What are radioactive isotopes instead of C14?

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giorgiana1976 | College Teacher | (Level 3) Valedictorian

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Due to C14 half-life, we can date objects that are not older than 60,000 years. The dating method using radioactive isotopes could be extended, however, to other instable chemical elements that have longer half-lifes: potassium-40 (half life of 1.3 billion years), uranium-235 (half life of 704 billion years), thorium (half life of 14 billion years).