Attachment 1 - Maritime Variant Requirements.pdf

Attachment 1

Personal Radiation Detector Maritime Variant Requirements

ID # Requirement Threshold Objective Clarification

Meets or

Does Not Meet

Reference/ Explanation

Available Test Data

OR-1 The system shall notify the operator of the presence of gamma radiation sources, including Special Nuclear Material (SNM) and Radiological Dispersal Device (RDD) sources, when the system and the source are static

Demonstrate a Probability of Detection (PD) of 80% or more when exposed for up to 30 seconds (dwell time) to Co-57 shielded by 5mm of steel producing 2.33 ± 10% 122 keV photons/cm2-second and separately to Ba-133 shielded by 5mm of steel producing 1.44 ± 10% 356 keV photons/cm2-second, based on a background of

7.5 μR/hr. Background exposure rate was measured with a GE RS

PIC.

Demonstrate a PD of 80% or more when exposed for up to 30 seconds (dwell time) to Co-57 shielded by 5mm of steel producing 1.27 ± 10% 122 keV photons/cm2-second and separately to Ba- 133 shielded by 5mm of steel producing 0.89 ± 10% 356 keV photons/cm2-second, based on a background of 7.5 μR/hr.

Background exposure rate was measured with a GE RS PIC.

Desired performance characteristics are the ability to detect the smallest amount of R/N material, with the most shielding, at the greatest distance, while maintaining a low probability of false alarms. The alarm signal threshold settings must be the same as those used for the false alarm tests, and device orientation must be as used in standard operations (on the belt for detection). For testing, the flux to be detected will be scaled as the square root of the ratio of the current test site background exposure rate to the background exposure rate on which the requirement was based. Scaling of the specified flux conditions for evaluation purposes will be done using a device more appropriate than the GE RS High Pressure Ionization Chamber (HPIC).

Radiation background measurement corresponding to that originally reported by the HPIC are scintillator with reported energy range of 25 keV to 3 MeV. The background will vary between 0.34 μR/hr to 25 μR/hr. An energy calibrated HPGe detector is used to measure and determine the counts in the appropriate region of interest and then determine the flux at the point where the PRDs’ reference points will be placed.

Indicate if test data is available and describe the source of the test data available to support statements that the PRD meets the requirements (e.g.

government agency testing, accredited laboratory, independent laboratory, unaffiliated third-party testing or vendor testing)

Available Test Data

FR-01-01 The device shall alarm rapidly upon exposure to radiation above a set alarm point.

In accordance with ANSI N42.32-2006, Section

6.3. Alarm within 2

seconds after exposure to an increase in the radiation level of 50 μR/h that occurs over a period of no more than 0.5 s.

Objective = Threshold

FR-01-02 The device shall have user adjustable settings for notification/alarm levels.

Allows user to set/change levels at which the device will alert the operator to the presence of gamma and neutron (if included) radiation.

Objective = Threshold This a unique indication for detection of radiation of interest for the security mission. OR-4 requires a separate settable/configurable alarm for personal safety levels.

OR-2

Key Performance Requirement

(KPP)

The system shall notify the operator of the presence of gamma radiation sources, including SNM and RDD sources, when the system and the source are moving in relation to each other.

At a constant relative speed of 0.61 m/s demonstrate a PD of 80% or more, when exposed to Co-57 shielded by 5mm of steel producing 4.54 ± 10% 122 keV photons/cm2-second at point of closest approach of 170 centimeters (cm) and separately to Ba-133 shielded by 5mm of steel producing 2.42 ± 10% 356 keV photons/cm2-second at point of closest approach of 330 cm, based on a background of

7.5 μR/hr. Background exposure rate was measured with a GE RS

PIC.

At a constant relative speed of 1.50 m/s demonstrate a PD of 80% or more, when exposed to Co-57 shielded by 5mm of steel producing 4.54 ± 10% 122 keV photons/cm2-second at point of closest approach of 170 cm and separately to Ba- 133 shielded by 5mm of steel producing 2.42 ± 10% 356 keV photons/cm2-second at point of closest approach of 330 cm, based on a background of 7.5 μR/hr.

Background exposure rate was measured with a GE RS PIC.

Desired performance characteristics are the ability to detect the smallest amount of R/N material, with the most shielding, at the greatest distance and relative speed, while maintaining a low probability of false alarms.

The alarm signal threshold settings must be the same as those used for the false alarm tests, and device orientation must be as used in standard operations (on the belt for detection). For testing, the flux to be detected will be scaled as the square root of the ratio of the current test site background exposure rate to the background exposure rate on which the requirement was based.

