The discovery of radioactivity.

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definition

Radioactivity is the process by which an unstable atom emits radiation in the form of alpha, beta or gamma radiation.

DISCOVERY

In his report to the French Academy of Science published in 1858, the French photographic inventor Claude Félix Abel Niépce de Saint-Victor discovered radioactivity by conducting the following experiment:

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DISCOVERER

Here is a photograph of Niépce de Saint-Victor:

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(1805-1870)

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