Radiometric measurements on the fabrication of non-destructive assay standards for WIPP-Performance Demonstration Program Page: 6 of 17
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the 59.5-keV 241Am peak were accumulated for sufficient time to obtain counting statistics error
of < 0.5 %. The homogeneity of each PuOr2DE blend mixture was estimated from the
consistency of the six samples at 59.5 keV 241Am peak area per unit mass of the sample.
Preparation of WRM After three mass ranges of the blends were proven to be
homogeneous and met the uniformity quality objective, the blend for each WRM was prepared
individually. While loading the PuOr2DE blend into the stainless steel cylinder for each WRM,
extra care was taken to minimize the loss and spillage of the blend mixture. Prior to loading each
WRM, the glovebox was wiped down with a damped cloth to prevent cross contamination from
the dusting of each PuO2-DE mixture. A clean brown paper (30 x 30 cm) was placed on the
glovebox surface while packing the blend into the cylinder. Any spills of the blend mixture were
added back into the cylinder. All the paper tissues, cotton tips, and paper funnel used during the
blending and transferring operations were placed inside of the emptied blending bottle. These
materials became the waste item for each WRM.
Waste Item Measurement. The amount of the PuOr2DE mixture left in the waste item for
each WRM was determined by a fixed geometry non-destructive gamma-ray analysis. Since the
concentration of 24'Am in the PuO2 sample was accurately determined by both mass spectrometry
and radiochemistry, the amount of PuO2 left in the waste item was determined via the
measurements of "Am gamma rays at 59.5 keV.
A standard was prepared closely matching the waste items. This standard item included a
clean blending bottle, a clean brown paper, cotton tips, paper funnel, and paper tissues. Four
pieces of cloth swipes spiked with the NIST traceable 241Am standardized solution were taped
symmetrically around inside of this standard blending bottle. The waste item standard contained4
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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/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.