Because the rate cannot be artificially changed in the laboratory, it is assumed that it always has been uniform for a given isotope. They assume that the rate of decomposition has always remained constant - absolutely constant. These calculations result in ages for the Earth of 4. Rubidium-strontium dating is not as precise as the uranium-lead method, with errors of 30 to 50 million years for a 3-billion-year-old sample. Geological Survey Bulletin No. Master Books,pp.
Does radioactive dating with isotopes of uranium and thorium provide an estimate of..?
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RADIOACTIVE AGE ESTIMATION METHODS—Do they prove the Earth is billions of years old?
Questions on earths history? These calculations result in ages for the Earth of 4. The fission tracks produced by this process are recorded in the plastic film.