FLIR identiFINDER R300 - Page 275

FLIR Detection D. Glossary
Geiger–Müller Tube (GM Tube)
A device to detect ÚIonizing Radiation consisting of a tube illed with low-pressure noble and
halogene gas in a strong electric ield. Incident radiation produces ÚIons which can be mea-
sured as electric current between the electrodes.
Germanium (Ge)
A substance used in high-precision ÚSemiconductor Radiation Detectors for ÚGamma Radi-
ation.
Global Positioning System (GPS)
A constellation of satellites sending microwave signals which enable receivers to determine
the time, their location, speed, and direction.
Also known as: Navstar Global Positioning System
GM Tube
ÚGeiger–Müller Tube
GMT ÚGreenwich Mean Time
GPS ÚGlobal Positioning System
Gray (Gy)
The gray is the ÚSI derived unit of ÚAbsorbed Dose due to ÚIonizing Radiation. One gray is
the absorption of one joule of energy, in the form of ionizing radiation, by one kilogram of
matter.
1 Gy = 1
J
kg
= 1
m

s

For ÚGamma Radiation, these are the same base units as the ÚSievert. To avoid confusion,
do no not use J/kg but always Gy for the absorbed dose and Sv for the ÚEquivalent Dose.
Greenwich Mean Time (GMT)
Originally the mean solar time at the Royal Observatory in Greenwich, London. It is commonly
but imprecisely used synonymously with ÚCoordinated Universal Time when referring to
time zones.
Gy ÚGray
Half Life
The duration it takes for a substance undergoing ÚDecay to decrease by half.
HAZMAT, Hazmat, HazMat
Hazardous materials and items, dangerous goods.
identiFINDER
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