The Effectiveness of Various Local Shielding Arrangements Erected Near the Target of the DREO Neutron Generator in Reducing the Biological Hazard at Specific Locations on the DREO Site

摘要

The effectiveness of various forms of shielding near the target of the neutron generator in reducing the dose rate at specific locations on the DREO site has been investigated. It would appear possible to satisfy AECB requirements so far as reducing the dose rate along the perimeter fence bordering the railway right-of-way is concerned, but substantial additional shielding would be required to reduce the dose rate significantly at the nearest occupied building, Building 14. In the latter case, to take advantage of the maximum operating hours permitted by the licence, AECB requirements could be met only by construction of a massive shield around the target, otherwise the cumulative dose inside Building 14 could be monitored and operations terminated when the total dose reached the permitted yearly limit for non-atomic workers. (Author)