盘锦市某医院核医学科碘治疗项目放射防护屏蔽计算与剂量估算

Radiation protection shielding calculation and dose estimation of iodine treatment project of nuclear medicine department of a hospital in Panjin City

目的通过对盘锦市某医院核医学科碘治疗项目进行放射防护预测性评估,了解碘治疗项目的放射防护水平。方法2021年10月,采用理论计算法和综合分析法,对盘锦市某医院核医学科碘治疗工作场所的放射性职业病危害防护措施和设施进行放射防护屏蔽计算和剂量估算。结果该项目存在的放射性职业病危害因素主要是分装、转运和口服过程中的含Na^(131)I的放射性药物,核素Na^(131)I衰变发出的γ射线及口服过^(131)I放射性药物的受检者。估算结果显示,碘治疗工作区护师与医师岗位全身(0.01 mSv/a)、眼晶体(0.01 mSv/a)、手部(0.04 mSv/a)的年当量剂量均低于国家职业剂量限值与年剂量管理目标值。结论碘治疗工作区的总体屏蔽设计合理,但存在个别功能用房的防护门外关注点剂量率较高。针对关注点剂量率较高的区域,建议加强管理,不要长时间停留。

Objective Through the predictive analysis and evaluation of the radiation protection in the iodine treatment project of the nuclear medicine department of a hospital in Panjin City,to understand the level of radiation protection the iodine treatment project.Methods In October 2021,the theoretical calculation method and the comprehensive analysis method were used for the radiation protection shielding calculation and dose estimation of protective measures and facilities against radioactive occupational hazards in iodine treatment workplace of nuclear medicine department of a hospital in Panjin City.Results The radioactive occupational hazard factors in this project were the radiopharmaceuticals containing Na^(131)I,γ-ray emitted by the decay of nuclilide Na^(131)I,and the subjects who have taken ^(131) I radioactive drugs.The estimate results showed that the annual equivalent dose of whole body(0.01 mSv/a),eye lens(0.01 mSv/a),hand(0.04 mSv/a)of nurses and physicians in iodine treatment work area were lower than the national occupational dose limit and annual dose management target value.Conclusions The overall shielding design of the iodine treatment work area is reasonable,but there is a high dose rate outside the protection door of some individual functional rooms.For areas with high dose rate,it is recommended management should be strengthened and people should not stay for a long time.