实验型钴—60辐照装置技术改造及钴源增量后的辐射防护安全评价

Evaluation of Radiation Protection after the Alteration of ^(60)Co Irradiation Equipment and the Augmentation of ^(60)Co Load Volume

为了适应医疗用品辐照灭菌新技术的需要,提高辐照装置使用效益,我们将本院原实验型钴—60辐照装置的钴源装载量由0.934PBq 增至2.32PBq,并对源室进行了技术改造。辐射防护水平测量结果,经省市等有关部门验收,符合国家放射防护标准。改造后的辐照装置,增加了安全措施,在离地2000mm 范围内,吸收剂量高程分布均匀度从原来的1.95降至1.34;达到国外自动传送辐照装置的水平。解决了利用实验型钴—60辐照装置开展工业规模辐照的生产技术问题。

In order to carry out the irradiation sterilization of medical devices,we haveaugmented the ^(60)Co load volume to 2.32 pBq,imoroved the properties of theradiation field and altered the radiation room.All these changes have been checkedand accepted by the authorities concerned of Jiangsu Province and Suzhou City.The alteration increases safety and improves the uniformity of high-range dosedistribution in the radiation field.The uniformity turns from the original 1.95 tothe present 1.34 within the height of 2000 mm from the ground surface and thus can be compared with that of automatic irradiation conveyor abroad.The alterationmakes it possible to carry out irradation treatment of industrial scale by means of^(60)Co irradiation equipment designed for biomedical experimeriments.