BNL |] BROOKHAVEN NATIONAL | 4Ue 30 ORY AU] associateot ve ee tbe 975 SAFETY & ENVIRONMENTAL PROTECTION DIViSICN f TeLEPHOKE: (516) 345- 2,25 de . La7é Mr. T. F. McCraw USERDA/SS° Washington, — . Dear Tommy. The trellowing : a vreliminars : o* the external radiation survey res cs vor Wotte, Allis tivik, and Rongelap Atolls, ‘Other deters: Tomne® ere to mie soa survex are included in mv ° Peper, Ff a bo bets do se.ectet avbitrarive: Worse | gamma backgrouic " wrtrels! At ie average of al! pre-siri ec 1on i aamte + O.4 URf/hr. (plus cesmic hrs riv The averaie and Aiiuk Jsianc as ‘ese Locations, rhe arma readings was 3.8 crrespends 1. Tos re er ocs .. +t Island ins oe Tee oody 2amma : ites i’ arr CyeTage bepoooar » wR bri .isted helow. Annual Exposure (mR) Utirik Eorukku Aon 36 37 36 At Rongelep sirvvess were corner of the et >. atell: ta + oS. ure in all t: Eniaetok Islane mMicwayv clong locatiors (1° Rongelap 9% islands were tec ve eProgenecus tor age" exposure rate 41'°. "his ure x island, however, wa. 'Ficpent to estimate an average 6 st ste ' Ls about twice Unerua. v2ackeie. a TEcenciattneee Aaterm net eeae and slightiv tress * a proor. So & .aiad .n the nerthwest ou Ftteast corner - oud Reagelap Island .ammna fields over the vomace an “island averw t the cata. Rongetap ba ‘lage feast end) vt promo mR vr, which © ar.nated Marshalls, eee erates a ame mane, oo om + , reoorp Leng Tsiane.