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...September scientific dating in archaeology tsuneto nagatomo nara university of education age determination relative stratigraphy typology absolute historical data by natural methods numerical chronometric radiometric radioactive isotope radiocarbon potassium argon uranium series radiation damage fission track luminescence electron spin resonance non chemical change amino acid obsidian hydration archaeomagnetism and paleomagnetism dendrochronology fluorite isotopes the clock is directly provided decay e g number a nuclide n at certain time t decreases decaying into its daughter dn which short dt proportional to total d where constant then derived from as exp half life thus when values are known elapsed easily obtained evaluating value technique typical one decrease parent measure on other hand increase or their ratio principle some radioisotopes al ka cl be si ca could available for but not yet practical use c carbons consist among them only decays stable nitrogen with years produced up...