Rubidium (87Rb) in rocks or single minerals undergoes beta decay to generate the stable isotope 87Sr. According to the determination of the content of the parent isotope 87Rb (or Rb element) and daughter isotope 87Sr (or Sr element) and the strontium isotope ratio in the sample, the time since the sample formed a closed system can be calculated according to the law of radioactive decay, that is, rock or single Time since mineral formation.
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