2h . now available give no indication that the extrapolation is not justified ' for making a "safe" estimate of amount of effect produced at low dose. - . Question 3 If the average American body-burden for 1968 is known, what is the consequent whole-body dose which it delivered in 1968? Would that figure represent only the dose from internal radiation? What was the average additional whole-body dose in 1968 from external radiation, and from nuclides passing in and out of the lungs, and straight through the gastrointestinal tract? In your opinion, is the public accurately enough informed if the high, wet-zone doses are averaged together with the lower dry-zone doses? then further averaged out over a 7O-year life span? And Answer The 1968 body burdens of individual radionuclides tabulated and described in reply to Question 2 are converted to. doses in the following table. It should be noted that the doses from radium and from strontium-90 are not whole body doses but are the doses to bone and cannot be added to the other doses. Internal Whole-Body Radiation Doses from All Sources Natural Radioactivity K-ho c-14 Ra-226 Ra~228 Po-210 Rn~222 (dissolved in body) 20 mrads/year 0.7 0.6 0.7 0.3 (2 mrad/yr to bone) 0.3 Artificial Radioactivity-1968 Cs-137 0 Sr-90 H-3 C~14* *1967 dose rate, 1968 should be lower. 9. 0 0 ,