White J M
Am Ind Hyg Assoc J. 1980 Jan;41(1):49-60. doi: 10.1080/15298668091424348.
In August, 1975, the Ministry of Health of the Province of Ontario at the request of one of the tenants of a building in a large Canadian city conducted a radiation survey of the third floor of the building. The survey, although preliminary, showed that high radiation existed on the third and second floors and that significant contamination existed in some other parts of the six-floor building. The contamination was identified as radium-226. An investigation revealed that the third floor of the building had been used during World War II for processing radium and also for some radium dial painting work. The Atomic Energy Control tboard (AECB) requested Atomic Energy of Canadian Limited (AECL) to remove the radium contaminant from the building. AECL assigned the job to its Chalk River Nuclear Laboratories (CRNL). The objectives were to reduce the radium concentration throughout the building so that radon decay products would be less than 0.02 Working Levels (WL) and exposure rates would be less than 50 microR/h. The techniques used and the extent of decontamination achieved are reported.
1975年8月，安大略省卫生部应加拿大一个大城市中一栋建筑物的一位租户的请求，对该建筑物的三楼进行了辐射调查。此次调查虽然是初步的，但结果显示二、三楼存在高辐射，且这座六层建筑的其他一些区域存在显著污染。污染物被鉴定为镭 - 226。调查发现，该建筑物的三楼在第二次世界大战期间曾用于镭加工以及一些镭表盘涂漆工作。原子能控制委员会（AECB）要求加拿大原子能有限公司（AECL）清除建筑物中的镭污染物。AECL将这项工作交给了其查克里弗核实验室（CRNL）。目标是降低整栋建筑的镭浓度，使氡衰变产物低于0.02工作水平（WL），暴露率低于50微伦琴/小时。报告了所使用的技术以及去污所达到的程度。
