Abstract
A new approach to isotope identification and radioassay by means of time interval analysis is described. The technique can be employed in sample counting where the isotope of interest has a state (ground or excited) of half-life 10 ns ⩽t 1 2 ⩽ 1 ms populated during the decay sequence. Since this method is biased in favour of time correlated events the background is reduced by orders of magnitude and the lower limit of detection is of the order of 100 pCi. Isotope identification is rapid and unambigous. The method is also ideally suited to routine analysis and automation as in conventional liquid scintillation counting systems. Discussion of the operation of the system with examples is given.
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