The estimate of committed dose equivalent for the former Bikini adults is shown in Table Four. I used a bilateral convolution integral to relate the 41 I used four different fCi urine activity concentration to t;tal activity. systemic excretion models, three of which were from the literature and were in relative agreement. The fourth was ?resented by Moss during the 29th Bioassay Conference in Seattle, Washington, on October 12, 1983. MOSS reviewed the human injection studies which formed the basis for the Langham power function model. MOSS indicated the Langham nodel underestimated urinary excretion of Pu especially at longer times past intake. I plan to present the calculations in detail on August 16th and review ‘ PERALS results with you. I will re-examine Pu results obtained in previous years and examine two other intake scenarios, continuous declining intake and continuous increasing intake. our We feel the committed dose equivalent estimates should be judged with some caution because they e based on a few recent Pu results. We ourselves 2?6 have questions regarding Po activity found in one comparison sample. We recognize there are different opinions regarding systemic excretion of Pu, different opinions regarding committed versus annual dose equivalent and different views regarding the importance of total bone volume dose versus bone surface dose. I have plotted bone surface annual dose equivalent, as estimated using the four above models, on Figure Two. The assumptio~lwas constant continuous intake at a level in agreement with the 41 fCi 1 excretion of Pu measured in Bikinian’s urine. I eXpeCt many qUeStiOrE to be generated and will supply mare at the meeting. Best regards. ~L~ior~Lat;~n Sincerely, Edward T. Lessard Program Manager Marshall Islands Radiological Safety Program ETL/lg cc: R. Ray J. Baum 3 ““ .