18 Table 4, Volatile/refractory ratio (volatile to refractory phase relative amounts) as a function of particle size in fallout from Nevada Test Site tower shots. Particle Tower shot size (um) Diablo 500-1000 -- 350-500 “- Shasta Smoky -- 1.5 + 0.5 1.6 + 0.6 1.5 + 0.3 297 -350 1.2 + 0.1 1.6 + 0.9 1.4 + 0.5 250-297 1.3 + 0.1 1.4 + 0.5 1.8 + 0.4 210-250 1.5 + 0.4 1.6 + 0.4 1.4 + 0.3 177-210 1.3 + 0.1 1.5 + 0.4 1.6 + 0.5 149-177 0.4 + 0.4 1.5 + 0.4 1.9 + 1.0 125-149 1.2 + 0.2 1.9 + 0.6 2.1 + 1.2 105-125 1.4 + 0.7 1.8+0.5 88-105 1.2 + 0.2 2.1 + 0.6 44-88 1.4 + 0.3 1.7 + 0.3 <44 17401 | | 2.2 + 0.4 ~ 1.5 + 0.4 2.4 + 0.9 > 2.3 + 0.8 2.5 + 0.4 The pertinent physical properties of fallout (G177, p. 411) from a tower shot are summarized as follows: ® Size--largest dimension between a few micrometers and a few hundred micrometers.