D. Glossary
FLIR Detection
24-Hour Clock
The
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
Ú
Also known as:
Army Time, Military Time, Astronomical Time, Radio Time, Railway Time,
Continental Time
A
Ú
𝛼
Particle
Ú
𝛼
Radiation
Ú
Absorbed Dose
The amount of energy deposited in matter by
Ú
given in
. In contrast
to the
, the absorbed dose does not differentiate the biological effects of
the ionizing radiation.
Acrylic Glass
Ú
Activity
The number of disintegrations of an excited state in a
per duration given in
Ú
Activity Concentration
Ú
Adjustment
Ú
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
and two
Ú
Neutrons
, strongly bound together. It is the
of the helium
atom
4
2
He. Alpha (
𝛼
) particles are commonly emitted during the
Ú
of heavy
Ú
Also known as:
𝛼
Particle
Alpha Radiation
A
of
Ú
. 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