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is based on the beta decay of rubidium-87 to strontium-87, with a half-life of 50 billion years.

old earth is reviewed and deficiencies of the uranium/lead method are discussed.there is no reason why the alteration zone should not extend into what is classified as the time clock zone (apart from a belief in 4.for rocks dating back to the beginning of the solar system, this requires extremely long-lived parent isotopes, making measurement of such rocks' exact ages imprecise.principles and applications of geochemistry: a comprehensive textbook for geology students (2nd ed. it is not widely appreciated, outside the ranks of those who work directly in geochronology or meteoritics that, judged by modern standards, the meteoritic lead-lead isochron is very poorly established.radioactive decay constants are believed to be unalterable, the requirement of an absolutely reproducible rate is hopefully met.Λ is the decay constant of the parent isotope, equal to the inverse of the radioactive half-life of the parent isotope[16] times the natural logarithm of 2.stimulating these mineral grains using either light (optically stimulated luminescence or infrared stimulated luminescence dating) or heat (thermoluminescence dating) causes a luminescence signal to be emitted as the stored unstable electron energy is released, the intensity of which varies depending on the amount of radiation absorbed during burial and specific properties of the mineral.

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