Throughout history two types of gamma ray detectors were
used the first being the Geiger- Mueller and the
second being scintillation, but lately only the second have
been used in the field

The operation principle of both of
them is as follows: a gamma ray strikes the crystal, a single photon of
Light is emitted ,This tiny flash of light then strikes a photocathode Each
photon hitting the photocathode releases a bunch of electrons .These, in turn,
are accelerated in an electric field to strike another electrode producing an
even bigger “shower of electrons”, This process is repeated through a
number of stages until a final electrode conducts a small current through a
measure resistor to produce a voltage pulse that can be measured .

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