Preliminary study of the portable Optically Stimulated Luminescence dosimetry system for measuring radiation doses more than 100 Gy

In the high intensity accelerators of the Japan Proton Accelerator Research Complex (J-PARC), a small size dosimeter for measuring radiation dose of more than 100 Gy is required. We studied the applicability of a commercialized Optically Stimulated Luminescence (OSL) dosimetry system using Al₂O₃:C crystals for radiation detection. To evaluate the dose response characteristics of the OSL dosimeter, the dosimeters were exposed to 0.09 - 696 Gy of ⁶⁰Co gamma-rays and read using a portable OSL reader. A fitting curve for interpolating the experimental results was in good agreement with the response of dosimeters at ±3%. Based on the results, we concluded that our dosimetry system can evaluate the radiation dose of up to 245 Gy of ⁶⁰Co gamma-rays. (author)