Aun local regions scattered across the continent as far as Troy, New York. This comes about as a result of weather conditions at the time of a particular exysilosion, which say quickly carry fallout ut high altitudes for many miles, and then precipitate it to the ground where an intense thunderstorm occurs. fallout deposition which Local -ou:d have resulted in thyroid ex- posures to children in the range of 5 to 40 rads have, for example, occurred in “roy, New York on April 26, 1953 and in Roewell, New Mexico on April 25, 1953. Salt Lake City values were 3 to 1& rads for fallout on May 7, 1962, and 2 to l2 rads for fallout on March 24, 6) 1953. This hacard has arisen not only from nuclear tests in the atmosphere and at the earth's surface, but also as a re~ ad sult of certain underground nuclear tests. Venting (produce tion of radivactive clouds capable of producing fallout) has deen reported for at least seven underground nuclear testes: Shot ESS of OCperation Teapot, September 15, 1961; Project Gnome shot, Decemtor 10, 1961; the Des Moines shot, June 13, 1962; Project Sedan, July €, 1962; and shots on March 5, 1962, April 14, 192, end May 19, 1%2. although data for these shots are relative’y limited, we calculate that, for example, fallout from the underground Gnome 3hot delivered sufficient fallout to tre vicinity of Carisbad, New Mexico to cause thy- roid levels of fro. 7 to 55 cade in children, under the circumstances outiinci above.