Gamma dose mapping at D2O heat exchanger room, valve room -Dhruva reactor using EPR dosimetry

Full text: Radiation induced paramagnetic radicals in suitable matrices, are reported to have dosimetric applications as EPR dosimetry. The Dose - Signal response are found to be linear in a few matrices, could find use in dose estimates of higher range. EPR dosimetry finds application in gamma dose measurements whenever the dose range is above Gy level. Such suitable matrices are used as cumulative dosimeters in EPR dosimetry. The present study describes the dose mapping of D2O heat exchanger room and Valve room of Dhruva reactor, while the EPR dosimetry was carried out with Alanine and Lithium Carbonate material in powder form as the dosimeters for cumulative gamma dose measurements. The samples in duplicate, were irradiated for two different set of irradiation time intervals. Results of the two sets of irradiations for 600 hours (∼ 25 days) and 1200 hours (∼ 50 days) of gamma irradiation and their dosimetric signal readings, found to agree within ± 5%, are presented