γ線照射装置による校正場の散乱線の評価 [in Japanese] Estimation of the Scattered Radiations in the Calibration Field Generated by the Gamma-Ray Irradiation System [in Japanese]
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A description follows of an operational-standard irradiation field that has been established by using gamma-ray sources installed at the Radioisotope Research Center of Osaka University. The irradiation system is composed of an irradiator mounted with <sup>60</sup>Co (3.7GBq) and <sup>137</sup>Cs (11.1GBq and 111GBq), and a mobile exposure deck having a lead shield sandwiched with iron at the back side. The irradiator was provided with three kinds of square collimators around the irradiator beam exit. It is the purpose of the present study to utilize the irradiation system for the calibration of commercially manufactured gamma-ray dosimeters. Estimation of the scattered radiation of an irradiation field was achieved by both measurements and calculations. The absorbed dose rates due to the sources mounted in the irradiator were determined with a calibrated ionization chamber, and the contribution of scattered photons from the irradiator equipment was confirmed to be minimal by calculations with a radiation transport code.
- Jpn. J. Health Phys.
Jpn. J. Health Phys. 31(3), 343-347, 1996-09
Japan Health Physics Society