RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Fundamental Studies on the Radioactive Thichness Gage (I) Absorption Curve
Takami KOYANAGIIsao KIMURA
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1964 Volume 13 Issue 6 Pages 465-471

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Abstract

The absorption characteristics of radiations in the materials are the base of the radioactive thickness gage. To make the basis firm, the absorption curves of six kinds of metallic materials (Al, Fe, Ni, Cu, Sn, Pb) and six nonmetallic materials (vinyl, celluloid, polyethylene and three kinds of paper) are obtained experimentally, using 90Sr+90Y as the β-ray source. Two kinds of detector, scintillation detector and ionization air chamber are used. The gists may be pointed as follows:
(1) The absorption curves are affected by the experimental arrangements for thinner absorbers than a maximum range of the β-rays, especially with small field size.
(2) The absorption curves are changed by the kinds of material, namely the absorption of β-rays increases with increasing atomic number. These two phenomena can be explained by the scattering of β-rays.
(3) For the materials thicker than a maximum range, the effects of Bremsstrahlung are remarkable, when the scintillation detector is used.

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© Japan Radioisotope Association
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