Fractionation of Radicstrontuin in Bem Catirss a] ~” 3 a4 ay xs Che two radioisotopes of strontium, Sr“? and Sr°* are chiefly iprmea the decay of primary fission vroducts according to ths schemes, vw. O Kr Kr89 ) 90 Rb sg Roo? 3s oad Tm -.' 1.90 Se sg sr89 Shorts 15,4 m 3 cy 3 “35 a ag ooo ¥ y not be It is therefore possible that the bulk of the radiostrontium produced until the firebali has scoled below tha solidifying ppint of the fallout debris. If this i3 true, the relative amount of SEF ov Sp90 in the close-in fallout should not be as greet as would be preBicted from fission yields, and shouldalso ba quite variable... This confirmed by measurements (Sr85*9O475% ratios) and by most of the results of our owm analyses, oe has _bdeen._. wee The extreme variability of our initial radicstrontium results for faile theds 3 out samples led us to question the precision of cur chemical As a test, three samples of finely powderad Jangleite were r ty the . = 4s ? . same chemical procedure, The relative Sr~- activity was found to de 206, 2.1 and 2.1%, compared with the theoretical value of 5,5) This discrepancy may be possibly accounted for by considering that soma of the initial activity was induced, rather than fission prod met aActivitye In any cass, the orecision of measurement is raasonable and i dicatas that the variability of falleut radiostrontium is real, The fallout samples run for radiostrontiimm wera taken from ou ro stock of Lhas9g ras decay samples from Tumbler-Snapper, Ivy and Upshot~Knothols, sults, along with the theoretical radjostrontium values from Eunter and nm Ballou are given in Tables 4-6, Table 4 TUMBLER: SNAPPER FALLOUT (airborne Dust ) Location Hanksville, U Date Initial d/m ge S999 OF 5/26/52 137 906 106 114 120 16 12. 569 108 74, 847 963 averarce Theoretical ny % 7,0 a, t ley? 15,1 10,5 4,8 967 BO