surge is probably radioactive or carries radioactive material with it. For de- tailed discussion of gamma records, base surge may be subdivided into primary and secondary base surge (see Figure 3.63). Primary base surge is the surge generated by collapse of the first column formed and is outermost. Secondary base surge (whose existence is postulated on the basis of photographic records of secondary plumes and other corroborative evidence) advances radially behind the primary base surge. . base surge decay curve: Same as early decay curve. boundary plot: A plot of various photographically determined base surge boundaries versus time, used for correlating specific features of the gamma dose rate records BWA: cic: with these photographic boundaries. Beach work area, an area on Parrv Island specially equipped for the staging and instrumenting of coracles. Combat information center, a highly centralized information and control center . aboard combatant ships. CL: Crosswind left, an abbreviation used to designate an approximate radial line 90° to the left when looking down the downwind leg of the target array (~ 158° T). cloud: An aerosol or body of airborne liquid droplets, usually used with the connotation that the droplets are radioactive or are associated with airborne radioactive material. The meaning of cloud is sometimes extended to include the entire aerial environment, such as material that is in the process of falling to the sur- cloud slope: column: face. A term used in discussion of stationary cloud models In order to avoid expressions implying movement, such as time of arrival. Cloud slope is the rate at which the concentration of radioactive material in a hypothetical model increases with time (see Section 1.3.1). The mass of solid water, liquid aerosol, and gaseous material that is blown into the air by an underwater nuclear detonation. The energy of this mass falling back to the surface generates the base surge. A circular floating platform specially designed to mount project instruments (see Section 1.3). Crosswind right, an abbreviation used to designate an approximate radial line CR: 90° to the right when looking down the downwind leg of the target array (~338° T). cross-contaminate: An uncontrolled interchange of material between two individual samples coracle: D: occurring at time of collection or during subsequent handling. Downwind, an abbreviation used to designate the approximate radial line extend- decrement: A presumed decrease in the concentration of airborne radioactive material within DL: Downwindleft, an abbreviation used to designate the approximate radial line 15° to the left when looking down the downwind leg of the target array (~ 233° T). Downwind left left, an abbreviation used to designate the approximate radial line 30° to the left when looking down the downwind leg of the target array (~ 218° T). dimethyiterephthalate, a crystalline material used to form the chemical filter in air filtration instrument (see AFI). Downwind right, an abbreviation used to designate the approxinate radial line 15° to the right when looking down the downwind leg of the target array (~ 263° T). ing down the downwind leg of the target array (~ 248° T). the visible base surge, resulting in a decrease in the observed dose rate. Such a decrease may be located centrally (central decrement) or between the primary and secondary base surges (intersurge decrement). (See Figure 3.63.) deposit dose or doserate: The gamma dose or dose rate resulting from radioactive material deposited on surfaces. DR: DRR: Downwind right right, an abbreviation used to designate the approximate radial line 30° to the right when looking down the downwind leg of the target array (~ 278° T). 419 \ DMT: ™MI DLL: