ee @ ae emt wt etalon AE Meee nee. et ‘ “ ns | Hazards Resulting from™;tomic Bomb bxvlosion CJTF SEVEN No. 3-53 b, Extending downwind, (and to some extent crosswind and upwind) an airborne radioactive hazard will exist. Its characteristics will depend on the meterological influences such as wind speed and direction at var ious altitudes up to the maximum height reached by the cloud. c. Contaminated water in the lagoon adjecent to the shot site may be of conSequence, and will be analyzed by the radiological safety unit of: TG 7,1 immediately after shot time and at other -ntervals. d. Unless care is exercised, individuals or objects entering contaminatec areas may transfer radioactivity to clean areas. e. By meens of instruments, such as Geiger-.ueller counters and ion chambers, it is possible to detect the area of contarmnation and to mea~ sure the intensity of the radioactivity, Hadiation intensity will nor-+ mally be measured and reported in roentgens per hour. Besides those instruments, dosimeters and film badges will be used as indicators of the accumulated exposure to radioactivity, Only personnel involved in work near, or in, radioactive areas will wear film badges to provide a except that film badges will be issued to permanent record of exposure/10% of the ship's crew to aid in estimating crew dosage in the event of heavy fall-out. decrease f, The intensity of the radioactive hazard tends to Xempesstwith time due to decay of radioactive materials, and dispersion and dilution, depending upon climatic conditions. ..s an approximation, the insurface contamination tensity of the/xadiatinn from the fission products decreases by radio. active decay inversely with the time after the detonation, As a further approximation, the intensity of water contamination decreases by radio-— active decay and diffusion inversely with the square of the time efter whe detonation, °