Affiliation:
1. Alexandria University, Faculty of Science, Physics Department, Alexandria, Egypt
Abstract
When using gamma ray spectrometry for radioactivity analysis of environmental
samples (such as soil, sediment or ash of a living organism), relevant linear
attenuation coefficients should be known - in order to calculate
self-absorption in the sample bulk. This parameter is additionally important
since the unidentified samples are normally different in composition and
density from the reference ones (the latter being e. g. liquid sources,
commonly used for detection efficiency calibration in radioactivity
monitoring). This work aims at introducing a numerical simulation method for
calculation of linear attenuation coefficients without the use of a
collimator. The method is primarily based on calculations of the effective
solid angles - compound parameters accounting for the emission and detection
probabilities, as well as for the source-to-detector geometrical
configuration. The efficiency transfer principle and average path lengths
through the samples themselves are employed, too. The results obtained are
compared with those from the NIST-XCOM data base; close agreement confirms
the validity of the numerical simulation method approach.
Publisher
National Library of Serbia
Subject
Safety, Risk, Reliability and Quality,Nuclear Energy and Engineering
Cited by
14 articles.
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