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Exposure (radiation)
Exposure
is a measure of the ionization of
air
due to
ionizing radiation
from
photons
, that is,
gamma rays
and
X-rays
. It is defined to be the
electric charge
freed by the radiation divided by the
mass
of the air. As a measure of
radiation damage
it is less useful than the analogous concept of
absorbed dose
, nevertheless since exposure is convenient to measure directly in
gaseous ionization detectors
and since it is easily converted to dose, it is commonly used in the
nuclear industry
.
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