC current, Magnetic Field frequency span of 50 Hz to 200 Hz, Magnetic Field strength span of 150 A/m to 300 A/m

2) Electronic Article Surveillance (EAS) systems (for example, retail store anti-theft monitors): Magnetic Field frequency span of 50 kHz to 150 kHz at 30 A/m Magnetic Field strength; Magnetic Field frequency span of 200 Hz to 500 Hz at 1,000 A/m Magnetic Field strength

3) Wireless charging equipment, such as that used for mobile phones:

Magnetic Field frequency span of 110 kHz to 205 kHz

3.3.7 Hazards of Electromagnetic Radiation to Ordnance: The EPD radiated emissions shall not exceed the Hazards of Electromagnetic Radiation to Ordnance (HERO) requirements of MIL-STD-464D, section 5.9.3, Table IX, Frequency Range up to 6,000 MHz using the Average Restricted Field Intensity limit.

3.3.8 Electrostatic Discharge: The EPD shall meet all physical and performance requirements during exposure to electrostatic discharges at intensities of up to 6 kilovolts (kV) for contact and 8 kV for air in accordance with ANSI N42.17A-2003, section 6.8.

3.3.9 Submersion: The EPD shall meet all physical and performance requirements while completely submerged under 20 meters of seawater in accordance with MIL-STD-

810H, Method 512.6, Procedure I - Immersion, with optional/accessory waterproof container/pouch allowed, excluding the audible alarm requirements of paragraph

3.2.12.1.1 herein. The EPD with optional/accessory waterproof container/pouch shall continue to provide a visual indication of an alarming condition when submerged under the above conditions.

3.3.10 Decontamination: The EPD shall be constructed of materials that can withstand common decontamination methods for radioactive materials and other potential surface contaminants, such as: water rinse, pressurized air, pressurized steam, scrubbing/scraping, chemical disinfection, dry heat sterilization, steam sterilization, etc.

3.3.11 Self-Irradiation/False Signal Due to Inherent Effects: The total inherent radiation contribution due to dosimeter construction materials and electronic noise shall be less than 0.06 mrem/day.

3.4 Telemetry

3.4.1 The EPD shall be capable of wireless telemetry and incorporation into a telemetry network with other radiation detection devices, including, but not limited to, gamma radiation area monitors. The EPD shall be telemetry capable while meeting 3.2.1 Size and 3.2.2 Weight.

4 VERIFICATION

4.1 Radiological

4.1.1 Dose and Dose-Rate Range: The EPD shall detect and record exposure to ionizing radiation in deep dose (1000 mg/cm2) and in shallow dose (7 mg/cm2) equivalent rates from 0.1 mrem/hr through 200 rem/hr and in deep dose equivalence and in shallow dose equivalence from 0.1 mrem through 200 rem for photon energies from 20 keV through 7 MeV.

4.1.2 Dose Retention: Following an exposure period, the dose indicated by the EPD shall not deviate by greater than ±2% or 0.1 mrem, whichever is greater, over the next eight hours, excluding background contribution.

4.1.3 Power Loss: Upon return of its principle power, following a 24-hour power loss, the dose indicated by the EPD shall not have deviated by greater than ±2% or 0.1 mrem, whichever is greater, from the pre-power loss indication, excluding background contribution.

4.1.4 Lower Limit of Detection/Detection Threshold: The EPD detection threshold and resolution shall not exceed 0.1 mrem for Cs-137 photons.

4.1.5 Accuracy: Over the required dose and dose-rate equivalent range, the dose equivalent (rem) reading shall not differ by more than ±10% or 1 mrem, whichever is greater, from the conventionally true dose equivalent value for Cs-137.

4.1.6 Photon Energy Range:

4.1.6.1 Low Energy Photons: The EPD deep dose response, in the calibration direction, to incident radiation of energy between 50 keV and 1.5 MeV shall not differ by more than ±20% from the response to the Cs-137 (662 keV) reference gamma radiation

4.1.6.2 High Energy Photons: The EPD deep dose response, in the calibration direction, to incident radiation of energy between 1.5 MeV and 7 MeV shall be within -30% to +67% from the response to the Cs-137 (662 keV) reference gamma radiation

4.1.7 Angular Response (Reference ANSI N42.20-2003, 5.3.14 and Annex B): For two planes, one horizontal and one vertical through the front face of the EPD (see Figure B.1), the ratio of the reading at α angle relative to the reading at α = 0° for angles from 0° to ±75° shall be within ±20% of the ratios given in Table B.1 for Cs-137 and within ±50% of the ratios for Am-241 (or 60 keV filtered X radiation). The manufacturer shall state the response at 90°.