Scaling of the specified flux conditions for evaluation purposes will be done using a device more appropriate than the GE RS High Pressure Ionization Chamber (HPIC).

Radiation background

Requires 3rd party independent testing at a minimum to substantiate claim of “meets.”

Objective measurement corresponding to that originally reported by the HPIC are a 2 x 2 inch NaI scintillator with reported energy range of 25 keV to 3 MeV. The background will vary between 0.34 μR/hr to 25 μR/hr. Distance and speed both must be scaled with the square root of the ratio of the target activity to the

OR-2

Key Performance Requirement

(KPP)

(continued)

The system shall notify the operator of the presence of gamma radiation sources, including SNM and RDD sources, when the system and the source are moving in relation to each other.

actual activity of the test source used. An energy calibrated HPGe detector is used to measure and determine the counts in the appropriate region of interest and then determine the flux at the point where the PRDs’ reference points will be placed.

FR-02-01 The device's alarm threshold shall be unaffected by slowly increasing radiation levels due to approaching a source.

In accordance with ANSI Standard N42.32-2006, Section 6.5.

Objective = Threshold It is possible and acceptable for the device to alarm before reaching the target test position.

OR-3

Performance Parameter

(KPP)

The system shall notify the operator of the presence of neutron radiation sources, including Weapons Grade Plutonium (WGPu).

In accordance with Section 6.3 of ANSI N42.32-2016.

Objective = Threshold Desired performance characteristics are the ability to detect the smallest amount of R/N material, with the most shielding, at the greatest distance, while maintaining a low probability of false alarms. The alarm signal threshold settings must be the same as those used for the false alarm tests, and device orientation must be as used in standard operations (on the belt for detection).

Requires 3rd party independent testing at a

FR-03-01

The neutron detector shall be insensitive to photon radiation.

In accordance with ANSI N42.32-2006, Section 6.9 The instrument shall not indicate the presence of neutrons when exposed up to a 10 mR/h field of Cs-137.

Objective = Threshold For maritime variant only.

OR-4

Key Performance Parameter

(KPP)

The system shall alert operator when exceeding a permissible exposure rate or dose rate.

Provide a unique visual, audible, and vibration notification to the operator that the exposure rate or dose rate has exceeded a user settable limit.

Objective = Threshold This alarm is unique and separate to the detection alarm specified in ORs 1, 2, and 3. PRDs are not personal protection equipment, but do provide information to operators concerning radiation exposure/dose rates upon which the operator can take personal protection actions.

Requires 3rd party independent testing at a

FR-04-01

The device shall accurately displayed exposure rates.

Displayed exposure rates within +/-30% of the conventionally true value of the applied exposure rate using Cs-137 per ANSI 42.32-2006, Section 6.6

Displayed exposure rates within +/-30% of the conventionally true value of the applied exposure rate across the applicable photon energy range of the device (e.g. use Am- 241 and Co-60 in addition to Cs-137).

Available Test Data

FR-04-02 The device shall indicate exposure rates over an operationally relevant range.

0μR/h - 5mR/h 0μR/h - 25mR/h

FR-04-03 The device shall provide an exposure rate over-range indication.

When exposed to radiation fields that are greater than the maximum designed exposure rate, the indication of the instrument is to remain at the maximum of that range and a separate over-range indication is to be displayed for the duration of the over-range exposure.

Objective = Threshold

FR-04-04 The device shall rapidly recover and respond normally following over range exposures.

In accordance with ANSI N42.32-2006, Section

6.8. Recover within 1

minute following exposure to 2 times the maximum design exposure rate.

Recover within 15 seconds following exposure to 2 times the maximum design exposure rate.

FR-04-05

The device shall directly display measured exposure/dose rate in manner appropriate for CONOPs based on exposure rate readings.

Directly display the measured exposure/dose rate (e.g., μR/h, μrem/h, μGy/h, μSv/h).

Provide option to change display to a numerical value that is proportional to the exposure or dose rate, but not explicitly report as the exposure or dose rate (e.g., display numerical range of 0-9)

OR-5 The system shall support the operator in localizing a radiation source.

Assist operator in determining if radiation level is rising or falling in real time.

Provide an indication that the radiation level is rising or falling in real time.

FR-05-01 The device shall provide an indication of increasing and decreasing gamma-ray intensities.

