years since the regular nuclear tests were started. are 58,000 man-roentgens for 100,000 people. The round numbers If the area considered around the Nevada Test Site is enlarged to include 1,000 ,000 people . the average exposure is about 0.1 roentgens for the six years, or at a rate of about 1/2 a roentgen per thirty years. Thisis 1/20 of the recommendation of the National Committee on Radiation Protection and Measurement for maximum exposures. , The highest measured concentration of fission product activity in the air off the Nevada Test Site was at St. George, Utah during the Spring 1953 test series, amounting to about 1.3 microcuries per cubic meter of air averaged over a 24-hour period. It was esti- mated that the radiation dose to the lungs from this activity was less than that delivered every month by naturally occurring radioactive iso~ topes in the air that we breathe. The highest measured concentration of activity from fallout material in water off the controlled area was at Upper Pahranagat Lake, Nevada in the Spring of 1955 amounting to 1.4 x 1074 microcuries per milliliter at 3 days after the detonation. This is 1/36 of the opera- tional guide--an amount that is considered safe for continuous consumption. (= 33 - | . !