Evaluation of polycarbonate films as detection materials for high-dose electron-beam radiation detection

摘要: In this study, the dosimetric characteristics (thickness applicability, preheating time, temperature and hu midity dependence, in-batch uniformity, readout reproducibility, dose linearity, self-decay, and electron energy response) of engineered polycarbonate films irradiated with an electron beam (0−−600kGy) were investigated using photoluminescence spectroscopy. The results show a linear relationship between photoluminescence in tensity and radiation dose when the thickness of the polycarbonate film is 0.3mm. A higher fluorescence intensity can be obtained by preheating at 60◦C for 180min before photoluminescence-spectrum analysis. As the temperature during spectral testing and the ambient humidity (during and after irradiation) increased, the photoluminescence intensity of the polycarbonate films decreased. The photoluminescence-intensity deviation of the polycarbonate films produced within the same batch at 100kGy is 2.73%. After ten times of repeated excitations and readouts, the coefficients of variation in photoluminescence intensity are less than 8.6%, and the linear correlation coefficient between photoluminescence intensity and irradiation dose is 0.965 in the dose capture range of 20 − 600kGy. Within 60 days of irradiation, the photoluminescence intensity of the polycar bonate film decreased to 60% of the initial value. The response of the 0.3mm polycarbonate films to electron beams with energies exceeding 3.5MeV does not differ significantly. This comprehensive analysis indicates the potential of polycarbonate films as a high-radiation dose detection material.