The device shall provide a visual or audible indication of increasing and decreasing gamma-ray exposure intensities.

The device shall provide a visual and audible indication of increasing and decreasing gamma-ray exposure intensities.

Intent is to aide with localization. Audible indication is operator-settable for covert environments.

OR-6 The system shall have a low gamma false alarm rate.

In a stable background environment (0.1 to 25 uR/hr), when operated with no radiation source present, no more than 1 gamma detection notification during 10 hours of continuous operation.

Objective = Threshold

OR-7 The system shall have a low neutron false alarm rate.

In a stable background environment (0.002-0.013 neutrons/cm2-second), when operated with no source present no more than 1 neutron detection notification during 10 hours of continuous operation.

Objective = Threshold

Available Test Data

OR-8 The system shall operate in a wide range of radiation background conditions.

Maintain functionality and the low false alarm rate of OR 6 & 7 and the ability to detect the limits specified in ORs 1 & 2 in gamma radiation backgrounds from 0.1 uR/hr-25uR/hr and neutron backgrounds from 0.002-0.013 neutrons/cm2-second.

Objective = Threshold

FR-08-01 The device shall allow gamma background updates to be performed automatically.

Device automatically updates gamma background upon start-up.

Device automatically updates gamma background during operation when background changes enough to affect detection performance

Intent is to minimize detection alarms on background variations.

FR-08-02 The device shall allow gamma background updates to be performed manually by the user.

User able to manually update the gamma background being used by the device.

Objective = Threshold Intent is to minimize detection alarms on background variations.

FR-08-03 , The device shall allow neutron background updates to be performed automatically.

Device automatically updates neutron background upon start-up.

Device automatically updates gamma background during operation when background changes enough to affect detection performance

FR-08-04 The device shall allow neutron background updates to be performed manually by the user.

User able to manually update the neutron background being used by the device.

OR-9 The system shall be able to maintain detection sensitivity without additional false alarms when exposed to background changes that occur during use.

N/A Objective only Maintain the low false alarm rate of ORs 6 & 7 and the ability to detect the limits specified in ORs 2 & 3 when Background changes by + 3 times the starting background in < 2 sec.

OR-10 The system shall have the ability to suppress alerts to the operator for elevated radiation due to only Naturally Occurring Radioactive Materials (NORM).

N/A - Objective only Does not alert operator when NORM is present in quantities that would otherwise invoke an alarm, yet it maintains the ability to detect the limits specified in OR-1 and OR-2.

Available Test Data

OR-12 The system shall have a high Operational Availability (Ao).

Ao is greater than or equal to 0.99

Ao is greater than or equal to 0.995

Ao= Mean Up Time/(Mean Up Time + Mean Down Time). Up time is defined as the amount of time that the system is operating or capable of operating.

Down time is defined as the amount of time that the system is not capable of being operated for any reason, such as breakage, being out for repair, or the logistics associated with the repair.

OR-13 The system shall perform reliably

Mean time between failure (MTBF) of 35,040 hours

MTBF of 70,080 hours Mean-time-between-failure (MTBF) is defined for a particular interval, as the total operating time (time that the system is operating or capable of operating) of the population of PRDs divided by the total number of failures (requiring corrective maintenance actions).

OR-14 The system shall operate without scheduled maintenance.

No maintenance exceeding charging and changing of batteries, non-invasive cleaning, and system operational checks and these require no special training or tools.

Objective = Threshold System operational checks are the actions necessary to ensure the system is in a fully functional condition and ready to perform operations. Functional checks as defined in ANSI N 42.32-2006 are "frequently used qualitative check to determine that an instrument is operational and capable of performing its intended function" (e.g., sufficient battery life, detector present and working, memory (if included) available, mode of operation). Any operational checks that require radioactive sources must use commonly available exempt quantity radioactive sources. OR 21 specifies that the user interface provide the indications necessary for operational checks.

Available Test Data

FR-14-01 The device shall employ self-checks and diagnostics that will inform operator of system problems.

Display self-check results upon start-up and operator command. Any self-check problem initiates an error notification to the operator.

Conduct periodic self-checks.

Self-checks and diagnostics to include ability to self-stabilize (e.g., stabilize detector gain based on temperature), monitor functionality, and diagnose malfunctions without operator interaction.

FR-14-02 The device shall maintain a maintenance status file.

Record maintenance status and notice of malfunctions in data file.

Objective = Threshold Minimum required data to be stored: date and time, on/off state, threshold settings and when changed, state of health and operating hours. At a minimum, maintenance state data should be logged when the state changes.

