Warning Procedures As in the past series, away from the Test Site and A Civil Aeronautics officer tion-to provide for closure every effort is being made to warn people the Las Vegas Bombing and Gunnery Range. again is assigned to the Test Organizaof air space if necessary to prevent ex- posure of persons in aircraft. \ . Persons in the Test Site area also are advised of precautions to take against the brilliant flash of light and the shock wave from the detonation. No member of the public has suffered eye damage in past series from the light flash. Minor damage from the shock wave occurred in some nearby communities, principally in the earlier series. Radiation Exposure Levels Many thousands of measurements of fallout radioactivity have been made in the Test Site area since the beginning of testing in Nevada in 1951. These measurements have confirmed that Nevada test fallout has not caused illness or detectable injury to health. The highest fallout level noted to date in an inhabited place outside of the Test Site occurred in.1953 at a motor court near Bunkerville, Nevada, where about 15 people might have accumulated 7 to 8 roentgens if they had continued to live there indefinitely. The highest estimated total exposure to.a community has been 4.3 roentgens at Bunkerville. Most of the communities in the Test Site area have received less than one roentgen total estimated exposure as a result of the six years of testing in Nevada, The National Academy of Sciences - National Research Council in a 1956 report recommended "...-that individual persons not receive more than a total accumulated dose to the reproductive cells of 50 roentgens up to age 30 years (by which age, on the average, over half of the children will have been born), and not more than 50 roentgens additional up to the age 40 (by which time about 9/10 of their chil- dren will have been born....) ...."and....that for the present it be accepted as a uniform national standard that X-ray installations (medical and non-medical), power installations, disposal of radio- active wastes, experimental installations, testing of weapons, and all other humanly controllable sources of radiations, be so restricted that members of our general population shall not receive from such sources an average of more than 10 roentgens, in addition to background, of ionizing radiation as a total accumulated dose to the reproductive cells from conception to age 30...." Natural background radiation is roughly 4 roentgens per 30 years. Thus the value for man-made sources (stated by the National Committee - 48 - a O