. . "radioactive dating"^^ . . . "01004377-n"^^ . "measurement of the amount of radioactive material (usually carbon 14) that an object contains; can be used to estimate the age of the object"@en-us . . "0"^^ . "radioactive dating"@en-us . "0"^^ . . "100945944"@en-us . "101004377"^^ . . .