FLIR identiFINDER R300 - Page 288

D. Glossary FLIR Detection
Units of Time
The ÚSI base unit for time is the second. It may be preixed with the usual SI ÚUnit Preixes
to express smaller or larger quantities.
Units known from everyday life (Table 5, p. 288) are often used for larger quantities.
Table 5. Units of time
Unit Symbol Relation
Second sec, s
Minute min, m 60 sec
Hour h 60 min
Day d 24 h
Year a 365.25 d
The Year is often preixed (see Table 4, p. 287) to express very large quantities like 1.3 Ga for
1.3 billion years (the ÚHalf Life of
40
K).
Universal Serial Bus
ÚUSB
URI ÚUniform Resource Identiier
USB (Universal Serial Bus)
A speciication to establish communication between various types of devices and a host con-
troller, usually a personal computer.
UTC ÚCoordinated Universal Time
Weapons-Grade Plutonium (WGPu)
A mixture of
239
Pu,
240
Pu and other ÚIsotopes, which contains less than 7 %
240
Pu. Due to its
reduced amount of the spontaneous ission source
240
Pu, the risk of a premature chain reac-
tion start is decreased so that this blend of Plutonium is used for the weapon head assemblies.
Further grades are ÚFuel-Grade Plutonium and ÚReactor-Grade Plutonium.
WGPu
ÚWeapons-Grade Plutonium
WGS84
ÚWorld Geodetic System
World Geodetic System (WGS84)
A standard for use in cartography, geodesy, and navigation comprising a coordinate system
for the Earth, a reference surface for raw altitude data, and a geoid deining the nominal sea
level.
The WGS release of 1984 with later revisions is used by ÚGlobal Positioning System.
288 identiFINDER
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R300/en/2014.4(13623)/Feb2015