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caesium-137
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Caesium-137
Caesium-137
(, Cs-137),
cesium-137
, or
radiocaesium
, is a
radioactive
isotope
of
caesium
which is formed as one of the more common
fission products
by the
nuclear fission
of
uranium-235
and other
fissionable
isotopes
in
nuclear reactors
and
nuclear weapons
. It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves and spreads in nature due to the high water solubility of caesium's most common
chemical compounds
, which are
salts
.
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