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(140 g)*(0.0117%)/(39.0983 g/mol)*(Avogadro's constant)/(1.277e9 years/ln(2)) in Becquerel
(140 g)*(0.0117%)/(39.0983 g/mol)*(Avogadro's constant)/(1.277e9 years/ln(2)) in Becquerel
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