为即将在澳大利亚北部干湿热带地区恢复Ranger铀矿,确定了用于环境放射防护的土壤指导值。在修复的地貌的拟议废石基质中,指导值为(226)Ra的1000Bqkg(-1),对应于最高暴露量的100μGyh(-1)的高于基线的剂量率限制生物的个体。基于使用特定位点浓度比数据的评估,限制性生物是爬行动物。
A soil
guideline value for radiological protection of the environment was determined for the impending rehabilitation of Ranger uranium mine in the wet-dry tropics of northern Australia. The
guideline value was 1000 Bq kg(-1) of (226)Ra in the proposed waste rock substrate of the rehabilitated landform and corresponded to an above-baseline dose rate of 100 μGy h(-1) to the most highly exposed individuals of the limiting organism. The limiting organism was reptile based on an assessment using site-specific concentration ratio data.