G A M M A R AY S -- A f o r m o f e l e c t r o m a g n e t i c
FLIGHT DECK--In aircraft carriers the uppermost
complete deck. It is the deck from which aircraft
take off and land.
GAS FREEING--Operations performed in testing,
FORCE--A push or pull that tends to produce motion
or a change in motion. Force is what makes
materials or conditions within or related to a
something start to move, speed up, slow down, or
confined space which may present hazards to
personnel entering or working in or adjacent to the
force may act on an object without being in direct
contact with it. The most common example of this is
GASKET MATERIALS--Includes sheet and strip
the pull of gravity. Forces are usually expressed in
rubber, leather, canvas, rags, oakum, and paint.
terms of weight units, such as pounds, tons, or
GEOPOLITICAL SITUATION--ITT leaders read
geopolitical situation for the drill and refer team
FORECASTLE (pronounced folk'sul) DECK--This
members to order of battle, include current
deck is above the main deck at the bow. The part of
readiness condition of ship, OOC, or degraded.
the main deck from the stem to just aft of the anchor
windlass is the forecastle.
GROUND ZERO--The point of detonation of a
FORWARD WELL DECK--Forward part of the
nuclear surface burst on land.
main deck between the upper deck and forecastle.
GUNWALES (pronouced gunnels)--The upper edges
FREE ELECTRON--An electron that is not part of an
of the sides where the sheer strakes join the main
atom, molecule, or ion; one that has been released
from an atom or molecule during the process of
HALF DECK--Any partial deck between complete
FREE SURFACE EFFECT--Free surface in a ship
HALF LIFE--The amount of time it takes for the level
causes a reduction in GM because of a change in the
center of gravity and a consequent reduction in
particular radioactive material to decrease by one
stability. The free surface effect is separate from and
independent of any effect that may result merely
from the addition of the weight of the liquid.
HALF THICKNESS--The thickness of shielding
material necessary to reduce the intensity of gamma
FREEBOARD--The distance from the waterline to
radiation that passes through it by half.
the main deck.
HANGAR DECK--The deck on which aircraft are
FUEL--A solid, liquid, or even a vapor. Some of the
stowed and serviced when not on the flight deck.
fuels you will come into contact with are rags,
paper, wood, oil, paint, solvents, and magnesium
HAZARDOUS MATERIAL (HM)--Any material
that, because of its quantity, concentration, or
physical, chemical, or infectious characteristics,
metals from the gaseous state.
may pose a substantial hazard to human health or
the environment when released.
FUNGI--Includes such plants as yeasts, molds, and
mildews. These organisms are known for their
HAZARDOUS WASTE (HW)--Any discarded
ability to spoil foods and fabrics.
material (liquid, solid, or gas) that meets the
definition of HM.
FUSION--A nuclear reaction in which the nuclei of
atoms of a light element are combined to form the
H E A R I N G C O N S E RVAT I O N P RO G R A M --
nucleus of an atom of a heavier element, releasing a
Hearing loss has been and continues to be a source
tremendous amount of energy.
of concern within the Navy. Monitoring of the
Hearing Conservation Program is the responsibility
G SERIES NERVE AGENTS--Tabun (GA), Sarin
of the safety officer.
(GB), Soman (GD).
H E AT -- I nv o l v e s t h r e e m e t h o d s - c o n d u c t i o n ,
GALLERY DECK--First deck or platform below the