| 21. | By Dec . 17 they had worked out the complete decay chain for their new element.
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| 22. | Nihonium was discovered in the decay chain of moscovium, which produced a few precious atoms of nihonium.
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| 23. | Each decay chain has a unique half-life, which means the daughter isotopes are generated at different rates.
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| 24. | Much smaller trace amounts of the short-lived nuclear isomer protactinium-234m occur in the decay chain of uranium-238.
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| 25. | After prompt fission neutron emission the residual fragments are still neutron rich and undergo a beta decay chain.
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| 26. | Alpha particles that produce nucleogenic reactions come from natural alpha particle emitters in uranium and thorium decay chains.
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| 27. | Three elements and their decay chains are responsible for the radiation emitted by rock : potassium, thorium and uranium.
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| 28. | Of the 94 naturally occurring elements, 83 are primordial and 11 occur only in decay chains of primordial elements.
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| 29. | Unlike all the other intermediate elements in the aforementioned decay chains, radon is, under normal conditions, gaseous and easily inhaled.
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| 30. | U-series isotopes are unique amongst radiogenic isotopes because, being in the U-series decay chains, they are both radiogenic and radioactive.
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