FLIR identiFINDER R300 - Page 285

FLIR Detection D. Glossary
Röntgen Equivalent in Man (rem)
The röntgen equivalent in man is an old unit of radiation ÚDose. (ÚSievert)
100 rem = 1 Sv
The continued use of rem is “strongly discouraged” by the U.S. National Institute of Standards
and Technology.
RT ÚReal Time
Scintillation Counter
A device to measure ÚIonizing Radiation by amplifying the light emitted from a ÚScintillator
with a
Ú
Photo Multiplier Tube and quantifying the result.
Scintillator
A material emitting a lash of light when it absorbs ÚIonizing Radiation.
Semiconductor Radiation Detector
A semiconductor (for example ÚGermanium or ÚCadmium Zinc Telluride) placed between
two electrodes registering electric pulses resulting from the travel of free electrons pro-
duced by incident ÚGamma Radiation. The number of free electrons is proportional to the
radiation’s energy.
SI (Système International d’Unités)
A metric and decimal system of units, standardized by the Bureau International des Poids et
Mesures (International Bureau of Weights and Measures).
Also known as: International System of Units
SI Prexes
ÚUnit Preixes
Sievert (Sv)
The ÚSI derived unit of dose equivalent. It attempts to relect the biological effects of
ÚIonizing Radiation as opposed to the physical aspects, which are characterized by the
ÚAbsorbed Dose (ÚGray).
1 Sv = 1
J
kg
= 1
m

s

For ÚGamma Radiation, these are the same base units as the ÚGray. To avoid confusion, do
not use J/kg but always Gy for the absorbed dose and Sv for the dose equivalent.
SIM Subscriber Identity Module, used for example in mobile phones.
Sodium Iodide (NaI)
Substance to build ÚScintillation Counters.
SOP ÚStandard Operating Procedure
identiFINDER
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