Li2B4O7(Cu) 素子による自動読取型個人被曝線量計の開発 (I) : γ線,β線線量当量評価法

概要

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Characteristics of Li2B4O7 TL element was studied for the design of new personnel dosimeter. According to the results, a eight-element thermoluminescent dosimeter (TLD badge) for gamma ray, beta ray and neutron has been developed using Li2B4O7(Cu) and CaSO4(Tm) elements. Each element is measured by an automatic TLD reader connected into computer system. Each dose and effective energy of beta ray are able to be evaluated by this TLD badge.One Li2B4O7 and one CaSO4 elements for gamma ray are shielded to provide interpretation of 1, 000mg/cm2 tissue depth dose and two Li2B4O7 elements are used for beta absorbed dose interpretation. Three 6Li210B4O7 and one 7Li211B4O7 elements are used for thermal and fast neutron.Minimum detectable amount of this badge is 2 mrem for gamma ray and 20 mrem for beta ray in the mixed field.