dirty weapon
A weapon so designed that upon detonation
the amount of contaminating material, in the
form of either fission fragments or irradiated
material (or both), is relatively high by
comparison with other possible design
variations of the same mark numbered weapon,
A weapon may also be "dirty" by comparison
with different mark numbered weapons of the
same general yield,
dose (dosage)
Ionizing radiation delivered to a specific
area or volume or to the whole body, Units
for dose specification are roentgens for X
or gamma rays, roentgens equivalent man
(rems) for alpha, beta and neutron bombard-
ment of human tissue,
In radiology the dose
may be specified in air, on skin or at some
depth beneath the surface; no statement of
dose is complete without specification of
location, In current thinking there is a
tendency to regard a dose of radiation as the
amount of energy absorbed by tissue at the
site of interest per unit mass,
drag
That component of the total air forces on
a body, in excess of the forces owing to
ambient atmosphere and parallel to the
relative gas stream but opposing the
direction of motion; quantity which imposes
limitations upon top speed of vehicles,
missiles, and so forth.
drone aircraft
Radio-controlled aircraft not requiring the
presence of crewmen aboard during flight.
drop sequence
The prescribed order of the events which take
efficiency
place in the arming, fuzing, and firing
systems of an atomic weapon from time of
release to detonation.
The efficiency of an atomic weapon or device
may be defined as the ratio of the energy
actually developed when the bomb or device
explodes (the energy yield) to the total
energy available, In other words, efficiency
is the fraction of energy available which is
actually released in an explosion,. In the
case of a fission weapon this is equal to
the ratio of the number of meclei which
actually undergo fission to the total number
of fissionable nuclei present,
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