Neutron activation cross sections have been measured at 195 kev (50 kev energy spread) for about 30 isotopes, by absolute gamma counting. Absolute calibration was effected by determining the RdTh-D₂O neutron source strength with a flat response 4π graphite sphere neutron counter, and irradiating indium in the form of a thin, uniform, spherical shell. The results are in general agreement with those of other investigators. The 25-kev activation cross sections of Pr¹⁴¹, Zr⁹⁴, Ga⁷¹, and Pd¹⁰⁸ have been revised.
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Lyon et al. (1959) studied this question.
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