Evaluation of applicability of hydroxyapatite to individual dosimeters

Oka, Toshitaka   ; Yokozuka, Eri*; Seito, Hajime*; Nagasawa, Naotsugu*; Kitatsuji, Yoshihiro  

Alanine dosimeters and Flick dosimeters are known as simple individual dosimeters, but both can only evaluate more than 1 Gy and 40 Gy, respectively, so that they cannot measure low dose in mGy order. In this work, we evaluated the applicability of hydroxyapatite, which is a main component of tooth enamel, as individual dosimeters that can detect from less than 1 Gy to several tens Gy. Commercially available hydroxyapatite (HAP-200) was irradiated by Co-60 gamma-ray and peak height of the ESR radical was plotted against the absorbed dose to obtain the dose response curve. The dose response curve shows a linear relationship from 0 to 10 Gy with the coefficient of determination of R=1, indicating that hydroxyapatite can be used as an individual dosimeter instead of tooth enamel.