ead genes and chromosomes pinned down within a factor -=- why should they want this within a factor of two? (Leughter.) And meanwhile, we are doing the best we can and they say it isn't good enough and I get kind of mad. If someone can come up with a better method, with a number of roentgens over a four year period, well, it will be all right. Well, we put those gummed papers in originally becauce it was about the only thing that was administratively feasible, Hanson Blatz hit on the idea that originally we'll try it out for a few days to tell us where the fallout was occurring and where it wasn't occurring. We thought at that time ~ this was 1951, this wouldn't be good ehough, We never thought we would want to use this data quantitatively. Fortue nately, those gunned papers have worked out very well, @ For the pnst two years we have bsen wondering about the absolute efficiency and we have two ways in which we can gauge that and I call on Doctor Brandt to discues the

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