It measures how much radioactive carbon a living thing has lost since it died or, in the case of anthrax spores, since they went into suspended animation.
22.
With nuclear physicists'tenuous prediction of a " long-lived radioactive carbon isotope ", Ruben and Kamen pursued several routes that could lead to identification of the carbon-14 isotope.
23.
A radioactive carbon test performed in Canada several years ago also suggests that the mummy is about 3, 200 years old, give or take a few hundred years.
24.
The concentric sculptured lines on the shell have been shown by radioactive carbon and oxygen dating to occur annually and have been used to tell the age of the animal.
25.
This is the second time that pinhead-size samples taken from Dead Sea Scrolls have been submitted to Carbon-14 testing, which measures the age of objects by their radioactive carbon content.
26.
Plants naturally contain radioactive carbon-14 ( 14 C ), but in a banana containing 15 grams of carbon this would give off only about 3 to 5 beta rays per second.
27.
Two weeks ago, an FDA advisory committee discussed, then declined to approve, a method that uses radioactive carbon-14, to test for H . pylori in exhaled breath, saying it needed further testing.
28.
Organic matter in the samples would allow them to use techniques based on radioactive carbon to determine the dates when past quakes have struck _ and thereby to peer into the future.
29.
Ever since the dawn of the atomic era, scientists have used the decay rate of radioactive carbon to determine the age of organic materials like ancient plants, wooden tools, and human and animal bones.
30.
The age of this mastodon makes it a rare find but also makes radioactive carbon dating impossible since that is accurate only to about 500, 000 years, according to UNR graduate student Tom Mantean.
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