MDA GLOSSARY, VER. 4.0 R
241
R&A Reliability and Availability.
R&D Research and Development.
R&M Reliability and Maintainability.
R-T Real Time.
R/ASR Review as Required.
R/W Read/Write.
R2 (1) Recovery and Reconstitution. (2) Reporting Responsibility.
R2P2 Rapid-Retargeting/Precision Pointing (simulator).
R3 Rotary Reciprocating Refrigerator.
RAA Risk Approval Authority.
RAAF Royal Australian Air Force.
RACE Research in Advanced Communications in Europe.
RAD (1) Radiation Absorbed Dose. (2) Radiation Accumulated Dose.
Rad Hard Radiation Hardened.
Radar (Formerly an acronym for Radio Detection and Ranging.) A technique for detecting
targets in the atmosphere or in space by transmitting radio waves (e.g.,
microwaves) and sensing the waves reflected by objects. The reflected waves
(called "returns" or "echoes") provide information on the distance to the target
and the velocity of the target, and also may provide information about the shape
of the target.
Radar Beacon A receiver-transmitter combination which sends out a coded signal when
triggered by the proper type of pulse, enabling determination of range and
bearing information by the interrogating station or aircraft.
Radar Cross
Section (RCS)
Area of an object as scanned by radar; measured in square meters.
Radar Netting The linking of several radars to a single center to provide integrated target
information.
RADC (1) Region Air Defense Commander. (2) OBSOLETE. Rome Air Development
Center. (Now called Rome Laboratory.)
RADEC Radiation Detection Capability.
RADHAZ (1) Electromagnetic Radiation Hazard. (2) Hazards form electromagnetic
radiation.
Radiant
Exposure
The total amount of thermal radiation energy received per unit area of exposed
surface; it is usually expressed in calories per square centimeter.
MDA GLOSSARY, VER. 4.0 R
242
Radiation (1) The emission and propagation of waves transmitting energy through
space or through some medium; for example, the emission and
propagation of electromagnetic, sound, or elastic waves.
(2) The energy transmitted by waves through space or some medium; when
unqualified, usually refers to electromagnetic radiation. Also known as
radiant energy.
(3) A stream of particles, such as electrons, neutrons, protons, alpha
particles, or high-energy photons, or a mixture of these. (See Ionizing
Radiation, Nuclear Radiation, and Thermal Radiation.)
Radiation
Hardening
Protection of a particular system, subsystem, or component from functional
damage due to the effects of nuclear (or other) radiation by shielding the
vulnerable components from the radiation, or using other passive techniques in
manufacturing effects of nuclear (or other) radiation.
RADIC System Rapidly Deployable Integrated Command and Control System.
RADINT Radar Intelligence.
Radio Blackout
(RBO)
The complete disruption of radio (or radar) signal over large areas caused by the
ionization accompanying a high altitude nuclear explosion, especially above
about 40 miles.
Radioactive (or
Nuclear) Cloud
An all-inclusive term for the volume of hot gases, smoke, dust, and other
particulate matter from the nuclear weapon itself and from its environment, that is
carried aloft in conjunction with the rising fireball produced by the detonation of a
nuclear weapon.
Radioactivity The spontaneous emission of radiation, generally alpha or beta particles, often
accompanied by gamma rays, from the nuclei or an unstable isotope.
RADOT Recording Automatic Digital Optical Tracker.
RAG Red-Amber-Green (MDA/POC assessment term).
Rail Gun (RG) A weapon using metallic rails and electromagnetic energy to fire hypervelocity
projectiles.
RAM (1) Reliability, Availability, and Maintainability. (2) Random Access Memory
RAMA (1) Reliability, Availability, and Maintainability.
(2) Random Access Memory.
(3) Radar Absorption Material.
RAMOS (1) Russian-American Observation Satellite.
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