That's only one of many assumptions made that are only approximations.davedan wrote: ↑September 12th, 2017, 6:45 pm C14 is created all the time by neutrinos from the sun. The rate of neutrinos from the sun varies.
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Wikipedia wrote: ...Radiocarbon dating is generally limited to dating samples no more than 50,000 years old, as samples older than that have insufficient 14C to be measurable. Older dates have been obtained by using special sample preparation techniques, large samples, and very long measurement times. These techniques can allow measurement of dates up to 60,000 and in some cases up to 75,000 years before the present.
Radiocarbon dates are generally presented with a range of one standard deviation (usually represented by the Greek letter sigma as 1σ) on either side of the mean. However, a date range of 1σ represents only 68% confidence level, so the true age of the object being measured may lie outside the range of dates quoted.