Project 2.72 = Relative Importance of the Various Radiation Sources to the Ship Shielding Problem - H. R. Rinnert OBJECTIVES To determine the relative radiation dose rates contributed by contamination of the air envelope, water envelope, and the ship! weather surfaces, To determine the time dependent gamma ray combined absorption and scattering coefficients of steel to be used in future calculations of shielding effectiveness. To field test new and improved detector systems. To obtain gamma radiation measurements at various points on and 4 in the ship as a function of time for the following purposes: Check points for future shielding calculations, Determination of the radiological situation at various locations aboard ship for Projects 2.63 and 2.10, to be used for operational control of the test ships. DESCRIPTION AND EXPERIMENTAL PROCEDURES Relative gamma radiation dose rates as a function of time from con- tamination resulting from CHEROKEE contributed by the air envelope, water envelope, and ships weather surfaces were to be estimated by means of recording ionization chamber radiation detectors. Detectors were located at several points on and inside of the YAG's 39 and 40. 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 ~ ro “ry CGOPIEDAOOE * ' ANL ae RES - 40 ~