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Title: IGRIS for characterizing low-level radioactive waste

A recently developed neutron diagnostic probe system has the potential to noninvasively characterize low-level radioactive waste in bulk soil samples, containers such as 55-gallon barrels, and in pipes, valves, etc. The probe interrogates the target with a low-intensity beam of 14-MeV neutrons produced from the deuterium-tritium reaction in a specially designed sealed-tube neutron-generator (STNG) that incorporates an alpha detector to detect the alpha particle associated with each neutron. These neutrons interact with the nuclei in the target to produce inelastic-, capture-, and decay-gamma rays that are detected by gamma-ray detectors. Time-of-flight methods are used to separate the inelastic-gamma rays from other gamma rays and to determine the origin of each inelastic-gamma ray in three dimensions through Inelastic-Gamma Ray Imaging and Spectroscopy (IGRIS). The capture-gamma ray spectrum is measured simultaneously with the IGRIS measurements. The decay-gamma ray spectrum is measured with the STNG turned off. Laboratory proof-of-concept measurements were used to design prototype systems for Bulk Soil Assay, Barrel Inspection, and Decontamination and Decommissioning and to predict their minimum detectable levels for heavy toxic metals (As, Hg, Cr, Zn, Pb, Ni, and Cd), uranium and transuranics, gamma-ray emitters, and elements such as chlorine, which is found in PCBs and other pollutants.more » These systems are expected to be complementary and synergistic with other technologies used to characterize low-level radioactive waste.« less
Authors:
 [1] ;  [2]
  1. Nuclear Diagnostic Systems, Springfield, VA (United States)
  2. Concord Associates, Knoxville, TN (United States)
Publication Date:
OSTI Identifier:
343724
Report Number(s):
CONF-921137--PROC.
ON: DE98050439; TRN: IM9921%%188
Resource Type:
Conference
Resource Relation:
Conference: 14. annual DOE low-level radioactive waste management conference, Phoenix, AZ (United States), 18-20 Nov 1992; Other Information: PBD: Mar 1993; Related Information: Is Part Of Fourteenth annual U.S. Department of Energy low-level radioactive waste management conference: Proceedings; PB: 651 p.
Research Org:
EG and G Idaho, Inc., Idaho Falls, ID (United States). National Low-Level Waste Management Program
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; 05 NUCLEAR FUELS; LOW-LEVEL RADIOACTIVE WASTES; NONDESTRUCTIVE ANALYSIS; SOILS; CONTAINERS; GAMMA DETECTION; GAMMA SPECTROSCOPY; METALS; RADIOISOTOPES; MULTI-ELEMENT ANALYSIS