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Title: Assay of contained waste using active and passive computed tomography

Abstract

The US Department of Energy (DOE) has more than 600,000 transuranic waste drums temporarily stored at nearly 40 sites within the US. Contents of these drums must be characterized before they are transported for permanent disposal. Opening drums for examination is expensive mainly because of the safety precautions that must be taken. Current nonintrusive methods of characterizing waste in sealed drums are often inaccurate where assay errors are related to nonuniform measurement responses associated with unknown radioactive-source and waste-matrix-material distributions. These errors can be reduced by the application of imaging techniques that better measure the spatial locations of sources and matrix attenuation. Lawrence Livermore National Laboratory (LLNL) has developed an emerging gamma-ray nondestructive analysis (NDA) technology, called active and passive computed tomography (A and PCT), that identifies and accurately quantifies all detectable radioisotopes in closed containers of waste. The performance of the A and PCT technology has been determined by several open and blind tests. Several 15-replicate studies were completed for three of the four required activity ranges. The three ranges were measured by acquiring A and PCT data for three separate placements of radioactive standards within an empty-matrix drum. The standards had a total mass of 0.93, 9.3, andmore » 33.48 g of {sup 239}Pu positioned within the drum and required 4, 0.75, and 0.5 h total assay time per replicate, respectively. The performance results are summarized in Table 1. Additional research is being performed to maintain requirements while decreasing assay time.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
OSTI Identifier:
20005805
Resource Type:
Journal Article
Journal Name:
Transactions of the American Nuclear Society
Additional Journal Information:
Journal Volume: 81; Conference: American Nuclear Society 1999 Winter Meeting, Long Beach, CA (US), 11/14/1999--11/18/1999; Other Information: PBD: 1999; Journal ID: ISSN 0003-018X
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 40 CHEMISTRY; US DOE; ALPHA-BEARING WASTES; RADIOACTIVE WASTE STORAGE; RADIOACTIVE WASTE DISPOSAL; NONDESTRUCTIVE ANALYSIS; COMPUTERIZED TOMOGRAPHY; RADIOASSAY; GAMMA SPECTROMETERS

Citation Formats

Roberson, G P, Martz, H E, and Nisius, D T. Assay of contained waste using active and passive computed tomography. United States: N. p., 1999. Web.
Roberson, G P, Martz, H E, & Nisius, D T. Assay of contained waste using active and passive computed tomography. United States.
Roberson, G P, Martz, H E, and Nisius, D T. Thu . "Assay of contained waste using active and passive computed tomography". United States.
@article{osti_20005805,
title = {Assay of contained waste using active and passive computed tomography},
author = {Roberson, G P and Martz, H E and Nisius, D T},
abstractNote = {The US Department of Energy (DOE) has more than 600,000 transuranic waste drums temporarily stored at nearly 40 sites within the US. Contents of these drums must be characterized before they are transported for permanent disposal. Opening drums for examination is expensive mainly because of the safety precautions that must be taken. Current nonintrusive methods of characterizing waste in sealed drums are often inaccurate where assay errors are related to nonuniform measurement responses associated with unknown radioactive-source and waste-matrix-material distributions. These errors can be reduced by the application of imaging techniques that better measure the spatial locations of sources and matrix attenuation. Lawrence Livermore National Laboratory (LLNL) has developed an emerging gamma-ray nondestructive analysis (NDA) technology, called active and passive computed tomography (A and PCT), that identifies and accurately quantifies all detectable radioisotopes in closed containers of waste. The performance of the A and PCT technology has been determined by several open and blind tests. Several 15-replicate studies were completed for three of the four required activity ranges. The three ranges were measured by acquiring A and PCT data for three separate placements of radioactive standards within an empty-matrix drum. The standards had a total mass of 0.93, 9.3, and 33.48 g of {sup 239}Pu positioned within the drum and required 4, 0.75, and 0.5 h total assay time per replicate, respectively. The performance results are summarized in Table 1. Additional research is being performed to maintain requirements while decreasing assay time.},
doi = {},
url = {https://www.osti.gov/biblio/20005805}, journal = {Transactions of the American Nuclear Society},
issn = {0003-018X},
number = ,
volume = 81,
place = {United States},
year = {1999},
month = {7}
}