摘要: Pacific Northwest Laboratory (PNL), has developed an asphalt emulsion cover system to reduce the release of radon from uranium mill tailings. The system has been field-tested at the tailings site in Grand Junction, Colorado. Resul... 展开 Pacific Northwest Laboratory (PNL), has developed an asphalt emulsion cover system to reduce the release of radon from uranium mill tailings. The system has been field-tested at the tailings site in Grand Junction, Colorado. Results from laboratory and field tests indicate that this system effectively reduces radon release to near-background levels (< 2 pCi m exp -2 s exp -1 ) and has the properties required for long-term effectiveness and stability. Engineering specifications have been developed, and a cost analysis indicates that asphalt emulsion covers are competitive with other cover systems. 6 references, 2 figures, 4 tables. (ERA citation 09:016078) 收起