On the theory of the gamma-ray transmission, dual-distance principle of determining thickness

Equations are developed for nondestructively determining the thickness of a slab of material of arbitrary composition and density. The equations for determining the accuracy of the principle, the optimum distance between detector positions, and the required source intensities are also developed. For...

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Bibliographic Details
Published in:Nuclear engineering and design 1971, Vol.15, p.237-240
Main Authors: Ely, R.L., Gardner, R.P.
Format: Article
Language:English
Online Access:Get full text
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Summary:Equations are developed for nondestructively determining the thickness of a slab of material of arbitrary composition and density. The equations for determining the accuracy of the principle, the optimum distance between detector positions, and the required source intensities are also developed. For the particular case of measuring the thickness of reinforced concrete pavement a 1.32 millicurie source of 0.662 MeV gamma rays or a 0.782 millicurie source of 1.33 MeV gamma rays is required. This is to obtain a measurements standard deviation of 0.125 in when a 9-in thickness is measured with a 1-in radius by 2-in thick sodium iodide crystal and when 1-min counting times are employed.
ISSN:0029-5493
1872-759X
DOI:10.1016/0029-5493(71)90066-5