POTASSIN™M AND CESIUM-137 IN BIRQUS LATRO (COCONUT CRAB MUSCLE COLLECTED AT RONCZELAP ATOLL INTRODUCTION Rengelap ‘201! was contaminated with radioactive faiteui reseiitag from the Bravo ieat on March i. 1¢64, to me exten! thal \* wad asces sary we evacuate the pepulaetioa of 632 Roageiapese Some 369 Marsha!- te@e returned te Reagelap in June 1887 after the area hed Beam daeciered safe jor narean hebitation Siace i854. there have been several serveyse te determine Me iev>' of radioactive comtam ination of the biets af Rengelep Atoll (Dunniag, 1957). ln Mereh 1958. 0 lomg-term etedy of the eosingy of the atoll. relaétve to radioeetive contamination, wae iaitiated at ine request of the U §. Awmte Energy Commiesion, Divistos ef Bictegy and Medicine Tre Gejectiw of «3 Investigation wes to determine the radtoces lus and stable potassium content im tee men. of Biry.s latro (coconut crab) and tO evalusio the relationship detweea the ‘wo, ‘J any, under the ex- isting eoaditione at Rongeisp Alelt Birgae latro, the coconut crsh, is ef particular interest becasse it is edtble and is a lend crab known to cciutain cesium-1}37 ia ite musete tigeue «Casium-!37 te also the principal leag-lived (27 years half iife) ftseicn product found in plants om coataminated isiands in the | eemedntineee: atin utes Marshall nmetctennteeeitaeE:

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