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Since all of these factors affect electrons in an atom, the radiation cannot come from electron transitions, as atomic spectra do.

In 1898, Marie Curie began her doctoral study of Becquerel’s rays.

The other two types of decay are seen in all of the elements.

Table of modes of radioactive decay: Radionuclides can undergo a number of different reactions, summarized here.

Marie’s radioactive fingerprints on some pages of her notebooks can still expose film.

Marie suffered from radiation-induced lesions and died of leukemia, likely caused by radiation.

The types we will discuss here are: alpha, beta, and gamma (listed in increasing ability to penetrate matter).

The column “Daughter nucleus” indicates the difference between the new nucleus and the original nucleus.

This means that rays carry energy, but pitchblende emits them continuously without any energy input.

This is an apparent violation of the law of conservation of energy.

Radioactive decay occurs when an unstable atomic nucleus loses energy by emitting energy in the form of emitted particles or electromagnetic waves, called radiation.

Isotopes are atoms of the same element (thereby having the same number of protons) which differ in the number of neutrons in their nucleus.




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