# Using uranium 238 in radiometric dating

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 dating to work, scientists have to make three assumptions.

These assumptions are that the system being dated is a closed system; at the beginning of the time period, there are no daughter isotopes present; and the rate of radioactive decay stays the same through the whole time period.

This diagram has been made by using the ratio of uranium to lead of all the rocks dated with this method and their assumed age.

One assumption is to use a worldview that uniformitarianism is accepted Where is the time from starting point, the original amount of uranium, the amount of uranium at the measurement, the original amount of lead, the amount of lead at the measurement, the rate uranium changes to lead, the average rate of loss and gain in the amount of lead, the average rate of loss and gain in the amount of uranium..

Like all radiometric dating methods, uranium-lead dating has a range that it works best.

The three main parameters that have to be set are the original amount of uranium and lead in the sample, the rate at which uranium and lead enter and leave the sample, and how much the rate of decay changes.

Uranium-lead dating uses four different isotopes to find the age of the rock.