The transmission (Cauchois) type curved crystal spectrograph has been found to be a practical instrument for photographing characteristic x-rays associated with radioactive decay. A photograph of x-rays associated with the decay of 6.7-hour Cd107,109 is shown. X-rays emitted during the decay of 2.7-day In¹¹² and 12.8-hour Cu⁶⁴ have also been identified.
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Edwards et al. (1945) studied this question.
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