Radioactivity in real life

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Radiation is typically measured using a Geiger Muller (GM) tube, which ticks for every radioactive particle it detects.
Radioactivity can be harmful to the human body but, if used in a controlled and careful manor, can provide helpful medical benefits.

Radioactivity has many applications in the real world and has played a role in many experiments throughout history since its discovery by Henri Beckquerel when he noticed Uranium salts leaving shadows on film.

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Explain the role of alpha radiation in the Rutherford scattering experiment.
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The image shows two tracks from two different particles in a cloud chamber, which is from the alpha particle and which is from the beta particle?

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A student measures 400 disintegrations in 20 seconds, what activity has the student measured?
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