Article Annexe 13-8 of the French Public Health Code
Appendix 13-8 Table 1 – Natural radioactivity in solid materials Natural radionuclides Exemption limit value in concentration (kBq/ kg) K-40 10 U-238 and its radioactive progeny (1) 1 Th-232 and its radioactive progeny (1) 1 (1) All radionuclides in the uranium 238 and thorium 232 decay chains are considered to be in radioactive equilibrium with their parent. In the event of radioactive imbalance following industrial processing, take the parent radionuclides…