Abstract
The irradiation of Y89 and Pr141 under a sufficiently high thermal neutron flux produces small amounts of Y91 and Pr143 by secondary neutron capture. A measurement of the second-order activities, although completely unobservable at the end of the irradiation, may be made after the shorter lived first-order activities have disappeared. From relative measurements of the first- and second-order activities induced in Y89 and Pr141 values for the activation cross sections of Y90 and Pr142 have been established. For Pr142 a value of σact = 18±3 barns was found; for Y90 a value of 6.5 barns was established as an effective upper limit.
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