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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。
Objective To understand the basic situation of using PET / CT in Shanghai and to monitor the current situation of PET / CT in Shanghai through the monitoring of radioactive levels in the PET / CT workplace. METHODS: The PET / CT medical institutions in Shanghai were surveyed on site with two detection indexes of γ-radiation air dose rate and β-surface contamination. Results As of the end of 2011, there were 13 PET / CT stations in Shanghai. On-site tests showed that the radiation dose rate of γ radiation in the waiting room and injection room was relatively high, reaching 19 552 nSv / h around the waiting room door, up to 6 136 nSv / h in the injection room and up to 5408 nSv in the center of the injection room / h. Beta surface contamination in the PET / CT workplace did not exceed the national standard limits, but the injection room, especially the transfer window and the waste bucket were still high around. Conclusion The radiation protection of PET / CT workplace in Shanghai is appropriate and the surface pollution level in the workplace can be controlled within the standard limits. However, there is no limit to the dose rate of γ-radiation absorbed by the national standards for nuclear medicine such as PET / CT. The focus is still on the protection of external radiation.