The measurements presented below were made during 1970–71 by techniques described in R., 1968, v. 10, p. 246, and 1970, v. 12, p. 87. Errors associated with the de Vries effect and the uncertainty of the half-life are not included. In November 1971 a new low level, quartz-lined 1/2L counter designed by M. Stuiver was put into operation. It has allowed routine measurements with the samples representing 500mg to 1g pure carbon.
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Buckley et al. (1973) studied this question.
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