62 RADIATION STANDARDS, INCLUDING FALLOUT SR-90 INVENTORY May 1961 MEGACURIES N. Hemisphere Stratosphere 0.45 S$. Hemisphere Stratosphere 0.52 World Troposphere 0.03 Total Atmosphere 1.00 Deposited on Ground 42 Total 5.2 FIGURE 1, SR-90 INVENTORY Megacuries May 1960 Nov. 1960 May 1961 Observed world wide distribution Available for world wide deposition* 5.3 5.3 5.2 9.9 9.4 9.3 "Based on 9.2 less 3.0 (?) megacuries of focal fallout and radioactive decay FIGURE 2. or a Protea arate SPSLet thaaksedpeetetasedacehintece tet cdcThaAngbettaRELARORE OH,

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