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adiological defence
radiological defence Measures taken against radiation
hazard resulting from use of NW and RW.
radiological survey Directed effort to determine distribution
and dose rates of radiation in an area. Hence **
flight altitude.
radiological weapons Established forms of radioactive
materials or radiation-producing devices, including intentional
employment of NW fallout, to cause casualties
or restrict use of terrain; abb. RW.
radiology Science of ionizing radiation in treatment of
disease.
radio loop D/F loop aerial.
radioluminescence Emission in visible EM range, typically
with characteristic hues, in radiation from
radioactive materials.
radio-magnetic indicator Magnetic and radio panel
instrument in which card (dial) rotates so that heading
appears opposite index mark at top of case while needle
rotates to show magnetic bearing (QDM) of tuned
beacon.
radio marker beacon See marker.
radio mast Mast projecting above or below aircraft, esp.
older aircraft, usually as one anchor for MF/HF wire
aerial. Modern VHF blade seldom thus termed.
radiometeorograph Meteorograph transmitting readings
by radio (see radio-sonde).
radiometer Instrument for detecting, and usually also
measuring, IR and closely related radiation (see
bolometer, actinometer, photometer).
radiometric resolution This is usually measured in bits.
radio navigation All uses of radio to determine location,
obtain heading information and warn of obstructions or
hazards.
radionuclide Nuclide spontaneously emitting radiation.
radiophotoluminescence Photoluminescence exhibited
by substance after irradiation by radionuclide or other
source of beta or gamma rays.
radio proximity fuze See proximity fuze.
radio range Original radio navaid (US), a land (rarely,
ship) fixed station of aeronautical radio service broadcasting
continuous coded signals which on one side of an
airway are heard as a Morse N (-·) and on other as A (·-);
in a less common system signals are I (··) and A. In the
equisignal zone along centre of airway both signals
combine, A and N forming continuous note and I and A
cancelling to send no signal to pair of reeds which, as soon
as aircraft strays from centreline, vibrate visually and
aurally. Now replaced by VOR and later navaids.
radio rangefinding Use of radio (essentially in this case
not radar) to determine range.
radio-range orientation Technique needed when flying
radio range of finding and identifying station and then
accurately flying correct leg to next station or destination.
radio recognition Determination by radio means of
another station’s identity; DoD wording is ‘friendly or
enemy character, or individually, of another’.
radioresistance/radiosensitivity Measures of resistance
or sensitivity of living cells to injurious radiation.
radio silence Period during which some or all RF
emitters (eg of military force) are kept inoperative.
radio-sonde Instrumentation for measurement of
atmospheric data, usually temperature, pressure and
humidity, carried aloft by balloon together with electronics
for converting answers into code for RF
Radpac
transmission to ground station at intervals (see radarsonde).
radio sonobuoy Sonobuoy which transmits information
to friendly receivers.
radio telegraphy Transmission of telegraphic codes by
radio; often one word.
radio telephony Transmission of speech by radio, R/T,
often one word.
radio-telephony network Integrated group of aeronautical
fixed stations which use and guard frequencies from
same family and co-operate to maximize reliability of
air/ground communications.
radio telescope Radio receiver capable of greatly amplifying,
recording and determining source-direction of
radio waves received on Earth from outer space.
radio waves EM radiation with wavelengths from tens of
kilometres (VLF) down to tens of microns (above EHF,
so-called decimillimetric waves). See Appendix 2.
radius See radius of action.
radius block Steel block with edge of accurate radius for
sheet-metalwork.
radius dimpling Pressing dimples in thin sheet with
hemispheric or cone-shaped mating tools.
radius gauge Hand instrument for measuring inside or
outside-bend radii.
radius of action Maximum distance aircraft can travel
away from its base along given course with normal
combat load and return without refuelling, allowing for
all safety and operating factors. Today, esp. with gasturbine
propulsion, *** varies greatly with mission
profile, fuel consumption being several times higher in lo
regime with afterburner lit.
radius of damage Radius from ground zero within which
there is 50% probability of achieving desired damage.
radius of gyration Distance from body’s centre of
gyration to selected axis; square root of ratio of moment
of inertia, about selected axis, divided by mass.
radius of integration Radius from ground zero within
which effects of NW and conventional weapons are to be
integrated.
radius of safety Horizontal distance from ground zero
within which NW effects on friendly troops are unacceptable.
radius of turn For conventional aeroplane R = V 2 / g tan
θ where V is TAS and θ is angle of bank.
radius rod Major bracing strut in retracting landing
gear; normally pivoted near lower end of main leg and
upper end pinned to backlink, actuator or sliding block,
but many arrangements all with same name.
radius vector Vector connecting body with object which
may have relative motion; specif., vector joining primary
body to satellite, as in Earth/Moon system.
radix point In any number system, index separating
numbers having negative powers from those having
positive; eg decimal point, binary point.
Radnet Radar-data interchange network [Eurocontrol].
radome Protective covering (and in aircraft aerodynamic
fairing) over radar or other aerial, esp. one with
mechanical scanning; made of dielectric material selected
according to operating wavelength and other factors.
Radop Radar/optical tracking methods.
Radot Recording automatic digital optical tracker.
Radpac Radar package (Panavia); versatile software to
extend radar capability, esp. in air-to-air missions.
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