30 Jo] tT | | ro | Sr9° MC/SQ MILE 20 -— 10 bres U.S. STRATOSPHERIC 7945 — ott $948 1949 1950 4954 4952 4953 1954 4955 | | 1 4956 4957 4958 Fig. 7— Predicted Sr® fatlout curve; total fallout 35°N—45°N. 30 | | | | | | S39 mc/SQ MILE 20 TOTAL 45°-55° N (RUSSIAN + STRATOSPHERE) ™, 10 ee RUSSIAN BOMBS 0 | 1947 STRATOSPHERIC | 1948 | 1949 1950 4954 4952 1953 1954 1955 +956 Fig. 8— Predicted Sr®™ fallout curves; total fallout 45°N—55°N. 263 L {957 #958