Glasgow G P, Eichling J, Yoder R C
Health Phys. 1986 Jun;50(6):789-95. doi: 10.1097/00004032-198606000-00010.
A series of measurements were conducted to determine the cause of a sudden increase in personnel radiation exposures. One objective of the measurements was to determine if the increases were related to changing from film dosimeters exchanged monthly to TLD-100 dosimeters exchanged quarterly. While small increases were observed in the dose equivalents of most employees, the dose equivalents of personnel operating medical electron linear accelerators with energies greater than 20 MV doubled coincidentally with the change in the personnel dosimeter program. The measurements indicated a small thermal neutron radiation component around the accelerators operated by these personnel. This component caused the doses measured with the TLD-100 dosimeters to be overstated. Therefore, the increase in these personnel dose equivalents was not due to changes in work habits or radiation environments. Either film or TLD-700 dosimeters would be suitable for personnel monitoring around high-energy linear accelerators. The final choice would depend on economics and personal preference.
进行了一系列测量以确定人员辐射暴露突然增加的原因。测量的一个目的是确定这种增加是否与从每月更换一次的胶片剂量计改为每季度更换一次的TLD - 100剂量计有关。虽然大多数员工的剂量当量有小幅增加，但操作能量大于20 MV的医用电子直线加速器的人员的剂量当量在人员剂量计计划变更的同时翻倍。测量表明，这些人员操作的加速器周围存在少量热中子辐射成分。这种成分导致用TLD - 100剂量计测量的剂量被高估。因此，这些人员剂量当量的增加并非由于工作习惯或辐射环境的变化。胶片剂量计或TLD - 700剂量计都适用于高能直线加速器周围的人员监测。最终选择将取决于经济性和个人偏好。
