Scionix Scintillation Detector

THIS IS A NOTICE OF INTENT TO AWARD A SOLE SOURCE CONTRACT AND IS NOT A REQUEST FOR

COMPETITIVE QUOTES.

The USDA/ARS intends to award a Firm fixed price sole source contract under the authority of 41 U.S.C 253(c)(1) and FAR 6.302-1(a)(2), only one responsible source, to:

Berkeley Nucleonics Corp

2955 Kerner Blvd

San Rafael, California 94901

Specifications

V127A152/5M-HV-Q-X

Description: Large volume Nal(TI) detector with built-in high voltage power supply and special connector

Scintillation crystal:                                         Nal*TI), 127 x 127 x 152 mm

Design drawing:                                                VS-548-10

Housing:                                                              1.0 mm thick stainless steel

Optical window:                                               Quartz, 12.7 mm thick

Photomultiplier tube:                                     127 mm diameter, ET 9390

Internal high voltage generator:                Corkcroft Walton type PS1822/5

High voltage regulation:                                By means of external control voltage via white Wire (pin 4 of MOLEX connector)

Internal HV supply HV control:                    accessible via hole in backcap

HV test point voltage:                                    1V = 1kV

Temperature sensitivity:                               Cathode-to-anode voltage changes: < 0.03, 0.01 typical (+20 degrees Celsius to 50 degrees Celsius)

Warm-up time:                                                 0.3% of final output after 10 s. 0.02% of final output after 10 min.

High voltage discharge time:                       < 60 s to < 30 V

Line regulation:                                                 0.005% per volt power supply voltage

Gain stability:                                                     < 1% up to 20 uA anode current

Power requirements:                                     +5 V, power requirement 100 mW

Electrical Connections:                                  Negative high voltage circuit (anode at ground potential). Readout at anode of PMT

45 cm long flying leads cables through two openings in backcap of detector to MOLEX connector type

90156-0146 WM 8021-ND (Farnell)

Function                                                              Cable colour                                       Pin number

+5V input Voltage                                            Red                                                        1

Common ground                                              Black                                                      2

High Voltage control (INT)                            Yellow                                                   3

Control Voltage                                                White                                                    4

Anode output                                                    Coax RG 174 core                             5

Signal ground                                                    Coax RG 174 braid                            6

Performance criteria

Energy resolution (662 keV)                        <             8.52 % FWHM

Note:                  The High voltage should be chosen as large as possible given the required dynamic

range. This ensures the optimum signal-to-noise ratio.

Ship To:

USDA, ARS, SDRU

411 S. Donahue Drive

Auburn, AL 36832

The NAICS code for this requirement is 334516; the small business size standard is 1000 employees.

This notice of intent is not a request for competitive quotes; however, interested persons may identify their interest and capability to respond to this requirement. All information received by 3:00 PM Central Time on March 9, 2020, will be considered by the Government. Responses shall be submitted to Lynn Hults at lynn.hults@usda.gov.

The e-mail subject line shall state: 12405B19P-993893 Notice of Intent to Sole Source. A determination by the Government not to compete this proposed contract based on responses to this notice is solely within the discretion of the Government.

NO TELEPHONE REQUESTS WILL BE HONORED.