Remember, the half-life is the time it takes for half of your sample, no matter how much you have, to remain. The only difference is the length of time it takes for half of a sample to decay. Understand how decay and half life work to enable radiometric dating. Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object. There are two types of half-life problems we will perform.
How Old is the Earth
Inventions and Discoveries List
Through decay Uranium turns into stable Lead Because its half-life is so long it is useful for dating the oldest rocks on Earth, but not very reliable for rocks under 10 million years old. Rubidium Rubidium 87 has a half life of 49 billion years! This is ten times the age of the Earth, so very little Rubidium has decayed at all. Finding the age of an object using radiometric dating is a four step process. As long as you follow these four steps you will always be able to accurately determine the age of a rock or fossil. How many half-lives have gone by?
Dating methods in Archaeology. Are they accurate?
Ever heard of Plutonium? It's the stuff we use in our nuclear things -- weapons, submarines, etc. Plutonium has a half-life of 24, years. In 24, years, you'd still have 50 pounds left In another 24, years, you'd still have 25 pounds left.
The term Half Life Time was coined in The Half Life Time is the amount of time it takes for half of the atoms in a sample to decay. Half Life is a characteristic of each radioactive isotope. Depending on the isotope, its Half Life may range from a few fractions of a second to several billion years. The Half Life of Uranium is ,, years.