D. Glossary FLIR Detection
24-Hour Clock
The ÚISO 8601 convention of time keeping dividing the day running from midnight to mid-
night into 24 hours. The notation indicates the hours passed since midnight from 0 to 23. (cf
Ú12-Hour Clock)
Also known as: Army Time, Military Time, Astronomical Time, Radio Time, Railway Time,
Continental Time
A ÚMass Number
𝛼 Particle
ÚAlpha Particle
𝛼 Radiation
ÚAlpha Radiation
Absorbed Dose
The amount of energy deposited in matter by ÚIonizing Radiation given in ÚGray. In contrast
to the ÚEquivalent Dose, the absorbed dose does not differentiate the biological effects of
the ionizing radiation.
Acrylic Glass
ÚPolymethyl Methacrylate
Activity
The number of disintegrations of an excited state in a ÚNucleus per duration given in
ÚBecquerel.
Activity Concentration
ÚSpeciic Activity
Adjustment
ÚCalibration
Alarm
An audible, visual, or other signal activated when an instrument reading or response exceeds
a preset value or falls outside of a preset range.
Alpha Particle
Two ÚProtons and two ÚNeutrons, strongly bound together. It is the ÚNucleus of the helium
atom
4
2
He. Alpha (𝛼) particles are commonly emitted during the ÚDecay of heavy ÚNuclei.
Also known as: 𝛼 Particle
Alpha Radiation
A ÚParticle Radiation of ÚAlpha Particles. Alpha radiation has a short range in matter, due
to its positive charge and heavy mass, being relatively easy to shield, for example by a sheet
of paper (Figure 245, p. 283). However, it poses a great health hazard when alpha radiators
are ingested by organisms.
268 identiFINDER
®
R300/en/2014.4(13623)/Feb2015
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