a (Continued) HILLs sample soils. This is chenically a very difficult probl Take a berrel of dirt and treat it. ZI have just a few more rensrks. Tine is getting short maybe I had better put them on. On the basis of this it is to ask!are there any lessons here as far as a present eatimate of the worldwide hasard? If you go on the assu-ption . Strontium 90 is the dangerous character, it is of inter te calculate the total ancunt which has been produced in all| the bombs that have been shot. Actually, I did adjust for t that have been shot in the 0.5. This gives approxinatelyl 9 kilograms of Strontium 90 that has been produced since Almagordo Shot. If you calculate the concentrations rer g$quare mile you get, say, kO to SO micrograms per square mile. | looking at the results here on the worldwide Ivy you see the ratio here can be rather large from the maximus, say, ito the average which ie almost 100. Also, you will have areas will have almost none as ig indicated by some of the falle cut observed. So that this eceuld be a wide range locallyd: Rowaver, Dr. Mitchellhes nade an estinate and he vill about this later, I just put it eut for comperison that 1 micrograzs of Strontium rer square mile gotten into the bibsphere and into man and uncer equilibrium conditions over a 20 ye period would be about tolerance level on tha basis of - was it, about 6x10microcuries fixed in the skeleton? MITCHELL? Micrograms, in other words //3