National Council on Radiological

NCRP National Council on Radiological Protection, Evaluation of Occupational and Environmental Exposures to Radon and Radon Daughters in the United States, NCRP Report No. 78, Bethesda, MD (1984). 

In the United States, the National Council on Radiological Protection and Measurements (NCRP) has recently issued two reports on this subject (NCRP, 1984a,b). The lifetime risks have been estimated and it is predicted that exposures of 2 WLM/y would reduce the probability of living to age 70 by 1.5 and an exposure level of 5 WLM/y would reduce that probability by 4 (NCRP, 1984a). For an average dose to the population of 0.2 WLM/y, the model predicts about 9000 deaths from lung cancer per year in the U.S. population (NCRP, 1984b) for nonsmokers. 

---