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**dating**method depends in part on the half-life of the

**radioactive**isotope involved. For instance, carbon-14 has a half-life of 5,730 years. After an organism has been dead for 60,000 years, so little carbon-14 is left that

**accurate dating**cannot be established.

In this way, why radiometric dating is not accurate?

Here is yet another mechanism that can cause trouble for **radiometric dating**: As lava rises through the crust, it will heat up surrounding rock. Lead has a low melting point, so it will melt early and enter the magma. This will cause an apparent large age. Uranium has a much higher melting point.

**most**widely used and well-known absolute

**dating techniques**is carbon-14 (or radiocarbon)

**dating**, which is used to

**date**organic remains. This is a radiometric

**technique**since it is based on radioactive decay.

In this way, why is radiometric dating the most reliable method?

**Radiometric dating** is a **method** used to **date** rocks and other objects based on the known decay rate of **radioactive** isotopes. The two uranium isotopes decay at different rates, and this helps make uranium-lead **dating** one of the **most reliable methods** because it provides a built-in cross-check.

This includes factoring in many variables, such as the amount of radiation the object was exposed to each year. These **techniques** are **accurate** only for material ranging from a few thousand to 500,000 years old — some researchers argue the **accuracy** diminishes significantly after 100,000 years.