2016 年 51 巻 3 号 p. 160-166
With regard to the calibration of dosemeters in the 90Sr/90Y reference field, the influence of the difference of beta-ray irradiation systems on the calibration results has been investigated. Two different types of beta-ray irradiation systems installed at the Facility of Radiation Standards (FRS) in the Japan Atomic Energy Agency (JAEA) were chosen for the comparison. The 90Sr/90Y sources of each system showed different depth-dose profiles reflecting different energy spectra due to their source structure. The difference in depth-dose curves implied the calibration results would be affected in the case of a thick dosemeter. In order to confirm the influence of the difference of depth-dose curves, optically stimulated luminescence ring type dosemeters were irradiated with both systems. The results showed the calibration factors were slightly different as predicted from the depth-dose curves.