4.1.8 Saturation: The EPD saturation level shall be greater than or equal to 400 rem/hr or 1,200 rem.

4.1.9 Precision: The EPD shall be exposed to dose equivalent of 0.1 rem, 1 rem, and 100 rem using Cs-137. At each of these dose equivalent levels, ten replicate measurements shall be obtained and the variance of the measurements calculated.

The variance at each level shall not exceed +/-5%.

4.1.10 Neutron Response:

4.1.10.1 Neutron Energy Range: The neutron-photon EPD shall measure neutrons with energies from thermal to the highest radiation weighting factors (i.e., 20 MeV).

4.1.10.2 Neutron Dose Range: The neutron-photon EPD shall have a lower limit of detection for neutrons of 0.005 rem, maximum protection range capability of 5 rem and shall measure neutron accident doses between 5 rad and 850 rad with a neutron energy of 1.5 MeV.

4.1.10.3 Neutron Accuracy: Over the required dose equivalent range, the neutron-photon

EPD dose equivalent (rem) reading shall not differ by more than ±20% from the conventionally true dose equivalent value for moderated Cf-252.

4.1.11 Beta Response:

4.1.11.1 Beta Energy Range: The beta-photon EPD shall measure beta particles with average energies ranging from 220 keV to 1.5 MeV.

4.1.11.2 Beta Dose Range: The beta-photon EPD shall have a lower limit of detection for beta particles of 0.01 rem and maximum protection range capability of 1000 rem.

4.1.11.3 Beta Accuracy: Over the required dose equivalent range, the beta-photon EPD dose equivalent (rem) reading does not differ by more than ±20% from the conventionally true value for Sr-90/Y-90.

4.1.12 INTENTIONALLY LEFT BLANK.

4.1.13 National Voluntary Laboratory Accreditation Program (NVLAP): The EPD shall be capable of meeting the testing requirements for NVLAP accreditation, as defined by ANSI N13.11-2022, Test Categories 1A and 2A.

4.2 Physical

4.2.1 Size: The photon EPD overall dimensions, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed 10 centimeters (cm) in length, 7 cm in width, and 2.5 cm in thickness. The neutron-photon EPD overall dimensions, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed

14.1 cm in length, 7 cm in width, and 2.8 cm in thickness. The beta-photon EPD overall dimensions, with telemetry capability, excluding any clip or retaining/attaching device, shall not exceed 12.2 cm in length, 7 cm in width, and 2.8 cm in thickness.

4.2.2 Weight: The photon EPD weight, with telemetry capability, shall not exceed 110 grams (g), including battery(ies) and clip. The neutron-photon EPD weight, with telemetry capability, shall not exceed 173 grams (g), including battery(ies) and clip.

The beta-photon EPD weight, with telemetry capability, shall not exceed 112 grams (g), including battery(ies) and clip.

4.2.3 Power: The EPD power source shall use a commercial-off-the-shelf (COTS) alkaline battery(ies), capable of sustaining normal dosimeter operation for a minimum of 40 continuous days. Normal operation also includes internal dosimeter functions that may occur infrequently, such as alarms or indications resulting from self-diagnostics.

4.2.4 Display: The EPD display shall provide clearly visible and instantly recognizable digital indication in both high-level light (full sunlight) and low-level light (darkness), while attached at the user’s chest or waist. The display may be illuminated to meet this requirement. The display shall show, at minimum, dose and dose rate.

4.2.5 Self-Diagnostics: The EPD shall automatically perform internal self-diagnostics and quality control checks.

4.2.6 Corrosion Resistance: The EPD parts and materials shall use corrosion resistant, either inherently or by use of suitable non-hazardous material surface treatments, or otherwise protected from the corrosive elements expected to be encountered during use – for example, battery leakage.

4.2.7 Chip and Crack Resistance: All parts and materials used in the EPD, including accessories, shall be resistant to chips and cracks expected to be encountered during use.

