radioactive clock

radioactive clock

[¦rād·ē·ō′ak·tiv ′kläk]
(nuclear physics)
A radioactive isotope such as potassium-40 which spontaneously decays to a stable end product at a constant rate, allowing absolute geologic age to be determined.
Mentioned in ?
References in periodicals archive ?
The researchers also dated the Sudbury rocks using the samarium-neodymium radioactive clock to obtain an age of 1.