Abstract
Background and Aim: Gamma radiation is commercially used in food preservation by extending shelf life and the success of radiation preservation of food depends upon the ability of the processor of successful measurement of the radiation dose delivered to the foods. Several dosimeters are already used in radiation processing plant to measure the delivered dose. The aim of the present study was to develop a simple and appropriate chemical dosimetry system covering a wide dose range (1-30kGy) of food irradiation. Materials and Methods: The response of the ferrous ammonium sulfate (Fe(NH 4 ) 2 (SO 4 ) 2 ,6H 2 O) - cupric sulfate (CuSO 4 ,5H 2 O) dosimetry system was studied at two different gamma chambers of GC-5000 and GC-900 and at a radiation processing plant with four different salt concentrations and at the dose range of 1-30kGy. Results and Discussion: The system with highest salt concentration i.e. with 6x0.001mmol Fe(NH 4 ) 2 (SO 4 ) 2 ,6H 2 O + 6x0.01mmol CuSO 4 ,5H 2 O showed linear response in the applied dose range of 1kGy to 30kGy. Good reproducibility of the system was observed at both GC-5000 and GC-900 with different dose rate and irradiation temperature. Routine dosimetry and dose mapping at radiation processing plant with the standard Ceric-cerous dosimetry system with same salt concentration also showed good agreement with 5% difference. The system was stable upto 7 days before and after irradiation at 4 o C and at darkness. The estimated overall precision for the dose assessment over the dose range of interest was about 2% irrespective of the dose rate and irradiation temperature. Conclusion: The ferrous ammonium sulfate (Fe(NH 4 ) 2 (SO 4 ) 2 ,6H 2 O) - cupric sulfate (CuSO 4 ,5H 2 O) dosimetry system with highest salt concentration i.e. with 6x0.001mmol Fe(NH 4 ) 2 (SO 4 ) 2 ,6H 2 O + 6x0.01mmol CuSO 4 ,5H 2 O can be successfully used as chemical dosimeters in the dose range of 1-30kGy.
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