A portable, photon analysis spectrometer for the assay of X- and gamma-ray emitting radionuclides |
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Authors: | R J Gehrke E W Killian L V East J M Hoggan S G Goodwin G D McLaughlin |
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Institution: | (1) Idaho National Engineering and Environmental Laboratory, Lockheed Martin Idaho Technologies Company, 83415-2114 Idaho Falls, ID, USA |
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Abstract: | A portable, battery-powered, multichannel analyzer (MCA) for use with Ge spectrometers has been developed for in-field use
for the assay of x-and γ-ray emitting radionuclides. The spectrometer is capable of operating to rates greater than 150,000
counts per second. The analyzer is a Canberra InSpector MCA, that is equipped with the INEEL ultra-stable dual-energy pulser,
and pulse injection with subsequent removal (PISR) circuitry. PCGAP, a set of MCA control and spectral analysis programs,
was developed for use on a PC with a Windows NT Operating System. It includes an interactive peak analysis program as well
as automatic spectral analysis programs for the X- and γ-ray regions, and a number of utility programs. The pulser peaks are
calibrated with radioactive sources in terms of energy (i.e., their energy equivalents are measured) using the PCGAP spectral
analysis package so that energy shifts, including those due to changes in temperature or count rate, do not cause a loss of
energy calibration. The number of injected low- and high-energy-equivalent pulses is known so the stored pulser pulses can
be used for a dead-time and random summing correction. The pulser peaks are also used to monitor any deterioration in spectral
quality caused by noise, ground loops, etc. The results of performance tests to demonstrate the capabilities of this pulser-equipped
InSpector are reported. |
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