Scintillation counter use radiations or light energy to cause the emission of
electrons from a surface called the scintillator, the operation state with few electrons and multiplies as the process
continues, the electrons need to
accumulate and be large enough before an impulse can be produced. The electric pulses
are further amplified. In scintillation counter even individual radiation of
low energy can still be counted.
In scintillation counter the electrons produced are
proportional to the energy of the gamma ray while in GM counter it is independent
of the voltage applied.
Where as Geiger counter
uses use applied voltage to cause the emission of electrons. In Geiger muller,
a high voltage is applied so that even a
single ion pair can produced by a single incident particle can produce a
discharge , Geiger counter produces large impulse that require no
amplifications. Gm counter does not give any information about the particles
that produced a count.
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