Possible Application of an Imaging Plate to Space Radiation Dosimetry

概要

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Fading correction plays an important role in the application of commercially available BaBrF:Eu^<2+> phosphors: imaging plates (IP) to dosimetry. We successfully determined a fading correction equation, which is a function of elapsed time and absolute temperature, as the sum of several exponentially decaying components having different half-lives. In this work, a new method was developed to eliminate a short half-life component by annealing the IP and estimating the radiation dose with the long half-life components. Annealing decreases the effect of fading on the estimated dose, however, it also causes the loss of photo-stimulated luminescence (PSL). Considering an IP as an integral detector for a specific period of up to one month, the practically optimum conditions for quantitative measurement with two types of IP (BAS-TR and BAS-MS) were evaluated by using the fading correction equation, which was obtained after irradiation with a ^<244>Cm source as the alpha-ray source having a specific radioactivity of 1,638.5 Bq/cm^2 including beta and gamma-ray (alpha energy of 5.763 and 5.805 MeV). Annealing at 80°C for 24 hours after irradiation for one month using BAS-MS should minimize the effect of the elapsed time, resulting in sufficient sensitivity. The results demonstrate new possibilities for radiation dosimetry offered by the use of an IP.
日本放射線影響学会の論文