, (¢ SEELTEEERED techatques exployed will te descriled in a forthcoing publication. ha Resultsend Discussion Zae . significant ensuite of beta ani gacra activity were found in the a “yt tissues of 5. Marshal) Iolant fish pnd mrino invertebrates collected ons year after exposure to the fall-out froa Operation CASTLE LE (Tables hii,4.2, end h.3)e Ths distribution of redioactivity in the tissues of the large fish (>150 gs) collectea in tha Rongelap end Roagerik legcons (tert6 4.2) Andicated that opproxtrately LO per cent of the activity was found in 3 the’ eueletons. Muscle contained ezgroxinately 15 per cent and the viscera coz- tained agpraximately 20 per cent of the total internal ectivity. (na- excoptica wea 8 parrot fish froa Enivetek which had en unuevally hia ectivity in tha viscera, probably ecsocisted with recent ingestion of a highly coutaxinated food source. he rensinder of the activity vas found oa the extn and gills. The beta to gamma ratio ves epprocirately uh in East of the tiesues analyzed. Puysical and cherical antlysis of Gna fish initcated that tha high gamma to beta ratio ws largely accounted fer by the induced activity of mn® ena Feo? K-capture enitters. Purther work oa fish is a progress to ses if this sitution ie a migue or gencralited finding... - . a The total eotivity found in the terrs collected oa the yarious etolls (sabe4.2)ves lesa by & fector of ten or more than that of the corres ponding fish‘populations. _ The activity of the terns collected, froa the Roagelep ‘told vos higherthan that of the terns from Rcoaserik Atcli ond considerebly higher thanthe terns frca the Biker Atoll. ‘The redioamilysis of & rocster froa Rongelep Ielend (rents b4) | ATLGSS319