1. Either radiogenic heating might have provided the necessary energy source. 2. The helium isotopic pattern was consistent with a radiogenic , crustal origin. 3. They are the primary source of radiogenic heat and radioactive decay products. 4. Their decay products ('daughter'products ) are called radiogenic nuclides. 5. Radiogenic 107 Ag was first discovered in the Santa Clara meteorite in 1978.6. Radiogenic isotopes provide powerful tracers for studying the ages and origins of Earth systems.7. Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide. 8. The lower ratio was principally imparted by the low-radiogenic Pb upper crust. 9. Stable isotope tracers involve only non-radiogenic isotopes and usually are mass-dependent. 10. Isotopic tracers are usually subdivided into two categories : stable isotope tracers and radiogenic isotope tracers.
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