What did Willard Frank Libby invent when he observed that one in a trillion carbon atoms is radioactive and that these radioactive atoms decay at a constant rate?

What did Willard Frank Libby invent when he observed that one in a trillion carbon atoms is radioactive and that these radioactive atoms decay at a constant rate? Correct Answer a method for dating fossils

By observing that one in a trillion carbon atoms is radioactive and that these radioactive atoms decay at a constant rate, the chemist Willard Frank Libby invented a method for dating fossils known as carbon-14 (or radiocarbon) dating.

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In 1949 which technique was invented by chemist Willard Frank Libby to date Maltese temples and other archaeological sites?