The specific activity of 14C in the biosphere is 0.255 Bq per gram, and the half-life of 14C is 5730 years. What is the age of a piece of Egyptian papyrus that shows a 14C specific activity of 0.156 Bq?
(a) 2820 years
(b) 3510 years
(c) 4060 years
(d) 5730 years
(e) 5860 years
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