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Proceedings Paper

Performance evaluation of the passive active neutron (PAN) radioassay system at Idaho National Engineering Laboratory
Author(s): Yale D. Harker; Larry G. Blackwood; Woo Y. Yoon; Teresa R. Meachum
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Paper Abstract

The Idaho National Engineering Laboratory is using the passive active neutron (PAN) radioassay system to assay 208 liter drums for plutonium in transuranic waste. PAN systems similar to INEL's are in use to perform like tasks at other US DOE sites and later versions of the PAN are in use throughout the world. The PAN system, developed by Los Alamos National Laboratory, uses both passive neutron coincidence counting and thermal neutron interrogation/differential die-away to determine the amount of plutonium in a waste drum. This paper discusses a modified statistical sampling and verification approach to determine the total uncertainty of a PAN systems measurement when applied in the assay of real waste. In this approach a statistical review is performed on real waste drum radiographs, waste generator data and PAN assay data to identify the variations of the physical, chemical and measurement characteristics pertaining to a waste category. Using data from the statistical review, the performance of the PAN assay systems is simulated using computer models of the assay system with regard to the waste form under review. The simulated responses, in terms of plutonium mass in these cases, are compared with the known input masses to assess total uncertainty. To demonstrate the method, the result of this approach will be presented for PAN measurements on two waste categories at INEL.

Paper Details

Date Published: 27 February 1997
PDF: 4 pages
Proc. SPIE 2867, International Conference Neutrons in Research and Industry, (27 February 1997); doi: 10.1117/12.267898
Show Author Affiliations
Yale D. Harker, Idaho National Engineering Lab. (United States)
Larry G. Blackwood, Idaho National Engineering Lab. (United States)
Woo Y. Yoon, Idaho National Engineering Lab. (United States)
Teresa R. Meachum, Idaho National Engineering Lab. (United States)


Published in SPIE Proceedings Vol. 2867:
International Conference Neutrons in Research and Industry
George Vourvopoulos, Editor(s)

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