survey, radiation. rennneansenn Evaluation of the radiation hazards associated with radioactive materials. “sweet-sour", Aerial survey radsafe reports nade during the test series; connotes uncontaminated ‘sweet! or contaminated (sour) aeralogical conditions. oH SWU-NAS, S$.D. -AP. Sp2c1al Weapons Unit, Naval Air Station, San Diego, California. Personnel transport (Military Sea Transportion Service). TAU. Test Aircraft Unit. TOY. Temporary duty assignment. TE. Task Element. thermal radiation. Electromagnetic radiation emitted in two pulses from a surface or airburst from the fireball as a consequence of its very high temperature; it consists essentially of ultraviolet, visible, and infrared radiation. In the first pulse, when the temperature of the fireball is extremely high, ultraviolet radiation predominates; in the second pulse, the temperatures are lower and most of the thermal radiation lies in the visible and infrared regions of the spectrum. thermonuclear fusion. Refers to the processes in which very high temperatures are used to bring about the usion of Tight nuclei, such as those of the hydrogen isotopes (deuterium and tritium), with the accompanying liberation of energy. The high temperatures required to initiate the fusion reaction are obtained by means of a fission explosion. See also fusion. TNT equivalent. A measure of the energy released as the result of the detonation of a nuclear device or weapon, expressed in terms of the mass of TNT that would release the same amount of energy when ex- ploded. The TNT equivalent is usually stated in kilotons (1,000 tons) or megatons (1 million tons). The basis af the TNT equivalence is that the explosion of 1 ton of TNT is assumed to release 1 billion calories of energy. See also megaton, yield. tropopause. The boundary dividing the stratosphere from the lower part of the atmosphere, the troposphere. The tropopause normally occurs at an altitude of about 25,000 to 45,000 feet (7.6 to 13.7 km) in po'ar and temperate zones, and at 55,000 feet (16.8 km) in the tropics. See alsa stratosphere; troposphere. The region of the atmosphere, immediately abave the Earth's surface and up to the tropopause, troposphere. in which the temperature falls fairly regularly with increasing altitude, clouds form, convection 15 active, and mixing is continuous and more or less complete. Trust Territories. The Marshal? Islands were Trust Territories under’ the jurisdiction of the United Nations. Assigned by the United Nations to the United States in trust for administration, development, and training. TY. TSU. Task Unit. Test Services Unit. TSUP. Test Support Unit Provisional. TSuU. Test Support Unit. TWX. Pronounced "twix"; teletypwriter exchange. type commander. The officer or agency having cognizance over all Navy ships of a given type. addition ta the particular ship's assignment in a task force or fleet. UCLA. University of California, Los Angeles. UCRL. University of California Radiation Laboratory, Livermore, California. UF-1. The Navy designation for the SA-16A. UHF. UK. This 1s in Used in CASTLE for weather, island resupply, and VIP aircraft. Ultra-high frequency. United Kingdom. ultraviolet. Electromagnetic radiation of wavelengths between the shortest visible violet (about 3,850 angstroms) and soft X-rays (about 100 angstroms). 484