~6- C. e, Puysical, chemical, and radiochemical properties f. Deposition of toxic materials Intermediate and delayed fallout 1. The production and distribution of fallout in the atmosphere a. b. c. 2. Dependence on height of burst, yield, type of explosion, and scavenging material Obdserved or inferred physical, chemical and radio- chemical properties, with special reference to fractionation Division of material: (local), tropospheric, and stratospheric; determining conditions Transport through and removal from the atmosphere a, The stratosphere (1) (2) Transport, mixing, possible methods of removal Storage time; cumulative world-wide fallout as a function of time; predictions of future fallout from single event; from past weapons tests (3) b. Sources of information; measurements and estimates of radioactivity in stratosphere ‘The troposphere (1) Tropospheric removal processes; storage time (a) (2) (3) Precipitation, intercepticn, dry deposition JCAE Possible regions of unusual removal (fallout) because of meteorology or topography {a) Exposure to prevailing winds and (bo) Effect of large bodies of water on the sometimes accompanying effect, orographic rainfall the distribution of fallout on adjoining land areas Meteorological tracking and other discussion of transport \L2

Select target paragraph3