«55 It is expected that two or three trips a year will be continued, with four or five professional staff participating on each trip. If circumstances require (e.g,, including - all resettled Enewetak people, other atoll peoples), additional effort may be required. Environmental monitoring is conducted on the atolls of Enewetak, Bikini, Rongelap and Utirik, Included are studies of radio- nuclide transport mechanisms and exposure pathways to man (e.g,, foods and food chains) from both the terrestrial and the marine environments, Also included are studies of the dietary components on the several atolls, At present, these efforts require four trips per year to the Enewetak and Bikini atolls, and two trips per year to the Rongelap and Utirik atolls, Depending upon the specific purpose of each trip, five to seven professional staff persons participate. These trips result in 2000-3000 samples of various types being returned from analytical examination each year, It is expected that the current program will be continued, and that some modest expansion may be projected due to (a) additional studies at Enewetak after the people return, and (b) possible increased effort at other atolls (unknown at present) as radiological findings and circumstances dictate, Individual and population dose assessments are based upon the actual measurements of radionuclides in residents and in the environment, These assessments provide the bases upon which decisions are made with respect to the acceptability er unacceptability of various living patterns, residence locations, food consumed, etc.