Answers are grounded in this paper and cite their sources.
The neutron activation cross sections near 25 kev have been measured for about 50 nuclei. Gamma-ray scintillation spectrometers with known efficiency were used to compare the radioactivities produced by the several nuclei with I¹²⁸. This gave a significant increase in sensitivity and precision over direct beta-counting methods in many cases. Absolute standardization was obtained through scintillation-beta-counting the I¹²⁸ in NaI(Tl) crystals irradiated with a neutron source calibrated by the manganese bath technique.
No takes yet. Share an insight, caveat, or question.
Macklin et al. (1957) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: