6.4 SYNTHESIS OF SIMULANTS FOR DECONTAMINATION TESTS Characterization of the contaminants from the surface land and water shots has furnished information needed for synthesizing simulants for laboratory decontamination studies. For the surface land shots the composition and physical characteristics of the fallout were documented adequately, A relationship between the radiation level and the quantity of fallout per uni* area was established. The physical nature of the fallout from surface water shots is somewhat uncertain but its chemical composition and radiochemical properties were determined, The ratio of radiation field to the quantity of fallout per wit area is mich lower than that for the surface land shots, 6.5 PROOF TESTING AW COUNTERMSASURES FOR SHIPS The information regarding the nature and distribution of the fallout has been useful to Project 6.4 in interpreting the effectiveness of the countermeasures on the YAG's. A knowledge of the chemical and radio-~ chemical properties of the contaminant aided in their decontamination studies. Information regarding the physical properties of the aerosols was used in determining the effectiveness of various protective systems for the ship's ventilation air. The rates of decay and energy measure- ments of the fallout from the various shots have been useful in evalrating the data from the radiation detection devices aboard the ships. This information is also useful in determining the shielding provided by the ship's structure,