Health Physics Department, Vrije Universiteit Brussel and UZ Brussel, Laarbeeklaan 103, 1090 Brussels, Belgium.
Eur J Radiol. 2012 Sep;81(9):e962-6. doi: 10.1016/j.ejrad.2012.06.014. Epub 2012 Jul 15.
The use of ionising radiation in medical imaging is accompanied with occupational exposure which should be limited by optimised room design and safety instructions. These measures can however not prevent that workers are exposed to instantaneous dose rates, e.g. the residual exposure through shielding or the exposure of discharged nuclear medicine patients. The latter elements are often questioned by workers and detailed assessment should give more information about the impact on the individual radiation dose.
Cumulated radiation exposure was measured in a university hospital during a period of 6 months by means of thermoluminescent dosimeters. Radiation exposure was measured at background locations and at locations where enhanced exposure levels are expected but where the impact on the individual exposure is unclear.
The results show a normal distribution of the cumulated background radiation level. No enhanced cumulated radiation exposure which significantly differs from this background level could be found during the operation of intra-oral apparatus, during ultrasonography procedures among nuclear medicine patients and at operator consoles of most CT-rooms.
This 6 months survey offers useful information about occupational low level exposure in medical imaging and the findings can be useful in both risk communication and decision making.
医学影像学中使用电离辐射伴随着职业照射，应通过优化机房设计和安全说明将其限制在一定范围内。然而，这些措施并不能防止工作人员受到瞬时剂量率的照射，例如屏蔽的剩余照射或已排出核医学患者的照射。后者通常会受到工作人员的质疑，详细评估应提供更多关于对个人辐射剂量影响的信息。
在大学医院进行了为期 6 个月的热释光剂量计测量，以测量累积辐射暴露量。在背景位置和预计会出现增强暴露水平但对个人暴露影响尚不清楚的位置进行了辐射暴露测量。
结果显示累积背景辐射水平呈正态分布。在口腔内仪器操作、核医学患者超声检查期间以及大多数 CT 机房的操作控制台，都未发现与背景水平显著不同的累积增强辐射暴露。
这项 6 个月的调查提供了有关医学影像学中职业低水平暴露的有用信息，这些发现对于风险沟通和决策制定都非常有用。
