Experimental Evaluation of a Radiophotoluminescent Glass Dosimeter in High-Energy Photon Beam

Recently, the radiophotoluminescent (RPL) glass dosimeter (GD) system has been widely used in experimental fields for the purpose of measuring radiation dose. The glass dosimeter can be readout by two measuring modes; one is to use standard dose range (10 μGy- 10 Gy), and the other is to use high-dose range (1 Gy- 500 Gy). While the high-dose range mode is used in radiation therapy, the standard mode is used in the dosimetry of diagnostic x-ray or environmental exposures.[1] The purpose of this study is to investigate the experimental evaluation of characteristics of the glass dosimeter for the dosimetry of clinical use. For this reason, we examine dosimetric properties of the glass dosimeter concerning dose linearity at high absorbed dose, uniformity among GD lots, and reproducibility of reader. Recently, the radiophotoluminescent (RPL) glass dosimeter (GD) system has been widely used in experimental fields for the purpose of measuring radiation dose. The glass dosimeter can be readout by two measuring modes; one is to use standard dose range (10 μGy- 10 Gy), and the other is to use high-dose range (1 Gy- 500 Gy). While the high-dose range mode is used in radiation therapy, the standard mode is used in the dosimetry of diagnostic x-ray or environmental exposures. The purpose of this study is to investigate the experimental evaluation of characteristics of the glass dosimeter for the dosimetry of clinical use. For this reason, we examine dosimetric properties of the glass dosimeter concerning dose linearity at high absorbed dose, uniformity among GD lots, and reproducibility of reader. The uniformity among GD lots is small variation and each lot tend to similar deviation. But GD uniformity in same lot is much smaller variation. The reproducibility of FGD-1000 reader shown that the more repeated reading consecutively, the more enlarged standard deviation. Also response tend to decreased gradually. Therefore, the irradiation experiment using the GD system is recommended to be used for GD elements of same lot and small reading times.