Tb 3+ ‐Doped Glass‐Ceramic Scintillating Plates and Fibers for X‐Ray Imaging and Flexible Detection

ABSTRACT The development of flexible and wearable radiation detection technology is urgently needed for medical imaging, non‐destructive testing, and personal dosimetry. Although bulk single‐crystal and ceramic scintillators suffer from intrinsic brittleness and scalability issues, glass scintillators typically show limited light yield. To overcome these challenges, we have developed a Tb 3+ ‐doped oxyfluoride glass‐ceramic scintillator via an integrated approach combining phase‐diagram guidance and molecular dynamics simulations. Based on the controlled precipitation of Ba 2 GdF 7 nanocrystals, the as‐prepared glass‐ceramic scintillator achieves a light yield of 41 800 photons/MeV (418% of BGO). It also achieves a high X‐ray imaging spatial resolution of 25.3 lp/mm with large‐area scintillating plates and demonstrates exceptional thermal quenching resistance. Leveraging the superior processability of the glass matrix, we further fabricated a flexible scintillation fiber for remote, highly sensitive radiation dosimetry. The fiber sensor exhibits a sensitivity of 224 nGy/s, stability over 240 on‐off irradiation cycles, and excellent linearity (R 2 = 0.9999). This work not only presents a robust glass‐ceramic scintillator material design strategy but also demonstrates its potential in next‐generation distributed radiation detection systems using large‐area scintillating plates and flexible glass fibers.