PRIVACY ACT MATERIAL REMOVED” percent. We also note the most important contributions to the lower large intestine, which is of interest because it's the organ that receives the second highest internal doses by ingestion, and the bone marrow dose, which is of interest because of the abundance of leukemia diagnoses. Thus, among the radionuclides that contribute five percent or more of the dose to the lower large intestine, are neptunium-239, strontium-89, zirconium-97, barium-140, and neodymium-147. yttrium-93, We recently added yttrium-93 to the list of nuclides because in reexamining our screening calculations we noted that Y-93 did, indeed, contribute some two percent or more of the 10 total lower large’ intest ine dose. 11 that 12 contributing over 60 percent” to the total dose. 13 cesium-137, barium-140 contrfbute some five percent or more. 14 contributed The next the most viewgraph For the bone marrow, among the nuclides are strontium-89, (LRA-8) “shows a strontium-90, collectively lodine-131, tellurium-132, similar distribution. Well, it 15 shows the most important contributors to the thyroid dose to . 16 from all 1? distributing radioactivity over St. George. 18 quite similar, as shown on the previous viewgraph (LRA-7), and this is not 19 surprising since HARRY was the major contributor to the total dose from all 20 events. events. Again, 21 I will Six of the 31 events contributed doses go through this quickly, by virtue of Fractional contributions are the most important contr ibu- 22 tions to the thyroid dose are from iodine-131, tel lurium-132, and iodine- 23 133; 24 lower 25 zirconium-97, 26 contributors again to the bone marrow dose are strontium-89, strontium-90, 27 iodine-131, tellurium-132, cesium-137, barium-140. 28 and, serially, large the most intestine barium-140, As another example, important are and contributors neptunium-239, 13 the dose strontium-89, neodymium-147. the next viewgraph to (LRA-9) to the yttrium-93, The “most summarizes important the dose