DR. ANSPAUGH: Could I have the first viewgraph? (LRA-19). This is just to reemphasize what Dr. Ng mentioned about the calculation of the dose from ingestion, which was the subject of his presentation. — It's basically the multiplication of these four terms, and the next thing that was to be considered was the estimate of uncertainty; and speaking. specifically about the litigants, we were in a position at the time thatwe made the calculations for the litigants of not having the input from Dr. Hicker 's model in terms of his estimate of uncertainty. we estimated .the’ uncertainty 10 in these estimates based upon a So somewhat different approach.’That's shown in the next viewgraph. (LRA-20). il We made: the assumption, which is quite reasonably justified —_ 12 on the basis of other studies reported in the literature, that all of these 13 factors were lognormal ly. distr ibuted; and we estimated their dispersion, or 14 their geometric standard deviation, as shown on this slide. 15 measurements of mR/hr, 1.5 jis zFeasonable, fairly conservative number of 16 the actual calculated geometric standard deviations that we got from the 1? DRI 18 d/measurement of mR/hr at a particular location. 19 number. 20 that number was exactly known. 21 how to calculate exactly the deposition of a particular radionuclide per 22 unit of external exposure rate. 23 through in a little more sophisticated method, we wil] examine the actual 24 variations in that term. - 25 folks when they looked at “Tocations which had more Now the than one This is our source term For the purposes of this calculationzat the time, we assumed that In other words,that we did, in fact, know Now that is not quite true. As we go — Now this is the one that really drives the uncertainty, the transport 26 through the food chain. On the basis of some work done-by people at Oak 27 Ridge, Hoffman and Baes in particular, they looked at radioiodine transport 28 through a food chain, through the cow milk food chain. 37 Their estimate of