OR-15 The system shall operate for extended periods without recharging/replacing the device’s power supply.

168 hours (1 week) of continuous operation in a non-alarm state (in accordance with ANSI N42.32-2006 section 5.15).

8760 hours (1 year) of continuous operation in a non-alarm state.

Continuous operations are defined as turning on the system, allowing it to become fully functional and stabilize, then remain powered on and functional for the duration of the defined period subject to the standard test conditions defined in ANSI 42.32-2006 and test procedures in ANSI 42.32-2006 section 5.15.

Suitable battery life beyond the threshold is based on if the batteries are rechargeable or replaceable.

Rechargeable batteries acceptability must consider allow for a shorter operating period between charges, time to recharge and number of recharge cycles before degradation. Whereas replaceable batteries may increase lifecycle cost due to maintaining an operational supply of spares. So a longer battery life for replaceable batteries operating period is desired. Even if a device uses rechargeable batteries, it should accept common, commercial batteries in case charge is lost and recharge capability is unavailable or untimely.

Available Test Data

FR-15-01 The batteries shall be capable of powering the audible alarm continuously for 30 min.

The batteries shall be capable of powering the audible alarm continuously for 30 min.

Objective = Threshold

FR-15-02 Batteries shall be replaceable in the field without the use of special tools.

Batteries shall be replaceable in the field without the use of special tools.

Batteries shall be replaceable in the field without the use of any tools.

Reference ANSI Standard N42.32-2006, Section 5.15.Special tools are tools not readily available or found in a standard tool kit (e.g., of standard tools are pliers, cross point or flathead screw drivers).

FR-15-03 The device shall notify the operator of battery status.

Display remaining battery charge and Low battery alert.

Objective = Threshold

FR-15-04 Rechargeable batteries shall have an operationally acceptable charge time.

Fully charged within 3 hours.

Fully charged within 1 hour.

FR15-05 Replaceable batteries shall be type that are commonly available.

Device uses batteries that are commonly and commercially available, non-proprietary and not exclusive to that detector.

Objective = Threshold

OR-16 The system shall be ruggedized.

Function after subjected to the vibration, drop and impact environments specified in ANSI N42.32- 2006 Section 9.

Objective = Threshold System is to be tested in its fielded and carried/worn configuration.

OR-17

Performance Parameter

(KPP)

The system shall degradation in all operational environments, including indoor, outdoor, and maritime (all-weather) conditions.

In accordance with ANSI N42. 32-2006 sections 7 (Environmental Performance);

Temperature (7.1), Temperature Shock (7.2), Relative Humidity (7.3), Moisture and Dust Protection (7.4), and Cold Temperature Startup (7.5) and In accordance with MIL- STD-810G, Table C-I, and Part Two,509 for Salt Fog, with the following updates: the required lower temperature limit is minus 30 degrees C and the moisture and dust protection level is IEC IP- 65.

In addition to threshold the lower temperature limit is minus -40 degrees Celsius.

Requires 3rd party independent testing at a

OR-18 The system shall degradation in a radiofrequency electromagnetic environment.

In accordance with ANSI N42.32-2006, Section 8, Electromagnetic Performance Requirements.

Objective = Threshold

OR-19 The system shall be safe to operate.

Pass Underwriters Laboratories (UL) Certification 61010-1V3 certification or equivalent.

In addition to threshold, be intrinsically safe in accordance with UL- 913 7th Edition.

Available Test Data

OR -20 The system shall be capable of being worn by operators as standard equipment.

Not to interfere with the operator’s movement or activities while conducting routine duties.

Objective = Threshold PRDs are pocket sized and worn on the body as part of and with standard mission equipment. They may be worn on/attached to the front of the uniform OR duty belt OR MOLLE® type webbing on issued body armor depending on operational environment. The operator shall be able to get in and out of vehicles without the device being hung up or inadvertently removed from the operator.

OR-20a The device shall be small.

The length of the device shall be equal to or less

The length of the device shall be equal to cm.

Dimensions are based on the device only and does not include the carrying pouch or any form of belt clips or lanyards. Device meeting this length requirement must also have the dimensions of width and depth, when multiplied by the length that do not exceed the volume requirement of OR-20b.

OR-20b The device shall have a small volume

The volume of the device shall not exceed 200 cm3.

The volume of the device shall not excceed150 cm3.

Volume is based on the device only and does not include the carrying pouch or any form of belt clips or lanyards.

