The flux of neutrons converted the Potassium-39 in feldspar into Argon-39, which then acted as a proxy for potassium in the dating process. The sample was heated to release trapped gases ...

However, scientists discovered in the 1960s that they could irradiate a rock sample with neutrons and thereby convert the potassium-40 to argon-39, an isotope not normally found in nature and ...

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