Carbon dating questions datingfactory com
So by measuring the C-14 level we work out how many half lives old the sample is and therefore how old it is.
The trouble is that after 40,000 years there is under 1% of the original C-14 left, and it becomes too hard to measure it accurately.
We will deal with carbon dating first and then with the other dating methods.
Carbon has unique properties that are essential for life on Earth.
This guy seriously questions the veracity of radiocarbon dating, and the fossil record.
Now regardless of his bias towards creationism and the bible, the honest scientific criticism and limitations of these widely-used dating techniques do not seem to make as much news as their results.
“I cut a little piece off and it burned,” she said.
Over the years, Winn showed her find to others, including local historian and author Janet Klein.
“I sort of wandered and was beachcombing and found it in the rocks,” said Winn of spotting the object that was about 20 inches long, seven inches in diameter.
When a piece fell off Winn’s object, she decided to have it radiocarbon dated and see where it fit on that timeline.
The answer: It is a woolly mammoth tusk, but its age puts it outside the peninsula’s ice-free slice of time.
The half life of carbon-14 is about 5,700 years, so if we measure the proportion of C-14 in a sample and discover it's half a part per trillion, i.e.
half the original level, we know the sample is around one half life or 5,700 years old.
So if there's fossil carbon involved, which has sat around in the oceans or in rocks for many half-lives, that's going to give spuriously long dates.* The rate of production in the atmosphere has varied slightly with solar cycles.* The rate of production in the atmosphere has varied substantially in the last seventy years due to nuclear testing.* Back in the bad old days when you had to detect the C14 by waiting for some of it to decay and detecting the radiation, you had to get large sample sizes to get good statistics because only a tiny fraction of it would decay in a reasonable time.