Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not ?
Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not ?
(a) Microscope (b) Lead plate (c) Scintillation counter (d) Spectrophotometer
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(c) Scintillation counter (scintillometer) : An instrument which measures gamma radiation. It is also used in airborne and ground radiometre surveys. This instrument utilizes the flash of light emitted when the atoms of a suitable ' phosphor' are energized by gamma rays. The scintillations are detected by a light - sensitive cathode.
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