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The instrument used to measure the radioactivity is

Q. The instrument used to measure the radioactivity is

 A   Geiger counter
 B   Radio compass
 C   Radio micrometer
 D   Radar
Answer:-Geiger counter
Explanation:  

Geiger counters are devices that detect radioactivity, another term for ionizing radiation, the four major types of which include Gamma, X-rays, Beta, and Alpha radiation. Virtually all Geiger counters detect Gamma and X-rays, while some models detect Alpha and Beta radiation as well.

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