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The rates of decay vary by element but can be measured in a laboratory.

The decay produces a daughter product, sometimes resulting in a different element or in other cases to a different isotope of the same element.

By knowing the decay rate, you can estimate the age of the rock by measuring the mass of the parent isotope versus the mass of the daughter isotope.

An example would be using the isotope of uranium U238 which decays to an isotope of lead Pb207. Potassium K40 decays to Argon Ar40 with a half-life of 1.25 billion years.

The process is for dating rocks using radioactive decay is known as radiometric age dating.

Radioactive elements occur naturally in the environment and decay at a constant rate that is not affected by forces such as temperature or pressure variations.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.So, we rely on radiometric dating to calculate their ages.So, if you know the radioactive isotope found in a substance and the isotope's half-life, you can calculate the age of the substance. Well, a simple explanation is that it is the time required for a quantity to fall to half of its starting value.So, you might say that the 'full-life' of a radioactive isotope ends when it has given off all of its radiation and reaches a point of being non-radioactive.

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