UNRESOLVED QUESTIONS ON FALLOUT OF INTEREST TO OCD The portion of activity deposited in local fallout. Effects on (1) of small changes in burst height. Effects of soil type and building material on (1) above. The radioiodine problem (inhalation). Detection of fallout directly by the physical senses. Feasibility of developing fallout prediction techniques for operational applications. Radioactivity of craters of multi-megaton explosions. Interaction of simultaneous surface bursts. APPENDIXA