Geochronology/Argon–argon dating: Revision history

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2 April 2022

  • curprev 06:4006:40, 2 April 2022 imported>Marshallsumter 2,489 bytes +2,489 New resource with "The age of a sample is given by the age equation: :<math>t=\frac{1}{\lambda} \ln (J \times R+1)</math> where λ is the radioactive decay constant of <sup>40</sup>K (approximately 5.5 x 10<sup>−10</sup> year<sup>−1</sup>, corresponding to a half-life of approximately 1.25 billion years), J is the J-factor (parameter associated with the irradiation process), and R is the <sup>40</sup>Ar*/<sup>39</sup>Ar ratio. The J factor relates to the fluence of the neutron bombardm..."
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