page a7 ase 8 wach 102 of 102QPRICIAL USE ONLY Order number 940406-171827-13 83 Item 150. 110. REPORT NUMBER 70. 710. PERSONAL AUTHOR (M) NRDL--455 PRIMARY TITLE (M) Residual contamination of plants, animals, soil, and water of the Marshall Islands two years following Operation Castle fall-out CORPORATE SOURCE (USA) DATE (YYMMDD) 371. PUB. 34. CLASSIF. LEVEL TEXT 950. ABSTRACT Weiss, H.V. Naval Radiological Defense Lab., San Francisco, CA 560815 Unclassified The amount and distribution of radioactive material remaining on several atolls and incorporated into plants and animals of the Marshall Islands was determined two years after their contamination by fall-out from the March 1, 1954 nuclear detonation of Operation CASTLE. Readily detectable amounts of radioactive contamination were found in animals, plants and soil. Most of the activity in the edible portion of piants and soil. Most of the activity in the edible portion of plant specimens was contributed by cesium-137. The major radionuclides found in the tissues of fish was zinc-65, and that in clams, cobalt-60. Residual soil contamination remained confined to the 801. KEYWORD (S) surface. CASTLE/residual radiation ;FALLOUT/uptake ; MARSHALL ISLANDS/radiocactive contamination ;PLANTS; ANIMALS; SOILS; CASTLE; ENVIRONMENTAL STUDIES;FALLOUT; UPTAKE; CESIUM 137; ZINC 65;COBALT 60;ECOSYSTEMS Item 84 150. 110. REPORT NUMBER 70. 710. PERSONAL AUTHOR (M) PRIMARY TITLE (M) CORPORATE SOURCE NRDL--454 Residual contamination of plants, animals, soil, and water of the Marshall Islands one year following Operation Castle fall-out (USA) DATE (YYMMDD) Rinehart, R.W. Naval Radiological Defense Lab., San Francisco, CA 371. PUB. 550812 34. CLASSIF. LEVEL TEXT Unclassified 950. ABSTRACT The amount and distribution of radioactive materials remaining on several atolls and fneorporated into flora and fauna of the Marshall Islands was determined one year after their contamination by fall-out. Significant amounts of radioactive contamination were found in animals, food plants,, water and soil samples. Highest concentrations of internally deposited activity were found in marine specimens taken 900342 I OFFICIAL USE ONLY