| 摘要 |
PURPOSE: A TLD(Thermo-Luminescent Dosimeter) is provided to measure beta rays or beta-photon compound radial rays radiated from sealed-off radioisotope as well as X-rays and gamma radial rays. CONSTITUTION: A TLD is composed of an element plate(20) including two elements(20b,20c) made from CaSO4(Tm) and one element(20d) made from Li2B4O7(Cu); a badge(10) for embedding the element plate and including a filter for distinguishing a radiation field; a badge case having a receiving groove for embedding the badge and a wearing device arranged to the side and worn by a radial ray operator; an open window-type beta incident window without the filter arranged to the badge at the position corresponding to the one element of the two elements made from the CaSO4; the filter made from plastic and cupper and arranged to the badge at the position corresponding to the other element made from the CaSO4 and the element made from the Li2B4O7; and an open window without the filter disposed to the badge case at the position corresponding to the element of the badge without the filter in two elements made from the CaSO4.
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