T-boat: throwout: An LCU. (See LCU.) MaSsive ejections from a detonation, which follow a ballistic trajectory. These ejections from an underwater detonation are principally water and, thus, follow ~ the usual modified ballistic trajectory. time of arrival: Arbitrarily defined as the lapse in time from detonation to some specified point on the increasing slope of the first major dose rate peak at a specific location; abbreviated TOA. Other definitions are also possible (see Section 3.3.4). time of cessation: Arbitrarily defined as the lapse in time from detonation to the point at which the dose rate curve of the major event drops to background or nearly so; abbrevlated TOC. TOC is determined in this report by inspection of the normalized rate curve (see Section 3.3.4), time of peak: The lapse in time from detonation to the first major dose rate peak; abbreviated TOA: Toc: TOP. Time of arrival. Time of cessation. transit: A term used in a special sense to describe passage of the complex base surge TOP: transit plot: tripod: U: Time of peak. over a fixed position. Transit may be through the center, central, inner edge, edge, outer edge, or distance as illustrated in Figure 3.63. A plan view of the probable photo-boundaries and smooth boundaries at the times of their individual initial and final transits at a given station. These plots are useful for intercomparison of the dose rate records from several stations. A three-legged mast installed on coracies to aid tn handling at sea (Figure 1.2). Upwind, an abbreviation used to designate the approximate radial line extending along the upwind leg of the target array (~ 68° T). upwelling water: Subsurface water moving upward to the surface as a result of bomb energy, usually with the connotation that this water is radioactive. UW-GITR: Underwater gamma-intensity-time recorder, a detector modified to detect gamma valley: fields underwater. A marked decrease in dose rate occurring between two dose rate peaks. visual approach velocity: Any of several approach velocities for the photographically determined base surge boundaries. water decay curve: Same as late decay curve. water dose rate: Gamma radiation due to fallout remaining suspended in the surface water layer. white water: Water containing visible amounts of bottom material pulverized and suspended WT: by the detonation, with the usual connotation that this water is very radioactive. Weapons Test Report, of which this report is an example. The alphabetic time zone designator for Greenwich Mean Time (GMT). 423 Pages 424 through 424 deleted. My Zz: