High Spatial Resolution Perovskite Fast Neutron Imaging Screen by Cl (n, p) Nuclear Reaction.

Fast neutron imaging has emerged as a highly adaptable non-destructive inspection tool in industrial applications and scientific research. This technique predominantly employs hydrogen-rich scintillation screens based on the principle of nuclear recoil; however, it suffers from limited spatial resolution due to significant energy diffusion of recoil protons. Herein, a 1D perovskite, CsCuClI is demonstrated, for fast neutron imaging based on Cl (n,p) nuclear reaction. This scintillator features a large area (25 cm), an excellent light yield (31 597 photons/MeV), and high spatial resolution (1.31 lp mm). The reduced energy diffusion of secondary charged particles, resulting from the distinct detection principle of nuclear reaction, contributes to the high spatial resolution. Imaging of a Teflon mold successfully demonstrates its potential for low-Z material radiography. Combined with outstanding stability and low afterglow, CsCuClI represents a new class of high-performance perovskite fast neutron imaging screen based on nuclear reaction principles. This advancement is anticipated to significantly advance industrial non-destructive testing and nuclear medicine imaging.