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10
CH3041
GEIGER COUNTERS
• Monitoring of b
radiation is usually made with Geiger counters.
• Radiation strikes
an
argon atom which
ionises to form Ar+ + e-
argon atom which
ionises to form Ar+ + e-
cathode
anode
• The signal is
amplified
to give a click that
indicates a decay event.
to give a click that
indicates a decay event.
• g
radiation is monitored
with g-ray spectrometers.
with g-ray spectrometers.
These indicate the
radionuclide and the
radiation dose.
radionuclide and the
radiation dose.
Avalanche effect
1 e- releases
1010 e- in 1 ms
1 e- releases
1010 e- in 1 ms
