- r a , Ltds (continued) assumption is made that all of the strontium 90 which falis on the ground is available. One knows that soils have rath pronounced exchange characteristics..j1.can one guess,..eq@ that I would take it that this is a rather pessimistic assuapt and IT was curious as to how pessimistic it is. Have expe ts been done in putting strontium 90 into ordinary soil and Bt finding out what is available? That's what you're doing, im't it, Dr, Larsen? LARSEN: Yes. We have been looking at various shots, and the one piece es. tis of data that is most complete infn the underground, which, most of you probably know, is about a 1.2 KT. What we diff there was to take soil flats froa California soil represcating B inches 4 : LIBEY: in depth, and about h 09. feet cach box was inthis dinerpion, and we distributed this over the territory of predicted fellow. We came back with half of what we hed distributed as contaminated, which we could measure by survey meters, I'11 take one, hich ° represents one of the saxinum activities to illustrate wh tive7 found, We had 196 microcurics totel surface activity on AY, and we have grown § crops of radishes consecutively on | mt and the observed values, for euaple, Go Jamary 1S,1952, we 15.9 disintegrations per second per gram ‘ef plant dry mater ae. the last crop came off in 9/19/52, of radishes, and this re yi | Now the controls that we had growing on the oane soil, b | | without any contamination, read, in this crop 1/15/52 seiftes, it wes 1.69 d/e/gram and over bere 9/15/52 we were gettin: sbout 2. DanBrimert af Tye... Brean Histce : 4 t 2ST