C: 6 Having this bacnground notice iat tusen lucg Lrissuc has a well known carcinogenic potential under a number of situations, including c..posure to jonizing radfaticns; and thot in the Hanrord dug scudy induction oO hrnt bik o 6 These to establish pluto niun induced Jung cancer es a , are a sufficien ct of lung cancer was observed after exposure to plutonium aerosols. “Jegitimate concern for humans. o™ The follc.ing is a review of the official guidance for estimating the carcinogenic cffects fron exposure to radioactive particulates. I. "(210) The NCRP has arbitrarily used 10% of the volume of the organ es the significent volume for irradiation of the gonads. There are seme cases in which choice of a significant volume or area 1s virtually meaningless. . For exemple, if a sinal particle of radioactive material Tixcd in either Tung or lymoh node may be carcinocenic, tne averaging of Gose cither over the juna, of ene cubic centinzier may have littie to Go with the case. Use oF sicnificent Volonre oF ere. 5 “ust be inched c7 es ome of the round off devices waich in special cases must give way to detailed stucy.” ° NCRP Report #39 Basic Radiation Protection Criteria January 15, 1971. (emphasis added) .>» = ee ; iste Syiat ( te a :