4.2.8 External Controls: The EPD external controls, such as buttons and switches, shall be clearly identified, adequately protected from accidental or unauthorized operation, shall have provisions to reduce the possibility of inadvertent changes in controls/settings and avoid interference with the dose equivalent integrating function while the EPD is operated.

4.2.9 Battery Compartment: The EPD access to the battery compartment shall be suitably restricted/protected to prevent inadvertent or unintentional battery removal or disconnection.

4.2.10 Primary Attachment - Clip: The EPD shall have a replaceable clip to securely affix the EPD to the user’s body with attention given to the necessary orientation of the detector, alarms, and indicators. The clip shall be of sufficient strength to resist separation of clip from EPD under a constant force of five pounds in any direction.

The clip shall be of sufficient strength to resist separation of clip-EPD assembly from mounting/attaching to a surface/object, for example, a clothing pocket.

4.2.11 Secondary Attachment - Lanyard: The EPD design shall include an associated lanyard that can be looped through the EPD main body or case, as opposed to the lanyard being looped through the EPD clip. The lanyard shall incorporate a safety release mechanism to prevent choke hazards.

4.2.12 Alarms:

4.2.12.1 Alarm Types: The EPD shall provide three alarms/alerting indicators: one shall be audible, one shall be vibratory, and the other shall be visual. Alarms shall remain activated until reset manually.

4.2.12.1.1 Audible: The EPD shall produce an audible, pulsed alarm with interval less than or equal to two seconds. The volume shall be greater than or equal to 85 dBA at the ears, if the EPD is worn at the recommended body position. The audible alarm volume shall not exceed 100 dBA at 30 cm from EPD. The audible alarm shall be capable of being interrupted, by deliberate action, without interrupting the visual alarm.

4.2.12.1.2 Vibratory: The EPD shall be able to produce vibrations that can be felt through a cotton shirt.

4.2.12.1.3 Visual: Where ambient noise levels would make other alarms inaudible, the EPD shall provide a visual signal.

4.2.12.2 Normal Operation: Activation of the alarm/indicators shall not reset the dosimeter, freeze the display or terminate dose accumulation.

4.2.12.3 Programmed Setting: The EPD alarms/indicators shall activate when selected/programmed conditions are met. Dose and dose rate alarm set-points shall be programmable to any level (for both deep and shallow dose) in effective range with the capability to be set or adjusted only through the use of access-controlled software.

4.2.12.4 Dose and Dose-Rate Alarm Accuracy: When the EPD is subjected to dose equivalent rates of 0.80 of the dose equivalent rate alarm set point for ten min, the EPD alarm shall not be activated for more than 10% of the period of the test.

Similarly, at a dose equivalent rate of 1.2 of the alarm level set, the alarm shall be activated at 90% of the period of test. When the EPD is subjected to dose equivalent rates of 1.20 of the dose equivalent rate alarm set point, the alarm shall actuate within 5 s or within a time such that the product of this time and the dose equivalent rate of the alarm point is less than 10 μSv (1 mrem).

4.2.12.5 Low Battery: The EPD shall indicate a low battery warning/condition when the low battery set point is reached at least 24 hours before failure. The ‘low battery’ warning indication shall remain present until the battery is replaced.

4.2.12.6 Inaccurate or Suspect Operation: The EPD shall give an indication of any condition that renders the EPD incapable of performing to the requirements of this document, for example, accurately measuring and displaying dose, or alarming at dose or dose rate alarm set-points. Such suspect conditions include, but are not limited to, low power, detector malfunction and high dose rate fields.

4.2.13 Calibration:

4.2.13.1 The EPD initial calibration shall use photon sources traceable to the National

Institute of Standards and Technology (NIST) (identified as the process of maintaining a documented unbroken chain of calibration certifications that can be traced back to NIST standards) or equivalent international standardized institution.

4.2.13.2 The neutron-photon EPD shall be initially calibrated to the moderated Cf-252 neutron spectrum using a moderated Cf-252 neutron source or to the AmBe neutron spectrum using an AmBe neutron source as delineated in Table 2d of

ANSI N13.11-2022.

4.2.13.3 The beta-photon EPD shall be initially calibrated to the Sr-90/Y-90 beta spectrum using a Sr-90/Y-90 beta source as delineated in Table 2c of ANSI N13.11-2022.

