When is an isotope unstable (radioactive)?
1. All Nuclei with Z > 84 are Unstable
2. Very stable isotopes have “magic” Z
2, 8, 20, 50, 82 or 126
3. Isotopes are stable in the “zone of stability”
Anthropogenic Occuring Radionuclides
Nuclear fission reactions
atomic bombs (incl. waste from weapons production)
nuclear fission reactor fuel
Americium -241 – Cesium -137 – Cobalt-60 – Iodine – Plutonium – Radium – Radon – Strontium – Technetium Thorium – Tritium – Uranium
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