A device used for the measurement of radioactivity is [BHU 1979]

1.	A device used for the measurement of radioactivity is [BHU 1979]
A.	Mass spectrometer
B.	Cyclotron
C.	Nuclear reactor
D.	G.M. counter
Answer» E.

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A device used for the measurement of radioactivity is [BHU 1979]

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