946 INDEX effect on 137Cs content of Norwegian milk, 875 strontium-90 content, effect of evaporation, 594-95 tritium content in 1963, 673 Sodium-22 concentration in air at Richland, Washington, 206-7 concentration in rainwater, 219 content in animals, 219-20 content in foods, 219-20 content in humans, 219-20 distribution with altitude in 1962 and 1964, 211 distribution with latitude in stratosphere, 212 measurement accuracy with pulse analyzer, 246 measurementin air filter samples by gamma ray spectrometry, 198-99 precipitation effects on deposition, 214-15 stratospheric concentration, 327 Sodium~23 concentration in rainwater, 219 Sodium-24 search for, in Sedan shot debris, 90 Sodium carbonate fusion with debris particles for analysis, 87 Sodium chloride coalescence, 286-89 wetting kinetics studies, 286-87 Sodium fluorescein particles of, charging studies, 263 Sodium hydroxide formation in molten soil systems, 37 Sodium hydroxide systems (NaOQH*RbOH) formation in fireball, 38 Sodium ions diffusion in fused silicates, 13-14 Soil Conservation Service **Stront:um-90 on the Earth’s Surface. W”’, 359-68 Soils cesium transfer to plants from, 899-900 cesium-137 content in Chicago, 784-86 cesium-137 content, variations in, 711-17, 722 effect on cloud geometries from underground bursts, 335-39 fractionation correlations for bursts in various types, 72-81 fractionation of induced radioisotopes of, 34 gammaradiation levels, 238-40 molten, chemical studies, 35 sampling, AEC and USDA program, 378 strontium-90 content, 360-63 strontium-90 content, variations in, 711-16, 721 South Africa (see Union of South Africa) South America tritium concentrations since 1961, 655- 56, 667-68 South Carolina environmental gamma ray levels, 240 South Dakota environmental gamma ray levels, 240 Southern hemisphere circulation changes with height in atmosphere, 694-95 comparison with northern, in 9Sr content of air, 616, 623-24, 625-26 debris deposition correlations with southern hemisphere, 695-96 meteorological differences from northern hemisphere, 687 seasonal variations in 1960, 688 spring deposition peaks, 791, 792, 797 stratospheric radioactivity from weapon tests, 409-20 tritium concentrations since 1961, 657 Spectrometers particle charge studies, 265, 268 Spectrometry (gamma ray) cesium-137 in forage and feeds, 704 cesium-137 in milk, 704 cesium-137 in rain samples, 704 environmental gammaray studies, 233-44 fission product radioisotopes, 183-97 multidimensional instrument, 199-204, 248 particle analysis program at LRL, 155 particles from high yield air bursts, 108-18 radioisotope measurements in fallout samples, 198-221 radioisotope samples, 428, 432-33 surface air samples, 497, 498 Spectroscopy(beta ray) rainfall samples, 531 Spitzbergen tritium concentrations since 1961, 651, 657 Spring deposition peaks in, 498-505, 584, 791, 792, 797 milk contamination levels during, in Norway, 865 storm activity, effects on beta deposition, 532-65 Springfield Project, 436-49, 584 Squier, LaVon A. **Kinetics of Wetting in Washout of Dust’’, 281-300 Stanford Research Institute **Small Boy Shot Fallout Research Program’’, 44-71 Staplex air sampler, 84-5 Star Dust Project, 602, 609-13 Starfish Prime burst cadmium isotope production, 693-94 cadmium-109 tracer studies, 405-8 debris, stratospheric half-residence 325 stratospheric debris in southern hemisphere, 409-20

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