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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 types we will discuss here are: alpha, beta, and gamma (listed in increasing ability to penetrate matter).
Alpha decay is seen only in heavier elements greater than atomic number 52, tellurium.
The following year, her daughter and son-in-law, Irene and Frederic Joliot-Curie, were awarded the Nobel Prize in Chemistry for their discovery of artificially induced radiation.The Curies’ radium salt glowed visibly from the radiation.This radiation took its toll on them and other unaware researchers, though.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.