~14this period, and (2) at no place is the dose so high that it cannot be protected against. A frame house affords a protection factor of about two, a basement about ten. Dr. Scoville presented a table of estimated areas for various doses in different types of terrain. The extreme entries were as follows for the integrated dose from a 15 MT shot at H } 2 days, in rural in epen areas in average in city shelter in city 2100 eq.. mi. 205 r 8800 sq. mi, 7500 sq. mi. 630 r 1,600 3500 320 The next effects item was atomic weapons for air defense. For & 2 KT burst at 40,000 ft the 2000 and 5000 rem radii are greater than the maximum lethal gust radius. The 2000 rem radius is about ee i506 yas—The relative contribution of nuclear radiation effects changes markedly with altitude. The preliminary estimates of effects on ballistic missiles are discouragingly small, For the next topic, Capt. John H. Lofland, USN, who was present WIGWAM Test during part of Dr. Scoville's talk, discussed the WIGWAM test, planned for the middle of May, 1955, This wi be an underwater effects test ae at deep submergence. A 31 KT depth in 12,000 ft of water. will be detonated at 2000 ft The test will take place about 315 miles west and southwest of San Diego. Three submarines will be at 250 ft depth in order to obtain information on maximum lethal range against submerged targets (expected to be 6500-1e,000 ft). These vessels will 4 /o ay