熱螢光線量計回転式γ線照射器

概要

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This irradiation unit was designed for γ-ray irradiation of thermoluminescence dosimeters (TLD) used for personnel or environmental monitoring. In view of the variabilities involved in the measurements due to the kind of phosphors, direction of beam etc., a rotary type irradiation was used in order to minimize the variation and to actuallize the working conditions, performance of the unit can be summarized as follows. 1. Each of ten TLD is set on the shaft of each of ten pulse timing motors which is driven under the following conditions : P.V. 100Volts, 10mA, 50Hz, 20RPM. 2. These motors were proved for continuous driving for over one year, so that a long time continuous irradiation is possible. (Present use is from one day to four weeks.) 3. Each TL element (i.e. the position of motor shaft) is set concentric to the position of a radiation source (^<226>Ra 107μg), and the distance from the source can be changed freely from 130 to 20cm. 4. Fitting and removal of the radiation source to and from the unit can be made conveniently. The results of testing, this rotary type γ-irradiator proved satisfactory the unit can be used effectively for TLD examinations.
公益社団法人日本放射線技術学会の論文
1980-03-01