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It also implies that none of the factors that might affect the rate of the radioactive decay could not. If the ages this dating process generates are true, it gets harder to assume that nothing on the outside of the sample has any effect on the system.
After a few million or billion years of a near-closed system, it will have a large error.
For uranium-lead has a range of 10 million to 4.6 billion years.
This means that to begin with, any rock dated with this process will be in the 10's of millions .
Assuming a closed system means that nothing on the outside of the rock affected the sample.
Another benefit is that zircon has been found in most igneous rocks.
Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock.