seen and the uranium, fallout, in this case, as well, as if we talk about global it's mainly due to thermonuclear explosions which produce a very large neutron flux and substantially change the ratio of plutonium-240 to -239.. Now, from the Test Site, we essentially have all fission devices that did not produce such large neutron fluxes, so that's the basic reason why the- ratio of plutonium-240 to -239 is different for the Nevada material as opposed to global fallout. The next viewgraph (LRA-45) are some material from EML that I won't go through in any_gfeat detail. It's been presented a couple of different 10 times, but, just ta emphasize that this technique has been worked out by 11 EML that you can cateulate the ratio of (total) plutonium from Nevada to 12 that of global 13 the ratio of plutonium-245to -239 in your sample and then you know what it 14 should be for global falloutand what it should be for Nevada fallout. 15 Going through this arithmetic,—you ran calculate on the basis of these 16 measurements 17 global 18 provided us as the constants for the Nevada fallout and for the global 20 and fallout 19 fallout. if you measure several different things and that includes those in knowns, theratio of that sample, andthese are plutonium the from values that EML and has You see that the ratio from the twe-sources differs by about a factor of 6. . The next viewgraph (LRA-46) is simply an extension of that. 21 Nevada The other 22 equation is that the total plutonium in the sample has to represent the sum 23 of the two sources; combine that equation with theather one, and then you 24 can come up with the amount of global fallout in that—sample and then, what 25 we really want is now this number, whereas if we know the global plutonium 26 in that sample, 27 plutonium in global fallout, shown there, and then we can, indeed, calcu- 28 late this and also the total cesium, we know theratio of cesium- number, which is the number 191 we need to drive our dose