The Design of Radiation Processing Electron Beam Calorimeter

At present, the electron beam radiation processing industry has developed rapidly in China, and has been applied in many aspects, such as irradiation sterilization of food, irradiation disinfection of drugs, etc. The primary standard dose apparatus (calorimeter) of absolute measurement method is indispensable in the measurement of electron beam absorption dose of irradiation processing stage. Therefore, a calorimeter can be designed to measure the absorption dose of electron beam in radiation processing stage. High purity graphite is used as absorber, EPS is used as insulation material, and the structure of each part is designed according to MCNP absorption dose simulation results. The specific dimensions of each part are determined by using ANSYS simulation analysis software. Based on the calorimeter, the resistance resistance of the absorber was measured by using a high precision thermometer bridge of microk250. The results of the measurement of the electron beam absorption dose at 10 MeV nominal energy were obtained. The ratio of the time change of the absorber to the amount of absorbent was obtained. The influence factors of calorimeter accuracy were discussed. The total uncertainty of measuring electron beam absorption dose at energy of 10 MeV was 1.43. The results provide a reference for the measurement of absorbed dose of radiation processing electron beam.