Radioactive dating u 238 american women dating italian man
In 1907, the American chemist Bertram Boltwood demonstrated that he could determine the age of a rock containing uranium-238 and thereby proved to the scientific community that radioactive dating was a reliable method.
Uranium-238, whose half-life is 4.5 billion years, transmutes into lead-206, a stable end-product.
Boltwood explained that by studying a rock containing uranium-238, one can determine the age of the rock by measuring the remaining amount of uranium-238 and the relative amount of lead-206. The long half-life of uranium-238 makes it possible to date only the oldest rocks.
This method is not reliable for measuring the age of rocks less than 10 million years old because so little of the uranium will have decayed within that period of time.
A form of particulate ionizing radiation made up of two neutrons and two protons.
Although the half-life of rubidium-87 is even longer than uranium-238 (49 billion years or 10 times the age of the earth), it is useful because it can be found in almost all igneous rocks.Perhaps the best method for dating rocks is the potassium-40/argon-40 method.Potassium is a very common mineral and is found in sedimentary, metamorphic, and igneous rock.There are several methods of determining the actual or relative age of the earth's crust: examination of fossil remains of plants and animals, relating the magnetic field of ancient days to the current magnetic field of the earth, and examination of artifacts from past civilizations.
However, one of the most widely used and accepted method is radioactive dating.Elements in the periodic table can take on several forms.