DUKW: A small amphibious surface craft capable of being used either in the water or on land. early decay curve: Any of a family of decay curves presumed to be characteristic of radioactive material deposited from the base surge during the first 5 minutes of its existence. early gamma dose: An expression arbitrarily defined in this report as the gammaradiation dose received within the first minute after zero time. (See initial dose.) A Liberty ship used on this operation as a ficating platform for instruments. EC=2: Edgerton, Germeshausen, and Grier, Inc., a contractor providing timing and EG&G: envelopment: firing service to the Task Force. Eniwetok Marine Biology Laboratory, a laboratory on Parry Island. A term used in a special sense to describe movement of the complex base surge EPG: or total as illustrated in Figure 3.63. Eniwetok Proving Ground, the area surrounding Eniwetok and Bikini atolls in the EMBL: over a position upwind of surface zero. fallout: FFP: film pack: float: Flowrator: flyaway: Envelopment may be Skirting, partial, Marshall Islands. Particulate material raining down from or falling out of clouds or other aerosols produced by atomic devices, usually used with the connotation that the material is radioactive or carries with it radioactive debris from the device. Floating film pack, any of several types of simple floats designed to support film packs at the water surface; the term includes both float and film pack (see below). An assemblage of special photographic films so packaged as to give a reliable measurementof total gamma dose (see Section 2.2.5). Any surface buoy; however, the term is frequently used to designate a small circular float which contains a film pack (see Section 2.2.5). A commercially produced instrument that measures the rate of fluid flow through a closed system. Any of several specially scheduled flights usually direct to the continental U.S. for the principal purpose of returning short-lived radioactive samples to home laboratories for analysis. The various flyaways are usually designated by their departure time relative to a specific shot, e.g., Wahoo plus 10-hour flyaway or 10-hour flyaway. An abbreviation for film pack. FP: fractionation: Alteration of the normal spectrum of fission products resulting from a nuclear detonation by mechanical or chemical separation. Fractionation is usually expressed in terms of R-values. (See R-value.) free-field: An arbitrary term defined to mean the radiation field near the water surface re- FS: Getok Hill: GIDU: sulting from a cloud of airborne radioactive material unmodified by any projections above the water surface (see Section 1.1). Funnel sample, a fallout sample collected by means of a funnel and bottle (see Section 3.5.1). GITOUT: A Spiritual sanctuary for harassed membersof the project. Gamma-intensity-decay unit, an instrument that flushed radioactive fallout collected until H+4 minutes into a lead shield where a continuous decay record was started immediately. An electronic device that automatically reads out the gamma-intensity-time GITR: Gamma-intensity-time recorder, an instrument that measures gamma intensity Gustave I: H and N: ured by a detecting instrument. An ASEL-GITR. Holmes and Narver Inc., the site contractor providing construction and housing services. recorder tapes and plots the data (see Section 2.2.8). as a function of time and records this information on magnetic tape (see Section 2.2.1). gross gamma field: Arbitrarily defined as the total, uncorrected gammafield exactly as meas- Hy 420