| 21. | Radium has its origins as a decay product of certain isotopes of uranium and thorium.
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| 22. | The primary decay product before 106 Pd is rhodium and the primary product after is silver.
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| 23. | The lightest isotopes were synthesized by direct fusion between two lighter nuclei and as decay products.
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| 24. | Furthermore its decay product, helium-3, absorbs neutrons if exposed to the ones emitted by nuclear fission.
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| 25. | Radon is a decay product of radium which in turn is a decay product of uranium.
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| 26. | Over the long term, also forms in spent nuclear fuel as the decay product of americium-241.
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| 27. | All uraninite minerals contain a small amount of radium as a radioactive decay product of uranium.
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| 28. | The primary decay product before 102 Ru is technetium and the primary product after is rhodium.
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| 29. | Radon is a decay product of radium which in turn is a decay product of uranium.
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| 30. | Thus neptunium is present in nature in negligible amounts produced as intermediate decay products of other isotopes.
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