The administration of 99mTc-HDP to diagnose pulmonary thromboembolisms leads to the presence of 99mTc in the environment of a nuclear medicine department, which could pose a potential risk of internal contamination to medical staff. Therefore, air samples from the administration room, gamma camera room and corridor of such a department were taken for the purpose of performing a workplace monitoring program of the medical centre under study, with maximum activity values of 640 ± 30 kBq/m3, 1.5 ± 0.1 kBq/m3 and 54 ± 3 kBq/m3, respectively, being obtained. These results correspond to committed effective doses received by exposed employees, via inhalation, when one ventilation/perfusion single-photon emission tomography study was performed, of 0.7 μSv, 0.004 μSv and 0.2 μSv, respectively. As inhalation is the employees' main exposure pathway to radio-aerosols, the internal dose of the nuclear medicine department's medical staff was also evaluated via urine bioassay measurements. Nuclear medicine nurses showed the highest 99mTc activity in 24-h urine samples (2100 ± 130 Bq/day), resulting in a committed effective dose of 21 μSv for each diagnostic study performed. Even so, the performance of ventilation/perfusion diagnostic studies did not constitute a substantial radiological risk since the annual dose limit for exposed employees was not exceeded.

中文翻译：

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核医学：通风/灌注单光子发射断层扫描期间的工作场所监测和内部职业暴露。

对99mTc-HDP进行诊断肺血栓栓塞的诊断会导致核医学部门环境中存在99mTc，这可能对医务人员造成内部污染的潜在风险。因此，从该科室的行政室，伽马照相室和走廊采集空气样本，目的是执行所研究医学中心的工作场所监控程序，最大活动值为640±30 kBq / m3，1.5±分别获得0.1 kBq / m3和54±3 kBq / m3。这些结果对应于暴露的员工通过吸入进行的一次通气/灌注单光子发射断层显像研究得出的有效有效剂量，分别为0.7μSv，0.004μSv和0.2μSv。吸入是员工的 通过放射性气溶胶的主要暴露途径，还通过尿液生物测定法评估了核医学科医务人员的内部剂量。核医学护士在24小时尿液样本中显示出最高的99mTc活性（2100±130 Bq /天），因此每次诊断研究的有效剂量为21μSv。即便如此，进行通气/灌注诊断研究并没有构成重大的放射学风险，因为未超过暴露雇员的年度剂量限制。导致每次诊断研究的有效有效剂量为21μSv。即便如此，进行通气/灌注诊断研究并没有构成重大的放射学风险，因为未超过暴露雇员的年度剂量限制。导致每次诊断研究的有效有效剂量为21μSv。即便如此，进行通气/灌注诊断研究并没有构成重大的放射学风险，因为未超过暴露雇员的年度剂量限制。