Fading correction plays an important role in the application of commercially available BaBrF:Eu2+ 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 244Cm source as the alpha-ray source having a specific radioactivity of 1,638.5 Bq/cm2 including beta and gamma-ray (alpha energy of 5.763 and 5.805 MeV). Annealing at 80 degrees 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.
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Health, Toxicology and Mutagenesis