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Title: Re-measured uranium branching ratios and their impact on removing biases from MGAU analyses

Abstract

Biases in MGAU analyses first observed in FSU Gosatomnadzor inspection and subsequently identified in more detail by measurements at the Moscow Kurchatov Institute have forced a new look at the code's analysis assumptions. We have used uranium gamma-ray calibration standards from the National Bureau of Standards and standards from the New Brunswick Laboratory to investigate MGAU analysis biases. The 200g uranium standards which cover the uranium enrichments ranging from 0.3% to 93% were used to collect more than 500 gamma-ray spectra for this study. The experimental arrangement used a LEPS Ge detector with various source-detector configurations and absorbers. Two independent versions of the MGAU code, which we currently employ in our laboratory, confirm the biases noted in a developing variety of FSU inspection results and in the careful Kurchatov study. In this paper, we will discuss the MGAU methodology and use 250 spectra at a fixed geometry without absorbers to obtain new branching ratios for the critical 100-keV region gamma rays. We show that modifying the branching ratios removes a significant component of the observed biases.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
14672
Report Number(s):
UCRL-JC-135774; GD0604020
GD0604020; TRN: AH200129%%435
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 6th International Conference on Facility Operations, Safeguards Interface, Jackson Hole, WY (US), 09/20/1999--09/24/1999; Other Information: PBD: 17 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; BRANCHING RATIO; CALIBRATION STANDARDS; GEOMETRY; NEW BRUNSWICK; SAFEGUARDS; SPECTRA; URANIUM; US NBS

Citation Formats

Lanier, R G, Ruhter, W D, and Wang, T F. Re-measured uranium branching ratios and their impact on removing biases from MGAU analyses. United States: N. p., 1999. Web.
Lanier, R G, Ruhter, W D, & Wang, T F. Re-measured uranium branching ratios and their impact on removing biases from MGAU analyses. United States.
Lanier, R G, Ruhter, W D, and Wang, T F. Fri . "Re-measured uranium branching ratios and their impact on removing biases from MGAU analyses". United States. https://www.osti.gov/servlets/purl/14672.
@article{osti_14672,
title = {Re-measured uranium branching ratios and their impact on removing biases from MGAU analyses},
author = {Lanier, R G and Ruhter, W D and Wang, T F},
abstractNote = {Biases in MGAU analyses first observed in FSU Gosatomnadzor inspection and subsequently identified in more detail by measurements at the Moscow Kurchatov Institute have forced a new look at the code's analysis assumptions. We have used uranium gamma-ray calibration standards from the National Bureau of Standards and standards from the New Brunswick Laboratory to investigate MGAU analysis biases. The 200g uranium standards which cover the uranium enrichments ranging from 0.3% to 93% were used to collect more than 500 gamma-ray spectra for this study. The experimental arrangement used a LEPS Ge detector with various source-detector configurations and absorbers. Two independent versions of the MGAU code, which we currently employ in our laboratory, confirm the biases noted in a developing variety of FSU inspection results and in the careful Kurchatov study. In this paper, we will discuss the MGAU methodology and use 250 spectra at a fixed geometry without absorbers to obtain new branching ratios for the critical 100-keV region gamma rays. We show that modifying the branching ratios removes a significant component of the observed biases.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

Conference:
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