= ee Se at ee ee ee | tone Ov OF Sil os es r - “—— oh tee neni. penalSc seatinte tineidiltmeneniied ; : * ~ 7 : ~ “a. - Hs nemetapa AEE ee AEAOI A RO 7” : : . ee . aeAte mee : “6. (3) . . a a aes Zoak Sans rant > = . . -e he - An extensive radiation survey of the islands of Bikini ° Toth meets Atoll has revealed several interesting features of the residual environmental radiation fields in *heavy Tecan AyEE 5 “ fallout area a number of years after the initial depos ition: | ‘Bikini Atoll»is the former weapons test area in the mid— oe ge a - ee + Page ff Pacific where more than 20 nucleartests: were conducted from. 1946 to 1958. The survey, conducted in May 1967, included__ measurements of the external radiation levels and determina- ~-=.seeee E- tion of the principal isotopes contributing to the total ~~. rrp nee 7M EOP yecomaa9 An ee external exposure rates on each island of the atoll. Because of the high intensity of the radiation fields generated by £ the tests, we were able to detect at the time of this survey & f many Long-lived fission and activation products which were 7 undetectable or unnoticed in previously surveyed fallout areas because of their trace presence. ot It was also possible > ree peepoaerems - paneerPe tate Som Pera t% to relate the residual radiation fields onthe atoll to various locations of test ground zeros, to ‘meteorological eA hm . 2 conditions affecting local| Fallout ‘at the time of the tte Reuss SF ah, and to weathering and radioactive decay processes occurring: subsequent-t0 the cegsation, of testingactivities, —-s-nset se oe ae Ep Ag to ee ae tahoeEe mo BoSs a apeie oe, igs age pte Seas as Sv owe, “SR ” eae eae Be 4 oe ope tat =the mt om a me ov Cea, SFR mS : i Oe feta wee a. “eee RISreas we La ging of ERS “ Ve wn Stage dees SReepoet ate “goers 0 ae wae oe “SZ meeps . 7 < aay : . . . sore . 7 arte *a , ns co 2H a: ye