4.2.13.4 The EPD should deliver the required level of performance/proficiency over a desired life expectancy of 10 years, without requiring recalibration. The EPD shall deliver the required level of performance/proficiency over a life expectancy of five

(5) years, without requiring calibration.

4.2.13.5 The EPD shall have an access-controlled functionality to adjust bias (response adjustment) within +15% from the original calibration parameters without any resulting errors.

4.2.14 End-Use Physical Distinction: The EPD shall have at least one visible part or component that is available in a variety of colors in order to physically distinguish among end uses, and that can be configured or applied by the Navy maintenance activity. The color of this component shall be easily discernible by simply glancing at the EPD, whether worn by a user or in storage.

4.3 Environmental

4.3.1 Temperature and Relative Humidity: The EPD shall meet all physical and performance requirements under the operational and storage conditions listed in section 3.3.1.1 through section 3.3.1.7.

4.3.2 Vibration: The EPD shall meet all physical and performance requirements during and following the Type I environmental vibration conditions that may be encountered aboard naval ships in accordance with MIL-STD-167-1A.

4.3.3 Drop: The EPD shall meet all physical and performance requirements following MIL- STD-810H, Method 516.8, section 4.6.5 Transit Drop (Procedure IV), Table 516.8-X.

Tactical Transport Drop Test for Unpackaged Handling Scenario.

4.3.4 Moisture Resistance: The EPD shall meet all physical and performance requirements during and following exposure to water spray in accordance with ANSI N42.20-2003, section 6.4.3.

4.3.5 Salt Fog: The EPD shall meet all physical and performance requirements during and following exposure to a salt fog environment for a 48-hour duration in accordance with IEC-60068-2-11:1981 Test Ka: Salt Mist or equivalent standard.

4.3.6 Electromagnetic Interference:

4.3.6.1 The EPD shall meet the Control of Electromagnetic Interference requirements of MIL-STD-461G for surface ships and submarines. The specific MIL-STD-461G requirements are RS101, RS103 [2 Megahertz (MHz) to 18 Gigahertz (GHz) at 200 Volts/meter (V/m)] and RE102.

4.3.6.2 The EPD shall meet the DC Magnetic Field Environment requirements of MIL-STD- 1399, Section 070, Part 1. The MIL-STD-1399, Section 070, Part 1, requirement is 1600 Amperes/meter (A/m).

4.3.6.3 The EPD shall not degrade by use in proximity to common industrial or public sources of electromagnetic interference, as listed in section 3.3.6.3.

4.3.7 Hazards of Electromagnetic Radiation to Ordnance: The EPD radiated emissions shall not exceed the Hazards of Electromagnetic Radiation to Ordnance (HERO) requirements of MIL-STD-464D, section 5.9.3, Table IX, Frequency Range up to 6,000 MHz using the Average Restricted Field Intensity limit.

4.3.8 Electrostatic Discharge: The EPD shall meet all physical and performance requirements during exposure to electrostatic discharges at intensities of up to 6 kilovolts (kV) for contact and 8 kV for air in accordance with ANSI N42.17A-2003, section 6.8.

4.3.9 Submersion: The EPD shall meet all physical and performance requirements while completely submerged under 20 meters of seawater in accordance with MIL-STD- 810H, Method 512.6, Procedure I - Immersion, with optional/accessory waterproof container/pouch allowed, excluding the audible alarm requirements of paragraph

3.2.12.1.1 herein. The EPD with optional/accessory waterproof container/pouch shall continue to provide a visual indication of an alarming condition when submerged under the above conditions.

4.3.10 Decontamination: The EPD shall be constructed of materials that can withstand common decontamination methods for radioactive materials and other potential surface contaminants, such as: water rinse, pressurized air, pressurized steam, scrubbing/scraping, chemical disinfection, dry heat sterilization, steam sterilization, etc.

4.3.11 Self-Irradiation/False Signal Due to Inherent Effects: The EPD total inherent radiation contribution due to dosimeter construction materials and electronic noise shall be less than 0.06 mrem/day.

4.4 Telemetry

The EPD shall be capable of wireless telemetry and incorporation into a telemetry network with other radiation detection devices, including, but not limited to, gamma radiation area monitors. The EPD shall be telemetry capable while meeting 3.2.1 Size and 3.2.2 Weight.