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Radiological Dose Assessment for a Regulatory Clearance of the Soil and Concrete Wastes at KAERI

At the KAERI, about 4,800 drums of radioactive contaminated soils and concretes wastes have been stored since their generation in 1988. As these wastes have been stored for more than 18 years, some of them can be regulatory cleared. Before such a regulatory clearance, the radiological characteristics of these wastes should be analyzed first. And based on the analysis result, radiological dose should be estimated to confirm the safety of a disposal of these cleared wastes. In this study, a working procedure for a representative sampling and analysis of the wastes was developed. According to the analysis result, Co-60 and Cs-137 were major radionuclides while some wastes were contaminated with Mn-54, Fe-59, I-131, Cs-134 or Eu-152 of an extremely low concentration. The analysis results show that about 75% of wastes have a radioactivity concentration below 0.1Bq/g and were considered for a clearance. It was assumed that radiation workers are exposed by the inhalation dose and the external dose. The radiological dose was estimated using the RESRAD code for the disposal workers and the management workers as 5.32µSv/yr and 3.13µSv/yr for an individual dose and 1.60E-4 man · Sv/yr and 3.13E-5 man · Sv/yr for a public dose, respectively.