Table 2: Activity concentration ²²²Radon and ²²²Radon progeny (in Bq/m³), ²²²Radon individual dose cumulative (work level months), excess lifetime cancer risk, International Commission radiation protection biological effects of ionizing radiation (National Research Council) VI – total group of population in occupational exposure, never smokers, exsmokers, and smokers^{[2],[10],[11],[12],[13]}