| 1. | Either radiogenic heating might have provided the necessary energy source.
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| 2. | The helium isotopic pattern was consistent with a radiogenic, crustal origin.
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| 3. | They are the primary source of radiogenic heat and radioactive decay products.
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| 4. | Their decay products ('daughter'products ) are called radiogenic nuclides.
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| 5. | Radiogenic 107 Ag was first discovered in the Santa Clara meteorite in 1978.
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| 6. | Radiogenic isotopes provide powerful tracers for studying the ages and origins of Earth systems.
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| 7. | Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide.
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| 8. | The lower ratio was principally imparted by the low-radiogenic Pb upper crust.
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| 9. | Stable isotope tracers involve only non-radiogenic isotopes and usually are mass-dependent.
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| 10. | Isotopic tracers are usually subdivided into two categories : stable isotope tracers and radiogenic isotope tracers.
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