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Abstract
Potassium has three isotopes (see Potassium); potassium-40 ( 40K) is radioactive and decays to both calcium-40 ( 40Ca) and argon-40 ( 40Ar). The combined half-life of 40K is 1.25 billion years. The branched decay scheme of 40K is shown in Figure P33. It decays by β- decay to 40Ca and to 40Ar by both electron capture and positron decay (see Potassium-argon decay system). Although 89.52% of the decays produce 40Ca, the system is of somewhat limited use due to the large natural abundance of 40Ca (96.9% of calcium, see Calcium).
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Potassium-calcium decay system |
| DOI | 10.1007/1-4020-4496-8_260 |
| Year Published | 1999 |
| Language | English |
| Publisher | Springer |
| Contributing office(s) | Geology, Geophysics, and Geochemistry Science Center |
| Description | 2 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Encyclopedia of geochemistry |
| First page | 525 |
| Last page | 526 |
| Google Analytic Metrics | Metrics page |