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Actinium

89
Ac
Action-Actum
Actinium

The name actinium comes from the greek word aktis meaning "ray", because it generates radioactive rays and glows in the dark. It is name patron for a whole group of elements: the actinides. Because of its strong radioactivity there are only a few very special applications for it.

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Actinium-225 medical radioisotope held in a v-vial at Oak Ridge National Laboratory:

Actinium sample (31481701837)