B3 선량계 기반 투과깊이선량 분포의 해석적 방법을 통한 10 MeV 전자가속기 공정의 균일성 평가

Abstract

The demand for industrial using through accelerators is increasing. There are various methods to measure the absorbed dose of the sample irradiated with electron beam, but among these, a comparatively easy and simple method is used to evaluate the B3 film dosimeter developed by the Riso Institute of Denmark. Accordingly, the B3 dosimeter was used to check the Penetration Depth Distribution (PDD) for each medium and determine the optimal dose according to the experiment. After verifying the linearity of the dose according to the conveyor speed in order to secure the reliability of the results and confirm the stability of the operation, the experiment was conducted based on ISO / ASTTM 51649, which is known as a guideline for dose evaluation in the field of radiation processing. The PDD graph was respectively checked on the Polyethylene (PE), Polyethylene terephthalate (PET), Acrylic, Polyvinyl chloride (PVC) and Aluminum plate with density of 0.722, 1.206, 1.289, 1.611, and 2.667 g·cm-3. The optimal depth was reached at about 34 cm for low density materials and about 17 to 24 cm for high density. It was verified through experiments that it was dominant in density, but it was found that in the case of acrylic, about 5 cm of thickness was required to reach the optimum depth compared to PET with low density. Through this, in addition to physical factors such as density, the mechanism according to the binding state of the polymer material should be identified and will be studied in the future work.