Abstract
We applied Mössbauer spectroscopy to 237Np in aqueous solutions to study chemical states. A sample solution was adjusted to 50 mg/ml of Np(V) concentration in 0.6 M nitric acid solution. This solution was put into original designed containers for Mössbauer spectroscopy. Mössbauer spectra were measured in the transmission geometry at 11 K using cryostat, after containers with a sample solution was mounted to a sample holder and soaked into liquid nitrogen to freeze quickly. Mössbauer spectrum was observed 16 absorption lines with quadruple splitting and magnetic splitting. The value of isomer shift of Np(V) in 0.6 M nitric acid was -17.4(1) mm/s at 11 K. Isomer shift value reflects valence and coordination number. It was found that Np(V) had 7 coordination numbers in 0.6 M nitric acid solution from values of isomer shift that had been measured for neptunyl compounds.
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