DEPOSIT RADIATION--Radiation from radioactive
DARKEN SHIP BILL--The Darken Ship Bill is used
to ensure that all DOG-ZEBRA fittings are closed
particles that have landed on the ship.
by applicable divisions whenever darken ship is
DETECTOR--Any mechanism by which the
approach or presence of a chemical or biological
agent is made known.
DCTT TEAM LEADER--The executive officer
serves as the chairman of the planning board for
DETECTOR PAPER--A specially treated paper used
training and team leader of the DCTT. The
to determine the presence of liquid chemical agent.
executive officer will coordinate the planning and
DETECTOR TUBE--A glass tube that uses a
execution of the ship's training effort. The team
sensitive chemical (in a suspension of silica gel)
leader of the DCTT is responsible for the
w h i c h p r o d u c e s c o l o r c h a n g e w h e n eve r
management of the training team.
contaminated air is pulled through it.
DCTT TEAM COORDINATOR--The ship's senior
DETERGENT--A synthetic cleaning and
Damage Controlman or Hull Maintenance
emulsifying substance usable in either fresh water
Technician normally hold the position of DCTT
or seawater for decontamination.
DIFFUSION--A process to disperse and equalize a
physical state (such as temperature) or a gas (when
one gas is introduced to another).
fragments decompose to a more stable state.
DILUTION VENTILATION--Introduces air into a
DECKS--The floors of a ship.
space to dilute the contaminated air within the space
DECONTAMINANT--Anything used to break down,
to an acceptable level. Generally used for the
neutralize, or remove a chemical or biological
c o n t r o l o f f l a m m a b l e , o x y g e n - d e fi c i e n t o r
material posing a threat to personnel or equipment.
oxygen-enriched areas, rather than control of
DECONTAMINATION--The process of removing
DIRECT FIRE ATTACK--A method of attacking a
equipment, or structure. The process of making any
fire in which fire fighters advance into the
person, equipment, or structure safe by absorbing,
immediate fire area. The extinguishing agent is
destroying, neutralizing, making harmless, or
applied directly onto the seat of the fire to
removing chemical or biological agents.
extinguish the fire or spray a water fog (fog attack)
into the hot gas layer over the seat of the fire to gain
degree to which decontamination reduces a
radiation hazard. The ratio of the radiation intensity
DISPLACEMENT--The weight of the volume of
after decontamination to what it would have been
water displaced by the hull.
DOG ZEBRA--Fittings marked with a red Z inside a
DEEP SHELTER--Compartments that provide
black D. These modified fittings are secured during
shielding against radiation.
condition ZEBRA and darken ship conditions. You
DEFICIENCY OF OXYGEN--An atmosphere
must have proper authorization to open fittings with
where the oxygen content has been reduced below
this classification when the ship is at either
the point at which a person may work comfortably
condition ZEBRA or darken ship.
(approximately 19.5% by volume).
DELAYED FALLOUT--Fallout from a nuclear
explosion that does not fall to the surface until 24 or
person is exposed in a given period of time.
more hours after the explosion.
DOSE (RADIOLOGICAL)--The total amount of
ionizing nuclear radiation that is absorbed by an
DELTA (D) FIRES--Those that occur in combustible
metals, such as magnesium, titanium, and sodium.
individual, an object, or a system over a specified
DENSITY--The density of any material, solid or
liquid, is obtained by weighing a unit volume of the
which a radiological dose is absorbed.