Table 14. Supervising Scientist position on proposed Radiation closure criteria RMCP reference Radiation criteria Assessment outcome Relevant Rehabilitation Standard Using the agreed restrictions on land use the total R1 Accepted Public Radiation Projection: above-baseline radiation dose from external gamma exposure, inhalation of radon decay Dose constraint: 0.3 mSv in a year effective dose to members of — products (RDP), inhalation of dust and ingestion of the public is ALARA below the dose constraint for conditions of bush food (including water), (shall not exceed) 0.3 agreed future land use. mSv per year. Should land use restrictions fail the R2 Accepted Public Radiation Projection: radiation dose from external gamma exposure, inhalation of RDP, inhalation of dust and Dose 1.0 mSv in a year effective dose to members of the — ingestion of bush food (including water), (shall not public is ALARA below the dose limit for conditions of future land exceed) 1 mSv per year. use different to those agreed. Total above-baseline radiation dose rate to R3 Accepted Environmental Radiation Projection: terrestrial plants and animals from internal and external exposures (shall not exceed) 100 h–1 Environmental reference level of 100 h–1 for terrestrial μGy μGy to the most highly exposed terrestrial species. organisms absorbed dose rates to the most highly exposed — individuals are ALARA below the environmental reference level Total above-baseline radiation dose rate to aquatic R4 Accepted Environmental Radiation Projection: plants and animals from internal and external exposures (shall not exceed) 400 h–1 to the Environmental reference of 400 h–1 for aquatic organisms μGy μGy most highly exposed aquatic species. absorbed dose rates to the most highly exposed individuals are — ALARA below the environmental reference level
Table 14. Supervising Scientist position on proposed Radiation closure criteria RMCP reference Radiation criteria Assessment outcome Relevant Rehabilitation Standard R1 Using the agreed restrictions on land use the total above-baseline radiation dose from external gamma exposure, inhalation of radon decay products (RDP), inhalation of dust and ingestion of bush food (including water), (shall not exceed) 0.3 mSv per year. Accepted Public Radiation Projection: Dose constraint: 0.3 mSv in a year — effective dose to members of the public is ALARA below the dose constraint for conditions of agreed future land use. R2 Should land use restrictions fail the radiation dose from external gamma exposure, inhalation of RDP, inhalation of dust and ingestion of bush food (including water), (shall not exceed) 1 mSv per year. Accepted Public Radiation Projection: Dose 1.0 mSv in a year — effective dose to members of the public is ALARA below the dose limit for conditions of future land use different to those agreed. R3 Total above-baseline radiation dose rate to terrestrial plants and animals from internal and external exposures (shall not exceed) 100 μGy h–1 to the most highly exposed terrestrial species. Accepted Environmental Radiation Projection: Environmental reference level of 100 μGy h–1 for terrestrial organisms — absorbed dose rates to the most highly exposed individuals are ALARA below the environmental reference level R4 Total above-baseline radiation dose rate to aquatic plants and animals from internal and external exposures (shall not exceed) 400 μGy h–1 to the most highly exposed aquatic species. Accepted Environmental Radiation Projection: Environmental reference of 400 μGy h–1 for aquatic organisms — absorbed dose rates to the most highly exposed individuals are ALARA below the environmental reference level
assessment-report-ranger-closure-plan-2018.docx