CDE.
Escort destroyer.
DE.
Oestroyer escort.
debris (radioactive).
See weapon debris.
decay (radioactive). The decrease in activity of any radioactive material with the passage [bf time due to
the spontaneous emission from the atomic nuclei of either alpha or beta particles, somakimes accompanied by gamma radiation, or Dy gamma photons atone. Every decay process has a definite half-jife.
decontamination. The reduction or removal of contaminating radioactive material from a strumture, area,
object, or person.
Decontamination may be accomplished by (1) treating the surface to Ffemove or
decrease the contamination; (2) letting the material stand so that the radioactivity isfldecreased as
a result of natural decay; and (3) covering the contamination in order to attenuate thefradiation
emitted.
device. Nuclear fission and fusion materials, together with their arming, fuzing, firing, clemicalexplosive, and effects-measuring components, that have not reached the development statis of an
operational weapon,
OM.
Minelayer destroyer.
200.
Converted destroyers designed to conduct high-speed minelaying op@rations.
Department of Defense.
States.
The Federal executive agency responsible for the defense of th@ United
Includes the four services and special joint defense agencies.
through the Secretary of Defense.
dose.
Reports to thefPresident
A general term denoting the quantity of ionizing radiation absorbed.
The unit of abs
the rad (which see).
In soft body tissue the absorbed dose in rads is essentially equa
bed dase is
effectiveness of the absorbed radiation. Dosage is used in older literature as wel] as
and simply exposure, and care should be exercised in their use. See also exposure.
xposure dose
Sure in roentgens.
The biological dose (also called the RBE dose) fn rems is a measure
to the expo-
f biological
dose rate,
As a general rule, the amount of jonizing (or nuclear) radiation that an individ
dosimeter.
An instrument for measuring and registering the total accumulated dose of {or expBsure ta) ion-
dosimetry.
The measurement and recording of radiation doses and dose rates.
would receive per unit of time,
It is usually expressed as rads (or rems) per hour or
divisions of these units such as millirads per hour.
The dose rate is commonly used to
level of radioactivity in a contaminated area. See survey meter.
iZing radiation.
of
Instruments worn or carried by individuals are called personnel] dosime
OTMB.
See also do imeter, sur-
Oisintegrations per minute, a measure of radioactivity, literally atoms disintegrating
Difficult to directly compare with roentgens per hour for mixtures of radionuclides.
Air pressure that results from the mass air flow (or wind) behind the shoc#
Edgerton, Germeshausen & Grier, Boston, Massachusetts (now EG&G, Inc.}).
vided timing and firing electronics and technical film coverage.
waves of relatively long wavelength.
elliptical approximations.
Method of predicting fallout areas.
ETA.
Estimated time of arrival.
ETD.
Estimated time of departure.
475
Pro-
t wave
and radio
Data received that have the
are plotted from a vertical slice of the atmosphere. The equal or near-equal conditions
found to form a closed path that appears roughly elliptical in shape. The elliptical ap
is the ellipse drawn through these data points having nearly the same values.
The ellips
so that the set of data comes closest to the curve.
Explosive Ordnance Disposa? Unit (Navy).
front of a
An AEC contragtor.
electromagnetic radiation. Electromagnetic radiations range from X-rays and gamma rays of sh
Tength (high frequency), through the ultraviolet, visible, and infrared regions, to rada
E00U.
Jer minute.
David Taylor Model Basin, Carderock, Maryland (Navy).
dynamic pressure.
blast wave.
EG&G.
[t is concerned with the use
vartous types of radiation instruments with which measurements are made.
yey meter.
OPM.
T or material
itiples or
ndicate the
is drawn