3rookhaven National Laboratory commenced environmental monicoring of the Marshall Islands for radioactivity in April 1974. Since then, members of the 3NL statf have made a total of six field trips to the Marshall Islands co collect a representative cross-section cf vegetation, animals, fruits, soil and water found on the islands for the purpose of assessing the radiological efiects of the U. S. Pacific Testing Programs. The surveys covered X<wajalein, Wotho, Bixini, Rongelap and Utirik atolls. A cocal of 1200 analyses were performed on 400 samples. were analyzed for Sr-90, Pu-238, Pue259/240 Isa general, all samples and any gamma emitters which may have been present at the time of analyses. Mose of the field sampling work was done in conjunceion with and in cooperation with a related envirormencal monitoring program operated by the Laboratory for Radiacion Ecology (LRE) of the University of Washiagton. The results of both programs will be published in a series of joint and separate reports, with emphasis on the terrestrial environment from BNL, and emphasis on the marine foed chain from L2E.