ABSTRACT Glass scintillators have long been considered a cost‐effective alternative to crystal scintillators, but their widespread use has been limited by low absorption, unsatisfactory light yield, and poor X‐ray imaging spatial resolution. Here, we introduce a class of Ce 3+ ‐doped gadolinium fluoro‐oxide borosilicate glasses. The synergistic incorporation of Gd 2 O 3 and GdF 3 establishes a dense matrix ( ρ ≥5.86 g/cm 3 , Z eff ≥41.6), while AlF 3 optimizes the glass network and suppresses nonradiative losses. Under X‐ray, the glass achieves a light yield of 3360 ph/MeV (42% of Bi 4 Ge 3 O 12 ), while maintaining a linear response to dose rates with a detection limit of 513 nGy/s. A 0.50 mm‐thick sample attenuates over 97% of 50.24 keV X‐rays (≥88.8% at 0.3 mm) and ≥99.9% of 22 keV X‐rays (≥99.5% at 0.3 mm). These properties, coupled with outstanding processability, enable the fabrication of scintillators as thin as 300 µm, facilitating ultrathin, high‐absorption X‐ray imaging with spatial resolution reaching ∼23 lp/mm. Owing to high‐density, the glasses also exhibit strong γ‐ray responsiveness across multiple isotopes, including 137 Cs, 22 Na, 133 Ba, 177 Lu, and 228 Th, with a light yield of 1620 ph/MeV at 662 keV. The linear correlation between the ADC channels of full‐energy peaks and photon energy highlights the potential for γ‐ray screening of radioactive elements.
Zheng et al. (Sun,) studied this question.