Procedure to measure angular dependences of personal dosimeters by means of diagnostic X-ray equipment

DOI 2 Citations

Search this article

Abstract

【purpose】In order to measure the angular dependence on a personal dosimeter, a new experimental procedure using diagnostic X-ray equipment was proposed. Furthermore, our method was applied to measure the angular dependences of the small-type optically stimulated luminescence (OSL) dosimeter. To evaluate the experimental results, Monte-Carlo simulations of angular dependences were performed.<br>【methods and materials】We developed a new system consisting of a collimator and a rotation unit. An original design of the collimator was proposed by Takegami et al., and we modified the size of the through hole so as to optimize the irradiation field (diameter of 2cm) on the OSL dosimeter. The rotational unit combined with an originally developed supporting fixture can fix a dosimeter in a free air condition. The OSL dosimeters were irradiated by a diagnostic X-ray with tube voltages of 40-140kV, and angular dependences for every 15 degrees were determined. The source to dosimeter distance was 150 cm, and tube current-time product was 100 mAs. For the simulation, we used a Monte-Carlo simulation code (EGS5) . The published micro-CT data were used as a reference to construct the precise structure of the dosimeter. The X-ray spectra were introduced to the dosimeter and energy depositions calculated.<br>【results】For X-rays having tube-voltages of 40-140 kV, we determined angular dependence of the OSL dosimeter every 15 degrees with uncertainties of approximately 5%. For these conditions, simulated data was determined with uncertainties of less than 1%. The experimental data were in good agreement with the simulated data.<br>【conclusion】We concluded that our system was able to measure the angular dependences of the personal dosimeters.

Journal

Citations (2)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top