5. * 6G. Seaeeee 3 Disposal inside the reef would make scrap removal operations less weather and wind dependent since trips into open water and possibly into roucsh seas would not be needed. nae gprs Frank Cluff The identification of metal scrap containing induced radioactivity and requiring disposal must be made under field cone aitions using portable radiation detection instruments anG in most cases in the presence of an elevated above ground gamma radiation field. The identification of hot spots in soil will take place under similer circumstances. With these factors in mind it is suggested that the following guide-~ dines be applied: 1. A careful search should be made for all contaminated scrap that may be collectable by the returning natives. Ecrap metal con- taining induced radioactivity and showing contact readints incasurable ebvove local background should be collected for disposal. The need for removal of other materials such as soil from any hot cpots contsinint plutonium or other radionuclides will be a matver for case-by-case determinations in the field with recommendations made by the AEC Radiological Safety Advisor. 2. Disposal of metal scrap containing radioactivity in water having a depth of about 150 to 200 feet will make these materials une available to the native population. These depths are approxie- mately equivalent to the deeper parts of the lagoon. 3. A disposal site for each of the three near test areas, as described on page 1, containing the contaminated scrap may be chosen inside or outside the reef with a minimum distance of one mile to the nearest islend or islet. <A record of positions should be made and included in final reports. If any merkers are used they should be removed at the end of cleanup operations. 4, Considering the possibility of future salvage of ships, metal scrap containing induced radioactivity is not to be placed within the prohibited area located in the east end of the lagoon (refer to H. 0. 6032 published by U. S. Naval Oceanographic Office). 5. Except when collected by those authorized to do so, no samples of metals containing induced radioactivity are to be retained or transported from Bikini Atoll.