doi:10.1016/j.nima.2024.170075engApilluelo, J.Asquith, L.Bannister, E.F.Beney, J.L.de La Bernardie, X.Bezerra, T.J.C.Bongrand, M.Bourgeois, C.Boutalha, H.Breton, D.Briere, M.Cabrera, A.Cadiou, A.Calvo, E.Chaumat, V.Chauveau, E.Cattermole, B.J.Chen, M.Chimenti, P.Cornet, T.Cowen, D.F.Delafosse, C.Dusini, S.Earle, A.Frigerio-Martins, C.Galán, J.Gallas, A.García, J.A.Gazzini, R.Gibson-Foster, A.Girard-Carillo, C.Griffith, W.C.Gómez-Cadenas, J.J.Guittière, M.Haddad, F.Hartnell, J.Holin, A.Hull, G.Irastorza, I.G.Jovanovic, I.Koch, L.Du, J.F. LeLefebvre, C.Lefevre, F.Legrand, F.Loaiza, P.Lock, J.A.Luzón, G.Maalmi, J.Malhado, J.P.Mantovani, F.Marquet, C.Martínez, M.Mathon, B.Navas-Nicolás, D.Nunokawa, H.Ochoa-Ricoux, J.P.Palomares, C.Petyt, D.Pillot, P.Porter, J.C.C.Pravikoff, M.S.Ramarijaona, H.Roche, M.Rosero, R.Rosier, P.Roskovec, B.Sarsa, M.L.Schoppmann, S.Serafini, A.Shepherd-Themistocleous, C.Shorrock, W.Simard, L.Soleti, S.R.Steiger, H.Th.J.Stocco, D.Strati, V.Stutzmann, J.S.Suekane, F.Tunc, A.Tuccori, N.Verdugo, A.Viaud, B.Wakely, S.M.Weber, A.Wendel, G.Wilhelm, A.S.Yeh, M.Yermia, F.Characterization of a radiation detector based on opaque water-based liquid scintillatorART-2024-140907We present the characterization of a novel radiation detector based on an opaque water-based liquid scintillator. Opaque scintillators, also known as LiquidO, are made to be highly scattering, such that the scintillation light is effectively confined, and read out through wavelength-shifting fibers. The 1-liter, 32-channel prototype demonstrates the capability for both spectroscopy and topological reconstruction of point-like events. The design, construction, and evaluation of the detector are described, including modeling of the scintillation liquid optical properties and the detector’s response to gamma rays of several energies. A mean position reconstruction error of 4.4 mm for 1.6 MeV-equivalent events and 7.4 mm for 0.8 MeV-equivalent events is demonstrated using a simple reconstruction approach analogous to center-of-mass.2024http://zaguan.unizar.es/record/14714110.1016/j.nima.2024.170075http://zaguan.unizar.es/record/147141oai:zaguan.unizar.es:147141Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1071 [14 pp.] (2024), 170075by-nc-ndhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.esinfo:eu-repo/semantics/openAccess