gum ARB 3012109 Project 2.71 - Relative importance of the Various Radiation Sources to the Ship Shielding Problem - H. R. Rinnert OBJECTIVES To determine the relative raiiation dose rates contributed by contamination of the air envelope, water envelope, and the ship's weather surfaces, To determine the time dependent gfamna ray combined absorption and scattering coefficients of steel to be usei in future caleuletions of shielding effectiveness. To field test new and improved detector systems. 4 To obtain gamma radiation measurements at various points on and in the ship as a function of time for the following purposes: Check points for future shieliing calculations. Determination of the radiolozical situation at various locations aboard ship for Projects 2.63 and 2.190, to be used for Operational control of the test ships. INSTRUMENTATION Relative gamma radiation dosegpates as a function of time from contamination resulting fro (Fr-Tm@mAD) contributed by the air envelope, water envelope, andi shirs weather surfaces were to be estimate? by means of recording ionization chamber radiation detectors, Detectors were located at several points on and inside of the YAG's 39 and 49, Time dependent gamma radiation combined absorption and scattering coefficients for steel were to be determined by means of recording detectors inside steel pipes having wall thicknesses ranging from (uP £9 Dot Lin, RE pe - 31 - : AWG 7N a