PRESENTACIÓN ESTRELLAS

presentation

The danger of lead

- Attempts to measure the age of the Earth.- Measurement from the amount of Uranium and Lead in meteorites.- Uranium is easily measured and lead cannot be measured well.- Found to be due to lead contamination.- Patterson attempts to eliminate lead in gasoline.- Current situation and current measures.

Index

01

Attempts to measure the age of the Earth.

Attempts to measure the age of the Earth

Clair Patterson was assigned with George Tilton to date minerals from very small meteorites. They did this to calculate the age of the earth. At work Tilton measured the uranium, Patterson the lead.

02

Measurement from the amount of Uranium and Lead in meteorites

Tilton was getting the expected levels of uranium, but the lead values ​​Patterson measured were off the scale, even in samples where none of the metal should have been found.

Measurement from the amount of Uranium and Lead in meteorites

Uranium is easily measured and lead cannot be measured well

Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable. Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence.

Uranium is easily measured and lead cannot be measured well

Found to be due to lead contamination

The scientist realized that lead was everywhere, and decided to take samples from the ocean. In the deepest part there were no traces of lead, but it was beginning to contaminate.

Found to be due to lead contamination

Patterson attempts to eliminate lead in gasoline

Patterson attempts to eliminate lead in gasoline

The origin of everything being contaminated with lead was gasoline, which contained lead. For this reason Patterson tried to tell people and companies the problem of this.

Current situation and current measures

Currently, lead contamination only occurs in mining, in the metallurgy industry... Now, everything is much more regulated.

Current situation and current measures.

Thank you very much for the attention