results were obtained from Dr. S. Cohn by phone on April 2h, 1956. A follow-up letter fromDr. Cohn6) expressed his idea that the discrepancy in the beta count probably lies inthe conversion from c/m to.d/m. NADL used S790 — ¥90 as a stenderd in this case and for purposes of comparison, the HASL results were also standardised against Sr90 - ¥90, It is felt that the use of KHO as a stenderd allows the best approximation of the energy for mixed fission products among the available Long-lived isotopes(7), As an aid in evaluating these data, Figure 1 and Table 8 are included. 5002061

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