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Here we report a new class of chiral copper(I) halide scintillators, including enantiopure R\u2011\/S\u20113\u2011MLCuI (3\u2010ML represents 3\u2010methylmorpholine) circularly polarized scintillators and racemic Rac\u20113\u2011MLCuI scintillators. Strategic enantiomer selection enables precise control over crystal symmetry\u2014chiral P4\n                    <jats:sub>2<\/jats:sub>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    2 vs. centrosymmetric C2\/c\u2014dictating chiroptical activity. Combining TD\u2010DFT, in situ XAS, and ultrafast spectroscopy, we elucidate that emission originates from cluster\u2010centered self\u2010trapped excitons confined within discrete [Cu\n                    <jats:sub>4<\/jats:sub>\n                    I\n                    <jats:sub>4<\/jats:sub>\n                    ] cores, where pronounced excited\u2010state Cu\u2500Cu contraction and Cu\u2500I elongation induce strong exciton\u2010phonon coupling. Homochiral ligand environments impart persistent chiral imprinting, yielding |g\n                    <jats:sub>lum<\/jats:sub>\n                    | values up to 1.0 \u00d7 10\n                    <jats:sup>\u22122<\/jats:sup>\n                    . The materials exhibit record light yields (58\u00a0000 photons\u2022MeV\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), exceptional x\u2010ray stability (&gt;99% retention after 115 Gy), and ultra\u2010low detection limits (78.9 n Gy\n                    <jats:sub>air<\/jats:sub>\n                    \u2022s\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). A flexible S\u20103\u2010MLCuI@TPU film incorporating polarization\u2010gated imaging achieves 21.2 lp\/mm resolution\u2014significantly surpassing conventional scintillators by suppressing optical crosstalk. High\u2011fidelity x\u2011ray imaging of complex biological and electronic structures is demonstrated. This work provides a structure\u2013property relationship that enables circularly polarized scintillation in chiral copper\u2013iodide clusters, offering insights for further development of related systems.\n                  <\/jats:p>","DOI":"10.1002\/adma.73604","type":"journal-article","created":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T07:33:42Z","timestamp":1780558422000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Photoinduced Structural Relaxation in Chiral Copper(l) Iodide Cluster Scintillators for Circularly Polarized Radioluminescence Imaging"],"prefix":"10.1002","volume":"38","author":[{"given":"Pengyu","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials Low\u2010Carbon Recycling Institute of Matter Science Beijing Key Laboratory of Microstructure and Properties of Solids College of Physics and Optoelectronics Engineering Beijing University of Technology  Beijing P. 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