Effect of SSD and absorbing filter in calibration process of Thermo Luminescence Dosimeter TLD-700

Abstract

It had been carried out the study about effect of the skin source distance (SSD) and absorbing filter in the callibration process of Thermo Luminescence Dosimeter TDL-700. This effect used the analysis of dose radiation from output using Cs-137 in the calibration process of TLD-700. The calibration process used different measurement at an SSD of 100, 150, 200, and 250 cms and different scales of 0.1, 0.5, 1.0, 3.0 and 5.0 mSvs, respectively. We found that the larger the radiation source used, the greater exposure dose were accepted. Dose radiation output from source Cs-137 source values obtained optimal dose in distance 200 cm absorbed by using filters. The results of the measurement of the output dose using variation of SSD and the variation of absorbed filter on TLD-700 calibration showed that the value of dose that have deviation with the predicted dose less than 6.0%. The measurement of radiation output dose with Cs-137 source on TLD-700 calibration process shows that the larger required dose at the time of irradiation, the greater the radiation time should be given. Radiation measurement of Cs-137 source without absorbed filter is very high so that the irradiation time is relatively short. This is because the radiation emitted by the Cs-137 source is directly absorbed by the TLD-700 during irradiation.