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Spectrum of a Source
•
The source can emit alfa-
,beta and/or gamma
radiation
•
Sealed sources
: the alfa- and beta
radiation will be absorbed in the wall
of the source
•
The
type and the energy
of the
radiation is
unique for each
nuclide
and is called the spectrum of
the source
Largely replaced Ra-226 in the mid 1970s.
Caesium-137 is widely used in LDR brachytherpy and is available in several forms needles, tubes, pellets. Formed as
one of the more common fission products by the nuclear fission of uranium-235
Availability of sources suitable for remote afterloading devices has declined the use of
137
Cs as a LDR BT source.
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