Radiometric measurements on the fabrication of non-destructive assay standards for WIPP-Performance Demonstration Program Page: 13 of 17
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239Pu Verification Measurements. Figure III shows a typical gamma-ray spectrum of the
WRM measurement. The 23Pu gamma ray peaks (129, 208, 375, and 414-keV) obtained from
the measurement were normalized with the mass of plutonium in each WRM. The purpose of
these measurements was to provide a verification of the Pu content in each WRM by comparing
the normalized count rate, counts per second per g of Pu (Table III).
TABLE III. The Normalized Pu Count Rate (counts per second per g of Pu) without the self-
attenuation correction.
WRM / Energy 129-keV 208-keV 375-keV 414-keV
20-40 mg Pu 55.03 1.70 32.88 0.83 14.82 0.53 12.05 0.49
200-400 mg Pu 53.28 0.72 32.46 0.69 14.40 0.18 11.65 0.21
2000-4000 mg Pu 50.26 0.89 32.16 0.25 14.51 0.21 11.81 0.11
FIGURE III. A Typical Gamma-Ray Spectrum of a WRM.
NDA PDP Pu Homogeneity Measurement
Working Reference Material
140
120 >
100 d1
o R
c 40 .
20 . n
0
0 50 100 150 200 250 300 350 400 450 500
Energy (keV)11
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Wong, A. S. & Marshall, R. S. Radiometric measurements on the fabrication of non-destructive assay standards for WIPP-Performance Demonstration Program, article, April 1, 1997; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc689857/m1/13/?rotate=0: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.