Which of the following can be used for detecting a radioactive emanations?

A person's DNA

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A block of lead

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A Geiger counter

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An x-ray machine

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Graphite and heavy water

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Solution

The correct option is B A Geiger counter
A Geiger counter can be used for detecting a radioactive emanations.
Measurement and detection of radioactivity can also be carried out by following methods :
(1) Wilson Cloud chamber method
(2) Dosi meters
Radioactive emissions ionize the gases, so the degree of ionisation of a gas is taken as a measurement of the rate of emission of particles (alpha, beta or gamma).

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