page 48 set 5 with 102 of 102 SMFRICIAL USE ONLY Order number 940406-171827-13 from the northern Rongelap lagoon. Most of the activity in marine specimens was contributed by Zr{dup 95}-Nb{sup 95} and Ru{sup 106}-Rh{sup 106}. No fractionation of Sr{sup 89}- Sr{sup 90} occurred in tissue of fish analyzed. Residual soil contamination was confined to top several inches of soil, with movement indicated down to the lens water. The major radionuclide found in the tissues 801. of land animals and plants was Cs{sup 137}. The island soil and lagoon water were contaminated principally by rare earth elements, Ru{sup 106}-Rh{sup 106} and Zr{sup 95}-Nb{sup 95}. Amount of activity in specimens analyzed was generally proportional to external gamma reading in each of the areas. CASTLE/residual radiation ;FALLOUT/uptake ; KEYWORD (S) MARSHALL ISLANDS/radioactive contamination ;PLANTS; ANIMALS ; WATER; SOILS; CASTLE; ENVIRONMENTAL STUDIES; ZIRCONIUM 95; RUTHENIUM 106;RHODIUM 106;CESIUM 137; ECOSYSTEMS ; FALLOUT; UPTAKE Item 85 150. 110. REPORT NUMBER 70. 710. PERSONAL AUTHOR (M) WT--1661 PRIMARY TITLE (M) Proof test of AN/TVS-1 equipment. CORPORATE SOURCE Project 6.14 Scarborough, G.D.; [of] (XE-3) flash-ranging Operation Hardtack Van Sant, J.S. Army Signal Research and Development Lab., Monmouth, NJ (USA) Fort 371. PUB. DATE (YYMMDD) 610124 34. CLASSIF. LEVEL TEXT Unclassified 950.. ABSTRACT (Supersedes ITR-1661) The overall objective of this project was to evaluate the Peerless flash-ranging set, AN/TVS-1 (XE-3), prior to its acceptance by the United States Army Signal Research and Development Laboratory (ASRDL). The specific objectives were to determine the operational capability of two types of automatic shutter-activating units and to compile data on shutter speeds and filter values at different ranges from point of burst of various low-yield nuclear devices. The project participated in eight detonations at the Nevada Test Site (NTS). Consistent, reliable operation of the equipment tested was obtained at 18 miles from burst. This distance was the maximum line-of-sight range that was available for_a suitable observation point. Although both types of dbitomatic shutter-activating units performed equally well under conditions of high visibility such as existed during the test participations, the modified version was varied transmission factors such as existed during the test participations, the modified version was considered most applicable. Camera settings were kept constant, but 5003022 OFFICIAL USE ONLY