A minimum biased shell-source method for the calibration of rad waste assay systems

M. Bruggeman; J. Gerits; R. Carchon

doi:10.1016/S0969-8043(99)00041-X

A minimum biased shell-source method for the calibration of rad waste assay systems

M. Bruggeman, J. Gerits, R. Carchon

Research output › peer-review

Abstract

This article outlines a simple experimental procedure to obtain the minimum biased detection efficiency calibration for gamma waste assay systems using the so called shell-source method in cylindrical waste drums. The conventional use of the shell-source method to simulate a homogeneous activity distribution in a cylindrical waste drum results in a systematic underestimation of the detection efficiency. The bias may be more then 30% at gamma energies of 59 keV and a waste density of 2 g/cm³. Experimental evidence of this bias is given for the low level waste assay system, Q², and a simple measurement procedure to eliminate this bias is presented. The proposed method does not rely on data from computer simulations and is applicable to all types of waste matrices.

Original language	English
Pages (from-to)	255-259
Number of pages	5
Journal	Applied Radiation and Isotopes
Volume	51
Issue number	3
DOIs	https://doi.org/10.1016/S0969-8043(99)00041-X
State	Published - Sep 1999

ASJC Scopus subject areas

Radiation

Access to Document

10.1016/S0969-8043(99)00041-X

Cite this

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title = "A minimum biased shell-source method for the calibration of rad waste assay systems",

abstract = "This article outlines a simple experimental procedure to obtain the minimum biased detection efficiency calibration for gamma waste assay systems using the so called shell-source method in cylindrical waste drums. The conventional use of the shell-source method to simulate a homogeneous activity distribution in a cylindrical waste drum results in a systematic underestimation of the detection efficiency. The bias may be more then 30\% at gamma energies of 59 keV and a waste density of 2 g/cm3. Experimental evidence of this bias is given for the low level waste assay system, Q2, and a simple measurement procedure to eliminate this bias is presented. The proposed method does not rely on data from computer simulations and is applicable to all types of waste matrices.",

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AB - This article outlines a simple experimental procedure to obtain the minimum biased detection efficiency calibration for gamma waste assay systems using the so called shell-source method in cylindrical waste drums. The conventional use of the shell-source method to simulate a homogeneous activity distribution in a cylindrical waste drum results in a systematic underestimation of the detection efficiency. The bias may be more then 30% at gamma energies of 59 keV and a waste density of 2 g/cm3. Experimental evidence of this bias is given for the low level waste assay system, Q2, and a simple measurement procedure to eliminate this bias is presented. The proposed method does not rely on data from computer simulations and is applicable to all types of waste matrices.

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