SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Nuclear decay chain, neptunium series. Diagram of the nuclear decay chain of neptunium-237 (Np-237) with isotopes (shown by chemical symbols) plotted by mass number (A) against atomic number (Z). Isotopes are colour-coded by their primary decay route (purple, red arrows: alpha decay; blue, blue arrows: beta decay). Decays are rare (dotted lines) or dominant (solid lines). The dominant route (yellow) ends with the stable (green) thallium-205 (Tl-205). Other elements in this decay chain are: uranium (U), protactinium (Pa), thorium (Th), actinium (Ac), radium (Ra), francium (Fr), astatine (At), polonium (Po), bismuth (Bi), and lead (Pb).
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