from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a radioactive isotopes of carbon, 146C, having six protons and eight neutrons; it is used in radiocarbon dating
from the GNU version of the Collaborative International Dictionary of English
- n. a radioactive isotope of carbon with a half-life of 5730 years. It occurs naturally in minute quantities, and is used as the basis for radiocarbon dating.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a radioactive isotope of carbon
Sorry, no etymologies found.
However, about one atom in a trillion is carbon-14, which is radioactive.
All living creatures, whether plants or animals, have approximately the same ratio of carbon-12 to carbon-14, which is the same ratio as you’ll find in the atmosphere.
In addition, minute fragments of bone were sent for carbon-14 testing by experts unaware of their provenance.
The prize in 1960 was given to Willard F. Libby of the University of California, Los Angeles (UCLA), for his method to determine the age of various objects (of geological or archeological origin) by measurements of the radioactive isotope carbon-14.
Since plastic debit cards didn't yet exist, Mr. Shepherd-Barron's machine used paper checks impregnated with a radioactive element called carbon-14.
The medieval cotton fibers interwoven into the sample could well have accounted for the carbon-14 test result that dated the Shroud somewhere around 1260 to 1390 A.D.
“Today I am here to announce that I have successfully reproduced the Shroud of Turin using only materials and methods known to be available to medieval forgers who were working in the period between 1260 and 1390 A.D., the dates the carbon-14 tests done on the Shroud have established for its date of creation.”
“So how did Rogers prove the 1988 carbon-14 sample was different from the main body of the Shroud?”
When an outspoken expert like Rogers, who played a lead role in the 1978 STURP chemical analysis of the Shroud, publicly changed his mind on the accuracy of the radiocarbon dating, I began to doubt whether the carbon-14 results were representative of the Shroud as a whole.
“All I need to prove is that I can produce today something that looks very much like the Shroud of Turin by using only materials that were known to exist when the carbon-14 tests show the Shroud was created, around 1260 to 1390 A.D.”