Table 3.
Test results of Radon (Rn-222) concentration of WML board

Items Max. Rn concentration (Bq/m3) Avg. Rn concentration for 7days (Bq/m3) Radon concentration per unit mass (Bq/(kg•h)) Radon concentration per unit area (Bq/(m2•h))
3-layer WML 21.3 12.9 0.008 0.019
Criterion - Below 148 - -