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Becquerel was conducting experiments with phosphorescent minerals. Expose them to sunlight and they glow for a while. He placed these materials on photographic plates which had heavy paper on them to stop the sunlight from penetrating and exposing the plates. He prepares some photographic plates and it was overcast for several days and he could not do the experiment. He placed the plates in a desk drawer the first day and after several days of bad weather, decided to develop the plates anyway. They had been exposed. He looked in the drawer and it contained some ore samples containing uranium. The radioactive decay of the uranium had penetrated the paper coverings and had exposed the plates.

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