SECTION 1 1.1 BACKGROUND 3 'F » ‘ In Part I of this series of reports,+ decontamination equations were presented in which the decontamination effectiveness was shown to depend upon the initial level of fallout. The initial level of fallout deposited on surfaces was given in terms of mass per unit area, atoms per unit area, or in arbitrary C-Level units. These generalized units of the initial level of contamination were used as independent variables in the equations without direct reference to a gamma radiation level. In order to relate the generalized or real contamination level to radiation levels, conversion factors, such as the mass contour ratio, were introduced to indicate a conversion of the basic units of measure to gamms ionization rates at 3 feet above an extended contaminated sur- face. The effect of the detonation conditions on the decontamination ratio presented in Part I of this series will be discussed in Part III. In this report, the dependence of the conversion factors (called contour ratio scaling functions) on the conditions of detonation such as yleld, height or depth of burst, type of weapon, and other parameters are discussed. If these are known, then the dependence of the decontamination ratios on the same parameters, in turn, can be determined. NV. Note: DOENr E/N The author wrote this report before he left this Laboratory on 11 August 1960.