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44 kev., corresponding to the L and K x-rays of terbium.Positron emission, if any, was less than one per thousand disintegrations.It is concluded that the only long-lived product of neutron capture by dysprosium is I59Dy.Ketelle (1949) has independently found that neutron irradiation of dysprosium gives a 140-day activity, which is evidently this isotope.The author thanks Mr.
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W. M. Vaidya (1951) studied this question.
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