milliroentgen.
MINSY.
rm ee ee
MPE,
MPL.
Mare Island Naval Ship Yard, California.
Maximum Permissible Exposure {rule dose). That exposure to ionizing radiation that fs established by
authorities as the maximum over certain periods without resulting in undue risk to hurfan health.
Maximum Permissible Limit.
That amount of radioactive material in air, water, foodstiffs, etc. that
is established by authorities as the maximum that would not create undue risk to humarg
mR;mr.
MSTS.
Military Sea Transportation Service, (Navy).
Top of the cloud formed from the fireball of a nuclear detonation.
M/V.
Motor vessel.
MWB.
Motor whale boat.
NAS.
Naval Air Station.
NAU.
Naval Administrative Unit, Sandia Base, New Mexico.
NavMed.
Naval Medical School, Bethesda, Maryland.
NBS.
National Bureau of Standards.
NCQ.
Noncommissioned officer.
NCRP.
health.
Abbreviation for milliroentgen.
mushroom cap.
Staeee ere PEN ty AMI i
One-thousandth of a roentgen.
National Committee on Radiation Protection and Measurements.
mittee on Radiation Protection.
NEL.
Before 1956 simply the National Com-
Naval Electronics Laboratory.
neutron. A neutral elementary particle (j.e., with neutral electrical charge) of approxima ly unit mass
j.e., the mass of a proton) that is present in at] atomic nuclei, except those of ordifhary (light)
hydrogen. Neutrons are required to initiate the fission process, and large numbers of ffeutrons are
produced by bath fission and fuston reactions in nuclear explosions.
neutron flux.
The
through 1 cm¢
NM&OSO.
NPG.
intensity of neutron radiation.
in 1 second.
It is expressed as the number of neutron
passing
Navy Medical and Dental Supply Office, Brooklyn Navy Yard, New York.
Nevada Proving Ground, now the Nevada Test Site (NTS).
NROL.
Naval Radiological Defense Laboratory.
NRL.
Naval Research Laboratory.
NRSTI.
Naval Receiving Station, Treasure Island, California.
NSC_TI.
Naval Schools Command, Treasure Island, California.
NTPR.
Nuclear Test Personnel Review.
NTS.
Nevada Test Site.
NUCCS.
Naval Unit, Chemical Corps School, Ft. McClellan, Alabama.
nuclear cloud.
See radioactive cloud.
nuclear device (or weapon or bomb).
Any device in which the explosion results from the energ
reactions involving atomic nuclei, either fission or fusion, or both.
and the H- (or hydrogen) bomb are both nuclear weapons.
Thus, the A- (or
It would be equally true to calf
released by
Btomic) bomb
them atomic
weapons, since the energy of atomic nuclei is involved in each case. However, it has beflome more or
less customary, although it is not strictly accurate, to refer to weapans in which all te energy results from fission as A-bombs.
In order to make a distinction, those weapons in which pirt of the
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