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C-14 abundance




NCRP Report No. 81 (1985), Table 2.1 (pg. 4) gives a natural abundance
value for C-14 of 10^-10 %.  There is a footnote:  "This value is based on
the atmospheric concentration of C-14 of 6 pCi/g.  Carbon [a]s fossil
materials, ocean sediments or geologically aged materials contains no
C-14."