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activating charged particles. Furthermore, as far as charged particle activation analysis is concerned, our experimental data indicate that the detection limit for oxygen in silicon using the lsO(a, pn)18F reaction can be increased by a factor of 10. This would result in the possibility of nondestructive analyses with a practical detection limit of 5-10 ppb by weight. ACKNOWLEDGMENTThanks are due to R. E. Wainerdi for valuable suggestions and for making available the facilities of the Activation Analysis Research Laboratory. We are especially indebted to . P. Yule for helping in the adaptation and use of the decay curve analysis program.

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