This paper presents the results of measurements of 99mTc activity concentrations in indoor air in a nuclear medicine department and resulting estimated 99mTc intake by medical personnel. 99mTc air activity measurements were conducted at the Nuclear Medicine Department, John Paul II Hospital, Krakow, Poland, during ventilation-perfusion SPECT lung scans. Technetium from the air was collected by means of a mobile aerosol sampler with a Petryanov filter operating at an average flow rate of 10 dm3 min-1. Measured activities ranged from 99 ± 11 to 6.1 ± 0.5 kBq m-3. The resulting daily average intake of 99mTc by medical staff was estimated to be 5.4 kBq, 4.4 kBq, 3.0 kBq and 2.5 kBq, respectively, for male technicians, female technicians, male nurses and female nurses. Corresponding annual effective doses were 1.6 µSv for technicians and 1 µSv for nurses. The highest equivalent dose values were determined for extrathoracic (ET) airways: 5 µSv and 10 µSv for nurses and technicians, respectively. It is concluded that estimated annual absorbed doses are over three orders of magnitude lower than the dose limit established in the Polish Atomic Law Act and in recommendations of the International Commission on Radiological Protection for medical staff.

中文翻译：

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在通气-灌注肺部扫描过程中，室内空气中的99mTc活动浓度较高，并导致医务人员内部污染。

本文介绍了核医学部门室内空气中99mTc活性浓度的测量结果以及由此得出的医务人员估计的99mTc摄入量。在通气-灌注SPECT肺部扫描期间，在波兰克拉科夫的约翰保罗II医院核医学科进行了99mTc的空气活动测量。空气中的是通过带有Petryanov过滤器的移动式气溶胶采样器收集的，其平均流速为10 dm3 min-1。测得的活性范围为99±11至6.1±0.5 kBq m-3。据估计，男性技术人员，女性技术人员，男性护士和女性护士的医务人员每天平均摄入量为99mTc，分别为5.4 kBq，4.4 kBq，3.0 kBq和2.5 kBq。相应的年度有效剂量为1。技术人员为6 µSv，护士为1 µSv。确定了胸外（ET）气道的最高等效剂量值：护士和技术人员分别为5 µSv和10 µSv。结论是，估计的年度吸收剂量比《波兰原子法》和国际放射防护委员会对医务人员的建议所规定的剂量限值低三个数量级。