BROOKHAVEN NATIONAL LABORATORY CHE ASSOCIATED UNIVERSITIES, INC. Upton, Long Island, New York 11973 Safety & Environmental Protection Division R 410001 (516) 282. FITS 666% 4959 September 14, 1984 Dr. William Bair, Ph.D. Battelle Pacific Northwest Laboratories P.O. Box 999 Richland, WA 99352 Dear Dr. Bair: Thank you for the opportunity to discuss plutonium dose calculations. have some additional information which I would like to pass on to you and other persons who were present at the meeting. I Our current estimate of Pu activity in the urine of former Bikinians is now 5 fCi. This is less than the 12 fCi reported by me at the meeting because a longer counting of the sample has allowed better statistics. Keith Eckerman has noted an error in my meeting notes regarding the Moss retention function. I have corgected this and the last exponent in the Moss function should read -4.8 x 10° t.. This correction leads me to conclude that the Moss function is comparable to the ICRP, Leggett and Durbin functions. I have reworked the former adult Bikini resident's estimated 239py committed dose equivalent. I based it on 5 fCi in urine, constant continuous intake and ICRP 30 values for committed dose equivalent per unit uptake. Model Bone Surface rem . Liver Red Marrow Effective ICRP 30 15 3.0 1.1. 0.79 Leggett 20 © 4.2 1.5 1.1 Durbin 20 4.2 1.5 1.1 Moss 10 2.1 0.77 0.55