Performance of the Harwell tape-tab alanine EPR dosimeter under typical production conditions. Effect of irradiation and storage temperature on the stability of the response

The performance of the alanine tape-tab alanine dosimeter (Harwell) under typical irradiation conditions found on an industrial Co-60 gamma sterilization facility has been investigated over a period of 11 and 56 days. The factors investigated were the pre-irradiation temperature storage, the temperature during irradiation, and the time after irradiation. The response measurements were statistically analyzed using 2-Sample T-Test and ANOVA. The results show that for the purpose of the use of this system in a processing facility the response of the dosimeter can be considered stable over the period of time considered in this study. •Effect of irradiation temperature on the response of alanine films under typical gamma production conditions was studied•Stability of the response was followed for a period of eleven days.•Response data was analyzed the statistical technique ANOVA•The response of the alanine films falls/increases over the first 24 h and remains stable for the rest of the time. However this change is within the associated uncertainty given by the ANOVA analysis.