can be determined. When the range of exposures is not known, the guide is 170 mrem/yr with exposure determined as an average for the population group. Both of these standards were developed using the assumption that there is no threshhold below which one can be certain there is no radiation injury. The. followup surveillance of the Bikini environment and people is planned to assure that exposures will be known for both individual adults and children. For completeness, there are several additional items that should be mentioned: a. <A question regarding planting coconut in the Peter-Oboe complex. b. Questions regarding any restrictions on digging foundations for houses and whether work crews could drink well water on Bikini Island, ce. Followup items from the Ad Hoc Committee recommendations relative to a dietary supplement of powdered milk and removal of soil for planting pandanus. Answers to questions in (a) and (b) above were provided in a letter to High Commissioner Edward Johnson dated June 17, 1971. This guidance specifies that coconut may be planted in the Peter-Oboe complex except for the island of Tare (Eneman). There are no restrictions on digging foundations on Bikini Island and no radiological restrictions on use of well water on Bikini Island. A copy of the letter is provided (Enclosure 13). The question of the best way to provide a calcium supplement to the diet for people living in Bikini Atoll that will be acceptable to both TT ETE