抄録
The external exposure dose to the radiation worker and the temporary entrant is monitored with a personal dosimeter. Semiconductor-type electronic pocket dosimeters (EPDs), Aloka PDM-102, have been used at the Radioisotope Research Center of Osaka University since 1991.Performance tests of the EPDs were repeatedly undertaken by using the gamma-ray irradiation system which is usable for the calibration of personal dosimeters and survey meters and for low-dose irradiation of experimental animals.The EPDs were set on JIS P-1 phantom to investigate the dose rate response, secular change and angular response.It was confirmed that the indicated value agreed within 1% when EPD was irradiated with a fixed dose equivalent of 42.0 μ Sv at three different dose rates, 242, 168 and 108 μ, Sv/h.Calibration factors obtained in the secular change test were in a range from 1.00 to 1.14.It is concluded that the EPDs are sufficiently acceptable for practical applications.It should be noted that in the angular response test the indicated value from the back side was found about 15% lower than that from the front side.
