Appendix H
Nuclide Library
Refer to chapters 2.3.3, p. 15, 3.2.3, p. 30 and 3.3.3, p. 35 for further in-
formation. Refer to Appendix I, p. 149 for Isotopes included in Extended
library.
(BG) Background
Naturally occurring radioactive material
The ubiquitous background radiation is
emitted from a variety of mostly natural
and some artificial sources such as un-
stable isotopes contained in most chemi-
cal elements comprising the lithosphere,
biosphere, and atmosphere; cosmic radi-
ation from outer space; and applications
of nuclear technology for weapons, power
plants and medicine. The background
recorded by an instrument is, of course,
spoiled by non-natural sources present
while measuring the background.
to be continued. . .
Thermo Fisher Scientific Interceptor™/en/5.1(4956)/Feb2010 141
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