上海市PET/CT工作场所放射性水平监测与分析

目的 了解上海市PET/CT使用基本状况,通过对PET/CT工作场所放射性水平的监测,掌握目前上海市PET/CT场所防护情况。方法 普查上海市PET/CT医疗机构,通过γ辐射空气吸收剂量率和β表面污染两项检测指标进行现场监测。结果 截止2011年底,上海市共有PET/CT 13台。现场检测表明,候诊室及注射室γ辐射空气吸收剂量率水平相对较高,候诊室门四周最高达19 552 nSv/h,注射室桌面最高达6 136 nSv/h,注射室中央最高达5408 nSv/h。PET/CT工作场所β表面污染无超国家标准限值情况,但注射室内,尤其是传递窗及废物桶四周仍然较高。结论 上海市PET/CT工作场所放射防护较得当,工作场所表面污染水平能控制在标准限值内,但国家标准对PET/CT等核医学场所的γ辐射空气吸收剂量率并没有限值,防护重点仍是外照射的防护。

Monitoring and Analysis PET/CT Workplace Radioactivity Level in Shanghai.

Objective To understand the PET/CT basic information in Shanghai, through monitoring radioactivity level of PET/CT workplace, to get the radiological protection information about PET/CT place. Methods Through the γ radiation air absorbed dose rate and the β surface contamination to investigate PET/CT medical institutions in Shanghai. Results By the end of 2011, there were 13 sets of PET/CT. Detecting show that γ radiation air absorbed dose rate is at relatively higher level in waiting room and the injection rooms, the date of waiting room door was up to 19 552 nSv/h, the maximum value of injection room desk surface was 6 136 nSv/b, the middle of injection room was up to 5 408 nSv/h. Any date was certain the limits of national standard of 13 surface contamination, the middle of in the injection room. It is still higher on the window and wastes barrel. Conclusion The radiation protection of PET/CT workplace is proper, surface contamination levels can be contralled within in the standard limits, but there are a blank of limits about nuclear medicine place of γ radiation absorbed dose rate air in the national standard, and external exposure protection is still the key of radiation protection.