2.5 MeV电子加速器X射线血液辐照仪的均整器及辐射防护设计

X-ray Flattening Filter and Radiation Protection Designing for 2.5 MeV Electron Linear Accelerator Used for Blood Irradiator

根据新型冠状病毒肺炎疫情的需求及血液辐照仪的技术要求,采用蒙特卡罗软件FLUKA对一种2.5 MeV电子加速器X射线血液辐照仪的均整器和辐射防护进行了设计与仿真。仿真结果表明:均整后,照射区域内的吸收剂量率最大差异为7.6%,射线中心剂量率为均整前的57.6%,辐照仪整机外围5 cm处的剂量率最大为1μSv/h,优于血液辐照仪的使用标准;经估算,要保证血液吸收剂量为25 Gy,只需要照射4.5 min。

According to the current situation of the COVID-19 and the technical requirements of blood irradiators,this paper proposes a 2.5 MeV electron accelerator X-ray blood irradiator and designs its flattening filter and shielding structure.After detailed simulation design,the maximum difference of absorbed dose rate was about 7.6%,and the central absorbed dose rate was 57.6%as much as before.Meanwhile,the maximum dose rate at 5 cm outside the whole irradiator was 1μSv/h,which could fully meet the requirements of blood irradiator.It was estimated that only 4.5 minutes of exposure was needed to ensure the blood exposure dose of 25 Gy.