OR-20c The device shall be lightweight.

Mass of the device not to exceed 200 grams.

Additional holster, case, or removable clip shall not exceed 40 grams.

Mass of the device not to exceed 170 grams.

Additional holster case, or removable clip shall not exceed 40 grams.

Weight of device is with or without neutron detection and includes batteries, but does not include attachment devices such as clips, holster, or case. Methods for attaching the device to operator’s equipment is constrained to a maximum of 40 grams.

FR-20-01 The device shall be attachable to operators' standard equipment

The device shall include a means to securely fix the device to the operator, with attention given to the necessary orientation of the detector and display.

Objective = Threshold Device holster/case type accessories should be able to be secured to both the MOLLE® type webbing on issued body armor as well as the duty belt depending on operational environment.

FR-20-02 The device shall have a reference point.

The device shall have a reference point and indicate its orientation with respect to the operator.

Objective = Threshold Clearly indicate proper orientation for wearing and when localizing (holding in hand). The presence of a clip may be used as the reference point to indicate proper orientation.

Available Test Data

FR-20-03 The device shall be capable of one-handed removal and replacement from operator's equipment or uniform.

The device shall be capable of one-handed removal and replacement from operator's equipment or uniform.

Objective = Threshold

OR - 21 The system shall provide notifications to operator in a covert and overt manner.

Selectable between visual, tactile and audible.

In addition to threshold, permits use of headphones.

FR-21-01 The device shall have a visual display.

In accordance with ANSI 42.32-2006, Section 5.7.

Over the entire temperature range, easily readable under different light conditions from low light (<150 lux) to intense light (>10000 lux).

Objective = Threshold

FR-21-02 The device shall provide an audible detection alarm to indicate an increase in the radiation level that is greater than the alarm set point and for maintenance/battery alerts.

In accordance with ANSI N42.32-2006, Section

5.8. A-weighted sound

level at a distance of 30 cm shall be at least 85 dB(A).

Objective = Threshold

FR-21-03 The device shall have a vibration alarm signal capability to indicate an increase in the radiation level that is greater than the alarm set point and for maintenance/battery alerts.

In accordance with ANSI N42.32-2008, Section

5.9. The vibration shall

have sufficient intensity to inform the operator of an alarm condition. The intensity shall be greater than 0.8g.

Objective = Threshold

FR-21-04 It shall not be possible to disable all indications simultaneously.

At least one of the indication modes (visual, audible, vibration) must be enabled at all times.

OR-22 The system shall provide user interfaces for both operational and maintenance functionalities.

Provides information pertaining to level of gamma radiation, presence of neutrons (maritime variant), device functionality, and battery status to the operator.

Objective = Threshold

FR-22-01 The device shall include controls that are user-friendly for routine operation.

Controls clearly identified, easily operable under conditions of expected use, including while wearing gloves.

Objective = Threshold

FR 22-02 The device shall include controls that preclude accidental operation.

In accordance with ANSI N42.32-2006, Section

5.1. Controls adequately

protected from inadvertent operation/engagement.

Available Test Data

FR-22-03 The device shall directly display the operational relevant data.

1. Indication of exposure rate of gamma radiation with the associated radiological unit.

2. Count rate of neutron radiation (where applicable) with associated unit, e.g., cps (counts per second) or cpm (counts per minute).

3. Indication of alarm state

4. Maintenance/ operational status

5. Visible indicator of remaining battery life.

6. Over range indication

Objective = Threshold

FR-22-04 The device displays shall be readable by users wearing polarized sunglasses.

During outdoor daylight conditions through polarized sunglasses.

Objective = Threshold

OR-23 The system shall be easy to operate.

60% of operators completing all detector operations (Table 3) report the system is easy to use.

90% of operators completing all detector operations (Table 3) report the system is easy to use.

This requirement addresses the self-perceived ease by which the operator interacts with the system (user interface, buttonology, and the interpretation of outputs) Table 3 lists the system user tasks as:

Place the system into operation, set user adjustable features, monitor system status, recognize and understand system notifications, localize a source of radiation, turn off the system, conduct basic operator maintenance.

OR-24 The system shall be operable by a user with minimal training

With no more than 60 minutes of training, operator is able to complete all detector operations (Table 3).

With no more than 30 minutes of training, operator is able to complete all detector operations (Table 3).

Table 3 includes:

Operator able to place system in operation, set user adjustable features, monitor system status, recognize and understand notifications, localize a source of radiation, turn system off, conduct basic maintenance.