Discussed herein is the application of a statistical correlation method [Goldanski and Podgoretski, Doklady Akad. Nauk. S.S.S.R. 100, 237 (1955)] to the determination of the lifetime of an activity in equilibrium with a long‐lived parent activity. It is shown that this method has a definite advantage over delayed‐coincidence methods when the lifetime to be measured is of the order of 10−4 sec or longer. An electronic apparatus designed to perform the operations required by the statistical correlation method is described. This equipment has been used for a new determination, 0.293±0.020×10−3 sec, for the half‐life of Y88m.
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An analysis for other cases, such as one which involves counting Channel 1 pulses during a gate time triggered by pulses in Channel 2, gives results very similar to the case chosen for the discussion.
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An electronic device that performs the operations for Case II of the correlation method differs from the above description only in that one channel, say channel A, requires several counts per interval binaries. Only the last set of these binaries is directly coupled with the product gates. The function of the other sets is to store counts for the desired number of intervals by which channel A is to be delayed. The function of the clear signal is to simultaneously transfer the counts on one set to the next closer to the product gates, and to clear only the first set, which is the only one directly fed by pulses from gate A. During the interval when gate A is open, each of the other sets of binaries is in a stationary state corresponding to the number of counts that appeared in the appropriate preceding intervals. When the interval is over and the multiplication process takes place the product transferred to the product scaler is if j is the number of additional counts per interval binaries. The additional equipment required for the operations has not yet been designed, hence the experiments described in Sec. IV apply to Cases I of the correlation methods.
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© 1956 American Institute of Physics.
1956
American Institute of Physics
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