NUKLEONIKA 2006, 51(3):175-178
Farhood Ziaie1,2, Abbas Noori2
1 Material and Ion Beam Application Division,
Nuclear Research Center for Agriculture and Medicine, P. O. Box 31485-498, Karaj, Iran
2 Yazd Radiation Processing Center, P. O. Box 89175-389, Yazd, Iran
In this work attempts have been made to investigate the variation of polystyrene calorimeter response
after frequent irradiations with an electron beam. Polystyrene calorimeters are routinely used in
every radiation processing center as a traceable to NPL primary standard dosimeter. Thus, self designed
high impact polystyrene as the calorimeter core was irradiated several times up to many thousands of kGy
doses. After each irradiation, the specific heat capacity of the polystyrene as the main changeable
parameter was measured using the differential scanning calorimeter system (DSC) in the practical
temperature range of polystyrene calorimeter. Therefore, correction factors to calculate the precise
absorbed dose were obtained. At the final stage, several these calorimeters were irradiated
simultaneously along with two Risoe standard calorimeters and another correction factor for each tested
calorimeter was calculated.