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Let's look closely at how the half-life affects an isotope. Therefore, after one half-life, you would have 5 grams of Barium-139, and 5 grams of Lanthanum-139.After another 86 minutes, half of the 5 grams of Barium-139 would decay into Lanthanum-139; you would now have 2.5 grams of Barium-139 and 7.5 grams of Lanthanum-139.The half-lives of certain types of radioisotopes are very useful to know.They allow us to determine the ages of very old artifacts.A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.How do scientists know how old an object or human remains are?Half-lives for various radioisotopes can range from a few microseconds to billions of years.
It is used in dating things such as bone, cloth, wood and plant fibers that were created in the relatively recent past by human activities.Radiometric dating (often called radioactive dating) is a way to find out how old something is.The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. It is the main way to learn the age of rocks and other geological features, including the age of the Earth itself.Contamination from outside, or the loss of isotopes at any time from the rock's original formation, would change the result.It is therefore essential to have as much information as possible about the material being dated and to check for possible signs of alteration.
What methods do they use and how do these methods work?