58 -- N"-TYPE, LOW ENERGY HPGE DETECTORS (4)

Notice Date

September 12, 2001

Contracting Office

Administrative Contracts Service Center (3803R), Environmental Protection Agency, Ronald Reagan Building -- 7th Floor, 1300 Pennsylvania Avenue, N.W., Washington, DC 20460

ZIP Code

20460

Solicitation Number

PR-DC-01-02976 (DCN EEE456)

Response Due

September 19, 2001

Point of Contact

Christopher T Smith (202) 564-0372

E-Mail Address

smith.christopher@epa.gov (smith.christopher@epa.gov)

Description

Four (4) "N"-type, Low Energy HpGe Detectors. The Contracting Officer considers this procurement an acquisition of commercial items. Therefore (see FAR 5.203(b)), the date and time for submission of quotes is hereby set as no later than Noon (12 p.m. local Washington, D.C. time) on Wednesday, September 19, 2001. Electronic copies in Word Perfect 9.0 and Lotus 1-2-3 9.5 compatible formats may be sent to "smith.christopher@epa.gov". Facsimile (fax) copies will also be accepted at (202) 565-2554 or -2562. Early submissions are encouraged. Specifications: 1. The detectors shall be a "N" type coaxial high purity intrinsic Germanium photon detector with an operable range of gamma detection of at least 5 to 3000 kilo-electron volts (keV). 2. The detectors shall have a relative efficiency of at least 60 percent. Relative efficiency measurement method shall be according to American National Standards Institute/Institute of Electrical and Electronics Engineers (ANSI/IEEE 325-1986). 3. The detectors shall have a resolution of 2.00 keV Full Width at Half Maximum (FWHM) or at least 1332 keV, and 1.00 keV or less at 5.9 keV. It shall also have a Full Width at Tenth Maximum to FWHM (FWTM/FWHM) ratio of less than or equal to 2.0 and a Full Width at Fiftieth Maximum to FWHM (FWTM/FWHM) ratio of less than or equal to 3.0. 4. The detectors shall have a 22 to 88 keV ratio (for Cadmium109) of 20:1 or greater. 5. The detectors shall have a peak to Compton ratio of 56:1 or greater, as determined by the ANSI/IEEE 325-1986 method on the 1332 keV Cobalt60 line. 6. The detectors shall be able to incorporate automatic shutdown circuitry interfaceable to standard Germanium (Ge) system high voltage power supplies with a single BNC type connection. 7. The detectors shall have an endcap diameter small enough to fit into the well of a Marinelli type beaker with a well diameter of 3.28 inches. 8. The detectors shall be supplied in a vertical "streamlined" configuration; that is, the preamplifier shall be housed behind the detector in a cylindrical configuration, and permanently mounted on a vertical cryostat, so as to fit inside a standard low background shield. 9. The detectors shal include a standard 30 liter "up-looking" croygenic dewar. 10. The detector (including all detector, endcap and cryostat components that will be inside the shield) will be made from low background materials. The contractor shall submit a low background measurement spectrum of at least 100,000 seconds duration for each detector prior to shipping. This spectrum shall contain no non-natural peaks, and natural peaks no greater (in counts per hour per peak) than listed in the following. High Purity Germanium Detector Background Peak Specifications. The detector shall have no greater than the following level of background peak total integrated counts per hour (cph) above the continum as follows (Energy (keV)//Nuclide//Peak cph): 63keV//Thorium-234//9cph. 186keV//Uranium235/Radium226//14cph. 239keV//Lead212//14cph. 295keV//Lead214/2cph. 338keV//Actinium228//3cph. 352keV//Lead214//7cph. 511keV//Annihilation Peak//135cph. 583keV//Thallium208//14cph. 609keV//Bismuth214//7cph. 911keV//Actinium228//3cph. 1001keV//Protactinium234m//5cph. 1120keV//Bismuth214//3cph. 1460keV//Potassium40//14cph. 1764keV//Bismuth214//5cph. 2614keV//Thallium208//7cph. See Note 23.

Web Link

smith.christopher@epa.gov (smith.christopher@epa.gov)

Record

Loren Data Corp. 20010914/58SOL003.HTM (W-255 SN50X3C4)