they were based upon measured air concentrations. you a total pCi/m3. That measurement gives Then you multiply by the length of the sampling in hours; multiply ‘by a breathing rate which is age specific, of course. we want to calculate for a particular radionuclide. Hicks' source term calculations. Then We go back to Harry For any radionuclide, we can look at the ratio of that radionuclide to the total activity; then that multiplied by this, of course, then gives us the activity of a particular radionuclide; and then, again, our dose factor. Again it depends on human metabolism and is an age specific number. LO Well, the-key thing here is then this measured air concentrations, and 11 the next viewgraph (LRA-22) we've gone through before. Our preference is 12 to use data collected by this device, which is a Casella cascade impactor. 13 It has four stages followed by an after-filter so that we typically were 14 able to recover data as shown ‘tn the next viewgraph (LRA-23) where we have 15 the raw log sheets from Los Alamos now where we have the count data for 16 each one of these five stages. 17 data to make our calculations. We have actually gone back to this original | 18 Now the problem with this data, or one problem with this data, is that 19 what is shown here in terms of the diameters is not an aerodynamic diameter 20 that we want to enter the 21 through and recalculated these diameters. 22 . 23 ICRP lung dynamics- model with; If I could have the next viewgraph (LRA-24). This is again some of the raw data that we find in the files from Los Alamos. trace 24 original 25 calculated out to have a median diameter of 42 microns. in of their the activity calculation. and 26 errors 27 dramatic change on some of these numbers. 28 But, nevertheless, as I It their makes attempt slight so we have gone to fit. This is their This one was ‘We have found some corrections. It has a We get our calculation of 18. indicated, we have found more accurate calibration 39