碘治疗工作场所空气中^(131)I的监测结果与分析

Monitoring results and analysis of ^(131)I in the air of workplace treated with iodine

目的了解碘治疗工作场所空气中^(131)I气溶胶的活度浓度,估算核医学科医务人员吸入^(131)I所致内照射剂量。方法使用CF-1001BRL型便携式大容量空气采样器,采用碘盒收集山东省6家医院核医学科碘治疗工作场所空气中的^(131)I气溶胶,利用HPGe-γ能谱仪对样品进行测量,得到6家医院碘治疗工作场所中^(131)I的活度浓度值,并估算医务人员的内照射剂量。结果6家医院碘治疗工作场所空气中^(131)I的活度浓度范围为3.64~2.94×10^(3)Bq/m^(3),控制区(病房、患者通道、分装间、远程操作给药室)^(131)I的浓度水平明显高于监督区,监督区^(131)I的浓度最高的是医护通道,为2.62×10^(2)Bq/m^(3)。核医学科医务人员两种职业待积有效剂量估算值为0.07~5.68 mSv,均未超过国家规定限值。结论医院核医学科碘治疗工作场所仍存在不可忽视的^(131)I气溶胶污染现象,应面向全国各地区核医学科开展内照射监测,探索更加合理的防护标准和方法。

Objective To understand the activity concentration of ^(131)I aerosol in the air of the iodine treatment workplace and estimate the internal dose of ^(131)I inhaled by medical staff in nuclear medicine.Methods Using CF-1001BRL portable large capacity air sampler,the ^(131)I aerosol in the iodine treatment workplace of nuclear medicine department of 6 hospitals in Shandong province was collected by iodine box,and the HPGe-γenergy spectrometer was used to measure the samples.The ^(131)I activity concentration in iodine treatment workplace at 6 hospitals was obtained,and the internal dose to medical staff was estimated.Results The ^(131)I activity concentration in the air in iodine treatment workplaces at 6 hospitals ranged from 3.64 to 2.94×10^(3) Bq/m^(3).The ^(131)I activity concentration in the controlled area(ward,patient passageway,subpacking room,operation administration room)was significantly higher than that in the supervised area.The highest ^(131)I activity concentration,2.62×10^(2) Bq/m^(3),in the supervised area was found in the medical care passageway.The estimated effective dose to nuclear medicine workers was 0.07-5.68 mSv,not exceeding the national limit.Conclusions The phenomenon of ^(131)I aerosol contamination still exists in the iodine treatment workplaces of nuclear medicine departments in hospitals,so it is necessary to carry out internal radiation monitoring for nuclear medicine departments all around the country,and explore more reasonable protection standards and methods.