@article{osullivan_electron-gamma_2025, title = {Electron-gamma decay spectroscopy of$^{\textrm{152}}$ Tb}, volume = {100}, issn = {0031-8949, 1402-4896}, url = {https://iopscience.iop.org/article/10.1088/1402-4896/add812}, doi = {10.1088/1402-4896/add812}, abstract = {Abstract Terbium-152, decaying by electron capture and β + emission to 152 Gd with Q {EC} = 3990(40) {keV} and T 1/2 = 17.8784(95) h, shows promise in nuclear medicine. First-in-human trials have demonstrated its suitability for positron emission tomography ({PET}) imaging, with potential applications in personalised cancer treatments through its membership of the terbium theragnostic quartet. A source of 152 Tb was produced at {CERN}-{ISOLDE}, using spallation of a tantalum target induced by a 1.4 {GeV} proton beam and mass separation with the {ISOL} method. The source was then shipped to {ILL} Grenoble for measurement. This paper details the electron-gamma spectroscopy of the decay using the {PN}1/{LOHENGRIN} setup, supporting the gamma-gamma spectroscopy of 152 Tb sources produced in the same {ISOLDE} run. Preliminary measurements of the relative intensity of internal conversion electrons are presented, validating theoretical predictions of internal conversion coefficients for several transitions and confirming their assigned multipolarity. The final analysis will support the gamma-gamma spectroscopy in establishing a revised level scheme for the decay, leading to an updated beta strength function and a corresponding change in dosimetry calculations.}, pages = {065308}, number = {6}, journaltitle = {Physica Scripta}, shortjournal = {Phys. Scr.}, author = {O’Sullivan, E B and Collins, S M and Daugas, J-M and Domenichetti, L and Heery, J and Henderson, J and Köster, U and Michelagnoli, C and Parry, T and Pascu, S and Regan, P H and Shearman, R}, urldate = {2025-06-10}, date = {2025-06-01}, keywords = {scientific-publication}, }