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Radioisotope dating equation

U decay in those rocks added daughter Pb isotopes to the common or initial Pb isotopes in them, inherited from the rock’s sources.

Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.In developed countries (a quarter of the world population) about one person in 50 uses diagnostic nuclear medicine each year, and the frequency of therapy with radioisotopes is about one-tenth of this.Nuclear medicine uses radiation to provide information about the functioning of a person's specific organs, or to treat disease.Over 10,000 hospitals worldwide use radioisotopes in medicine, and about 90% of the procedures are for diagnosis.The most common radioisotope used in diagnosis is technetium-99 (Tc-99), with some 35 million procedures per year, accounting for about 80% of all nuclear medicine procedures worldwide.

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However, problems remain in the interpretation of the measured Pb isotopic ratios to transform them into ages.