X- and γγ-ray emissions observed in the decay of 237Np and 233Pa

Solvent extraction was used to prepare pure solutions of 237Np and 233Pa. Portions were used for liquid scintillation counting (disintegration rates) and γγ-ray spectroscopy with HPGe detectors. X- and γγ-ray intensities observed in the 237Np decay were verified, with a new result of 15.08±0.04%15.08±0.04% for the 29 keV γγ-ray (5σ5σ higher than previous reports). K X- and γγ-ray intensities observed in the 233Pa decay were verified with new results for the L X-ray intensities (∼55%∼55% total L intensity), approximately twice previously reported total intensity.