RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Self-dose and Cosmic-ray Dose of CaSO4: Tm (UD-200S) Dosimeter
Hideki TOKUYAMAShuiti IGARASIHironobu HAYAKAWA
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1990 Volume 39 Issue 8 Pages 357-359

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Abstract

Measurement was made to determine self-dose at Mihoro Dam Tunnel where cosmic-ray was fairly attenuated. The dosimeter with Pb and Sn filter had the same self-dose of 0.26 nCkg-1 h-1 as that without the filter. Our experiment shows that self-dose is due to any traces of natural radioactivity in the phosphor and the packaging. Cosmic-ray dose was evaluated 0.74 nC kg-1h-1 from our experiment at sea surface, and this value was somewhat smaller than the cosmic-ray intensity in Japan. The reason is considered to be low TL response for cosmic-ray hard component.

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© Japan Radioisotope Association
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