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buy cheap prometrium The latter point is illustrated by nuclear weapons testing, which resulted in atmospheric 14C nearly doubling in the early 1960s. Contextual clues can help to narrow down the date range, as can the dating of other related samples. While the limit of carbon dating is around 50,000 years, it is a powerful technique. "In an ideal situation [post-bomb] you can have precision of a few years, but pre-bomb samples could have age ranges of decades to hundreds, or for samples close to the radiocarbon method limit, even thousands of years," says Bryant.