Radioactive dating uranium lead

27 Jan

An element will undergo decay if: The concept of radioactive decay was first discovered in 1896 by Henri Becquerel as he was working the element uranium compounds.

In his first experiment, he placed the uranium on top of photographic film wrapped in dark paper and placed the crystals in the sunlight.

(Only a handful of nuclides with atomic numbers less than 83 emit an -particle.) The product of -decay is easy to predict if we assume that both mass and charge are conserved in nuclear reactions.

The product of this reaction can be predicted, once again, by assuming that mass and charge are conserved. They rapidly lose their kinetic energy as they pass through matter.

As soon as they come to rest, they combine with an electron to form two -ray photons in a matter-antimatter annihilation reaction.-decay are often obtained in an excited state.

After placing the uranium in an enclosed spot with no sunlight at all, Becquerel expected that the paper would be clear and free of dark spots.

Much to his surprise, the paper was darkened as if it had been exposed to the sun.