Two new 14 C reference materials have been developed for international use, filling a gap in the present C1–C6 series available from the IAEA. By mixing a modern and a synthetic substance, 150 kg of C7 ( ca . 50 pMC activity) and C8 ( ca . 15 pMC activity), respectively, were obtained.
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Clercq et al. (1997) studied this question.
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