Administrative Procurement Branch, Environmental Protection Agency, Fairchild Building -- 7th Floor, 499 S. Capital Street, S.W., Washington, DC 20024

66 -- HIGH PURITY GERMANIUM DETECTOR IN A ULTRA LOW LEVEL BACKGROUND CONFIGURATION WITH A LOW BACKGROUND LEAD SHIELD SOL 97-4 DUE 072597 POC Rodney P. Magee, Contracting Officer, (202)260-6455 E-MAIL: Rodney Magee, Contracting Officer, Magee.Rodney@epamail.epa.gov. The Environmental Protection Agency has a requirement for a High Purity Germanium Dectector in a ultra low level background configuration with a low background lead shield. This Dectector must meet the following specification: 1). The Guaranteed Relative Efficiency must be greater than 80%; 2). The Detectable Energy Range must be 40 keV to 10 MeV; 3). The Guaranteed Resolution must be less than or equal to 2.1 keV FWHM @ 1.332MeV and/or less than or equal to 1.2 keV FWHM @122keV. No Prototypes will be acceptable for this procurement. The Detector for this instrument will be a High Purity Coaxial. The contacts are diffused lithium and implanted boron. The End Cap for this instrument shall be designed to ensure high geometric efficiency and made from 99.999% pure aluminum. The Uranium and Thorium composition contains less than one part per billion. he end cap will be constructed seamless to ensure long reliabilit vacuum integrity. The end cap will allow for depth of Marinelli configurations with no interferences. The end cap will not exceed 3.75 inches in diameter. The Vacuum Chamber will be fabricated from 99.99% pure copper. The Detector mount cup and components should be constructed of high purity copper. Detector to entrance window distance should be nominally set to 3mm. The preamplifier on the J-type and U-style Cryostat will be remotely located for a ultra low background configuration. The Dewar must have a Liquid Nitrogen (LN2) capacity of 30-32 liters with a loss rate of approximately 0.5-0.6 liters per day. Setyup for J-type or U-Style integration with preamplifier mounted for ultra low level background configuration. The lead shielding for this instrument must be between four to six inches thick. The support stand or table for this instrument must be pre-manufactured. All items listed for this instrument must have a minimum of one year return to factory warranty. Delivery Date of these items is guaranteed to be no more than 90 days from ordering. Simplified Acquisition Procedures will be utilized in selecting qualified vendors. Written inquireis may be utilized via facsimile to (202)260-6455 or via E-mail to Magee.Rodney @epamail.epa.gov. (0184)

Loren Data Corp. http://www.ld.com (SYN# 0449 19970708\66-0024.SOL)