cade: radex are. ‘ orefix used to indicate that the parameter in question is determined on the basis ne dose rate records as distinguished from one determined photographically. diological exclusion area. An area to which access is limited or prohibited due to the presence of generally distributed radioactive material constituting a personnel contamination hazard. radiation pulse: A square wave pulse recorded on magnetic tape by the recycling of a GITR ion- ization chamber. For the high-range channel of the std-GITR, each radiation pulse represents a dose increment of 0.243 r. A low-range radiation pulse is one-thousandth of the high range. residual dose rate: The radiation field due to deposited radioactive material, which remains sec-GITR: Shadowbias: Shine: SIO: after passage of the radiating cloud. Secondary gamma-intensity-time recorder, a term uSed to designate an underwater GITR that failed to drop. Records produced by the underwater GITR under these circumstances were similar to those produced by the standard GITR. alteration of fallout collections caused by particle trajectories in the neighbor- hood of surfaces vertical to the prevailing wind. A term used in this report to distinguish radiation emanating beyond the visible boundaries of a diffuse body of radioactive aerosol from the field within said diffuse body. Scripps Institution of Oceanography, La Jolla, California. Smooth boundary: An imaginary base surge boundary defined by the circle best approximating any of the several photo-boundaries. (See photo-boundary.) source center: A point within a diffuse body of radioactive aerosol at which the dose rate reaches peak intensity probably as a result of optimum geometry. source intensity: The energy emitted at a radioactive source, used here as the number of Mev emitted per unit time per unit volume or area. spike: A sharp rise and fall in gamma dose rate as seen on a plot of gammaintensity versus time, with the connotation that the peak dose rate is very much higher than the dose rate either before or after the peak. SRC: Sample recovery center, an area specially arranged to maintain records and contamination control during sample recovery operations. standard decay curve: A decay curve for mixed fission products at early times selected from the latest literature available at the time of writing (References 36 and 89) and used consistently throughout this report (see Section B.2). standoff distance: The distance a ship delivering a weapon must maintain in order to avoid tactical damage, usually used in the report with the connotation that the weapon is nuclear. std-GITR: Standard gamma-intensity-time recorder, a GITR with a 12-hour tape transport mounted tn the center of a coracle deck (see Section 2.2.1). subsurface buoy: A 3-foot diameter buoy placed at a depth of 150 feet below the surface when surface zero: surge: establishing a deep anchor (see Section 2.3.1). The point at the water surface directly over the point of detonation of an underwater shot. An abbreviation for base surge in general or a specific segment of the base surge. When modified by the adjectives upwind or downwind, the term is used in the more restrictive sense of the upwind or downwindportions of a torus assumed Surface zero. A remnant of radioactive aerosol trailing behind the base surge proper. The meaning is extended to include radioactive aerosol temporarily detained in turbulent eddies associated with ship superstructures and streaming downwind from the ship after passage of the base surge (see Section 3.3.2). 42 422 hy SZ: tall: to represent a generalized base surge (Figure 3.63). A mark painted in a known location on a ship’s deck indicating that a survey meter reading is to be taken at that point (see Section 3.4.2). cS survey point: