Question #d1711

1 Answer
Andrea B.
Nov 30, 2017

#C^14#

Explanation:

#K^40# (not 4) has an half life of #1,25 xx 10^9# years. U 235 is not a radioisotope, #U^238# has an half life of #4,47 xx 10^9# years and both of them would be too slow and not accurate for datation about 20,000 years.
#C^14# has an half life of 5600 years and moreover C is the only element that is conteined in a skeleton. So you can use only C

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