—< wa ro CD Ze Pry Cc = a “| a) “rT Frank Cluff 2 it Was concluded that some radiation exposure could be avoided turough removal of contaminated serep metal such that it would be unevallable to native collectors. Cojectives - Following the August 1968 trip to Bikini, a report on the viait was prepared by AKC steff containing an attachment addressing the question of purrose and objective for serey remove) at Bikini Atoll. Recommendations 1 through 4 of this ateatement, knows 2s Attachment 6 to that trip report, «ppear to be a proper asseesment of what le needed. 2 Thies Attachment & is provided for your use. Screp Disposal - If cost, time, «nd man-pover were unlimited, dispose! of ali ecray metei containing any induced radicectivity in the very Geep ocean outside the reef would more certainly make the screp unavailsble to the returning matives. More reslisticelly there are e nusber of factors to be considered: Ll. The loeation of with scrap must scrap locetions a 25 to 30 mile channeia. 2. chenneis in the reef through which bosate loeded posa is such that disposal outside the reef for in the northern portions of the atoll vill involve round trip. Currents way be very strong in these Except for e« trgce quantity, the radiconciide in the conteminated metal scrap is “Co with a half-life of ebout five yeare. This moy be compared vith the 30 yeer haif-life of 157Cs which is a major casponent of soil radicactivity of the near test islands. The acrep contesminant will decay through six half-life periods reaching about 1% of tts 1967 value while the 137¢e in soil of the near test islands is being redwed to 50% of its 1967 level. 3. i. Disposal of metel debris, which will sink to the botton, in water , 150 to 200 feet deep inside or outside the lagoon vill make the ecrap unavailable to the netives. Such meterial should not be recoverable without use of special equipment at these depths. The lagoon anf ceean floors in the area of test locations already contain e total quantity of scrap expected ta be in excess cf that found om land. In fact, the sddet quantity from the iand areas would probably be e very email fraction of this total. NEC CUAL FISh Pak rt Tet Pb GMa P ake We wa th |