Radioactivity is measured by
A. GM Counter
B. Polarimeter
C. Calorimeter
D. Colorimeter
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Correct option (a) GM Counter
Explanation:
A Geiger counter (Geiger-Muller tube) is a device used for the detection and measurement of all types of radiation: alpha, beta and gamma radiation. Basically it consists of a pair of electrodes surrounded by a gas. The electrodes have a high voltage across them.