e UNCLASSIFIED a a — anma> ° Chief of Engineers, U.S. Arny, the Bwreau of Yards and Docks, and the AEC as specimons of shiolding. These were oventually considered too complicated however and it’ was proposed that a number of plain stecl shields made of 1 inch steel plates, 1 and 2 feet square, capable of being built up by bolting together into any desired thick- ness to be used. It was also requested that concrete slabs, 3 inches in thickness be manufactured at the test site. In addition a quantity of angle iron was procured to be used in mounting these sample shields. Assexbly of the material was made at San Francisco, Naval Shipyard under the direction of LT Vicars, This material was then delivered to Terminal Jsland for transport to the test site, The fi2m method of measuring the amount of gamma radiation was selected as being the most practicable for the purpose of the test. It was decided that the film badges for all gamma measurements be procured by the AFSWP, Dr. Lauriston S, Taylor of the U.S. Bureau of Standards was placed under contract by the AFSWP to calibrate and read film badges for all sarma radiation readings, Decontamination and Heat Sensitivity Studies. The problems associated with handling and disposing of radioactive materials resulting fran atamic bomb bursts had heen one of great concern to the Navy for the previous 15 months as a result of Operation CROSSRCADS. The Bureau of Ships had been assisned the responsibility for development of ship decontamination measures shortly ' after operation CROSSROADS, - 30 -