| 31. | Isotopic tracers are usually subdivided into two categories : stable isotope tracers and radiogenic isotope tracers.
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| 32. | The rest have more than one stable isotope.
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| 33. | Then most elements have several stable isotopes ( ie larger or fewer numbers of neutrons ).
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| 34. | All four stable isotopes are incorporated, in roughly the same proportions they are found in nature.
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| 35. | In 1918 he announced discovery of a stable isotope of Protactinium, working with John Arnold Cranston.
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| 36. | There are two main methods of removing both radioactive and stable isotopes of thallium from humans.
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| 37. | F . W . Aston discovered multiple stable isotopes for numerous elements using a mass spectrograph.
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| 38. | Elements 83 or higher have no stable isotopes.
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| 39. | The second quantitative approach uses stable isotope tags to differentially label proteins from two different complex mixtures.
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| 40. | This field is termed stable isotope geochemistry.
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