Development of Personal Dosimeter Using Electronic Dose Conversion Method

Personal dosimeters based on PIN detectors have been widely used because of their simplicity and real time operation. In this paper, the optimal filter thickness and material designed by the Monte Carlo method is 1.0 mm Al plus 0.2 mm Cu. From the results of radiation characteristic analyses, the developed dosimeter has good performance when it is compared with the other conventional those as described below; The linearity due to the change of radiation intensity is kept within 8 % in 10 Sv ∼ 4 Sv, and the relative energy response to Cs is almost constant within ±10 % for above 65 keV. Generally the relative energy response of conventional dosimeter using a PIN diode is within ±20 %. For minimizing the non-linear sensitivity on energy, dose conversion algorithm was presented, which was able to consider pulse number as well as pulse amplitude related to absorbed energies. When dose conversion algorithm was used, the linearity of sensitivity was better about 38 % than that of dosimeters without usage of the electronic dose conversion algorithm.