Preliminary studies on lower limits of detection for gaseous radioactive effluent based upon risk-based approach

In order to regulate the effects of radioactive effluents, the provisions of radioactivity concentration and offsite dose are used in domestic and abroad. In order to obtain the reliability of the measured radioactivity concentration and offsite dose, the sensitivity of the Lower Limit of Detection (LLD) should be secured at a certain level or more. If radioactivity concentration or offsite dose measured using LLD which is not secure the appropriate sensitivity, the accuracy of results cannot have sufficient reliability. For the proper monitoring of the released each nuclide, LLDs are prescribed in domestic and abroad. Cheong proposed the deriving methodology of risk-based detection limits for liquid radioactive effluents [3]. That methodology derives the risk-based detection limits using the level of contribution to both radioactivity concentration and offsite dose. In this study, proposing the deriving methodology of risk-based LLD for gaseous radioactive effluent. Also, deriving the risk-based LLD and confirm the validity of risk-based LLD and present LLD using the APR1400 case