## What type of dating is U 238 to PB 206 used for?

radiometric dating Explanation: The ratio of the amounts of U 238 and Pb 206 in a rock sample enables the age of the rock to be estimated using the technique of radiometric dating. It moves back in the periodic table until the isotope falls in the band of stability at Pb 206.

## What can uranium-lead dating be used for?

Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range.

## What is uranium-lead dating and what is the half-life of uranium 238 and 235?

The half-life of uranium 238 is of 4.5 billion years, while uranium 235 has a half-life of only 700 million years. Though both isotopes were at the time of Earth formation equally abundant, natural uranium today consists today of 99.3% uranium 238 and only 0.70% uranium 235.

## How long does it take for 50% of U-238 to decay to PB 206?

about 4.5 billion years After conducting careful measurements on large numbers of U-235 atoms, scientists determined that each U-238 atom has a 50% chance of decaying into Pb-206 during about 4.5 billion years. In other words, the half-life of U-238 is 14 billion years.

## How old would a sample with 50% uranium 238 and 50% lead 206 be?

After a second half-life, the 50 gm of U-238 would drop to 25 while the 50 gm of Pb-206 would increase to 75. Thus, two half lives. Since the half-life of U-238 is 4.5 Billion years, this rock must be 9 BY old. 1d.

## How long does it take for 50 of U 238 to decay to PB 206?

about 4.5 billion years After conducting careful measurements on large numbers of U-235 atoms, scientists determined that each U-238 atom has a 50% chance of decaying into Pb-206 during about 4.5 billion years. In other words, the half-life of U-238 is 14 billion years. Why does decay occur?