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However, radioisotope dating may not work so well in the future.Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely.You will be notified by email when the transcript and captions are available. Please contact cornellcast@if you have any questions about this request.

However, the principle of carbon-14 dating applies to other isotopes as well.

Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.

­ ­As soon as a living organism dies, it stops taking in new carbon.

The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced.

Carbon-14 has a half-life of 5,730 ± 40 years, meaning that every 5,700 years or so the object loses half its carbon-14.

Samples from the past 70,000 years made of wood, charcoal, peat, bone, antler or one of many other carbonates may be dated using this technique.Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.Name & Store: Josh Knowlton – Old Saybrook Hometown: Meriden, CT How do you spend your days? Each meal is designed, prepped, and packaged up in Maine (this author's favorite state! Stuff your clothes for the next day in your sleeping bag's stuff sack to use as a pillow. Depending on the day, I’m either on the river with my partner and friends, working on projects around my house, or riding my bike whenever possible through the Connecticut River Valley What are your hobbies? Until this century, relative dating was the only technique for identifying the age of a truly ancient object.