PD ISO/TS 11665-13:2017 Measurement of radioactivity in the environment. Air: radon 222. Determination of the diffusion coefficient in waterproof materials: membrane two-side activity concentration test method
2017PD ISO/TS 11665-13:2017 Measurement of radioactivity in the environment. Air: radon 222. Determination of the diffusion coefficient in waterproof materials: membrane two-side activity concentration test method