Irradiation and ESR analysis temperature dependence of the gamma-ray response of alanine-polystyrene dosimeters

Response characteristics of the alanine-polystyrene dosimeter were studied at an absorbed dose of 5 kGy over the low irradiation temperature range −196 ∼ 30°C, and the ESR analysis temperature range 0 ∼ 50°C in the dose range 0.1 ∼ 10 kGy. The irradiation temperature coefficient previously estimated for the temperature range from 0 ∼ 70°C (+0.24%/°C) was verified down to −15°C, although about 8% lower values were obtained at −78 and −196°C based on the correction using the above coefficient. ESR intensity decreases with temperature during ESR analysis following the function of the reciprocal of absolute temperature based on Boltzmann's constant. The average temperature coefficient for three different dose levels during ESR analysis of the alanine-polystyrene dosimeter is −0.25%/K in the temperature range 0 ∼ 50°C.