Administrative Contract Service Center; 1300 Pennsylvania Avenue, = NW; Ronald Reagan Building; Washington, DC 20004

66 -- EXTENDED ENERGY GERMANIUM DETECTOR SOL 97-8 POC Rodney P. Magee, Contracting Officer, (202) 564-4793 E-MAIL: Rodney P. Magee, Contracting Officer, Magee.Rodney=40epamail.epa..gov. The Environmental Protection Agency has a requirement for an = Extended Range Germanium Detector. The machine must conform to the = following physical specifications: The detector shall be a *P* Type = intrinsic germanium detector and shall be furnished in a portable, = multi-attitude cryostat with liquid nitrogen capacity of 7.0 liters and = nominal holding time of 4-5 days. The detector shall be mounted on a top = plate as specified in a drawing (drawing to be provided by EPA) for the = purpose of compatible attachment to the existing EPA tripods. The = detector housing must have a thin, low atomic number (lo-Z) window which = does not present significant attenuation to photons of energies 30 = kiloelectron volts (keV) and above. (The detector must be able to = quantitatively measure photons as low as 22 keV.) The machine must = conform to the following performance specifications: The detector must be = 100% or better efficient relative to a 3=22 x 3=22 sodium iodide at a = photon energy of 1332 keV (Cobalt-60 energy). The Full Width at Half = Maximum (FWHM) must be less than or equal to 2.0 keV at photon energy of = 1332 keV and less than 1.0 keV at photon energy of 22 keV. The ration of = Full Width at Tenth Maximum (FWTM) to FWHM must be less than or equal to = 2:1 throughout the useful energy range. The peak to Compton ration shall = be greater than or equal to 85:1 for 1332 keV photons and greater than or = equal to 20:1 for photons in the range of 22-88 keV. The calibrations = that must be provided with the detector are the following: All calibrations= shall be provided in both hard copy (documentation) and as files on = floppy disk which can be readily transferred to the system hard disk and = directly accessed by the preexisting EPA spectroscopy software (Canberra = Industries InSpector system/Genie-PC software). In particular, all = calibration files must be directly accessible and usable by the preprogramm= ed batch counting procedures utilized in Genie-2 ProCount. Al calibrations= required shall be performed by the supplier using the specific detector = supplied (use of a *model* or *standard* detector is unacceptable). For = calibrations which are computed (such as through use of Monte Carlo = computer techniques, documentation must be submitted which substantiates = that actual physical properties of the specific detector and its housing, = as measured during its manufacture were incorporated into the computations.= Computed calibration documentation must include the accuracy, detector = to soil spacing and radionuclide depth distributions for which such = calibrations are valid, as well as evidence (such as quality assurance = documentation) that the software used to perform these computations has = been adequately verified and validated for application to in-situ gamma in = soil modeling. The required calibrations for the detector are as follows: = Two calibrations are required for point source geometry: One meter from = the detector sensitive volume on axis and one meter from the detector at= 90 degrees to the axis. Forty calibrations are required for radionuclides = exponentially distributed with depth in soil: for relaxation mass = (vertical relaxation length times soil density) values of 0.1, 0.3, 1.0, = 3.0, 10.0, 30.0, 100.0 and infinity (grams/cm2) calibrate for detector to = soil distances (in-situ counting) of 0.3,1.0,2.0,3.0, and 10 meters. = Documentation shall be provided which demonstrates that system measurement = accuracy lies within the range+10% to -10% over the energy range 46 keV to = 3000 keV. A soil counting library containing nuclides naturally occurring = in soil as well as man made nuclides typically associated with contaminatio= n from nuclear fuel cycle/nuclear weapons activities shall be supplied = with the detector. The library must be compatible with current EPA = spectroscopy software. The support services that are required to be = provided with the detector are as follows: The supplier shall install and = mount the detector, install and test the calibration software for proper = function, verify correct quantitative measurements, set up and install = preprogrammed batch counting procedures with routines optimized for = in-situ soil counting and instruct EPA staff in the operation of all = equipment and software. All support services must be performed at the EPA = facility in Las Vegas. This procurement has been designated a Small = Business Set-Aside. The Standard Industrial Code (SIC) for this procurement= is 3821. Simplified Acquisition Procedures will be utilized for the = determination of qualified bidders. All inquiries as to the technical = drawings and/or this announcement shall be addressed to Rodney Magee at = (202) 564-4793 and/or E-mail Magee.Rodney=40epamail.epa.gov. =09 (0233)

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