Inspections
based on ionizing radiation have spread into various
areas including our daily lives, industries, and scientific investigations
and now face increasing demands with the development of society. Commercial
X-ray detectors are mostly based on an indirect operation model in
which the scintillator transforms X-ray photons into visible light
and bottom photodiodes convert them into images. Obviously, the performance
of the scintillator determines the final imaging properties, and the
pursuit of scintillators with superior properties and lower cost is
ongoing. Recently, inorganic lead halide perovskite nanocrystals (PNCs)
emerged as promising scintillators for X-ray imaging. Here, we make
a detailed conclusion of the superiority of PNC scintillators and
take a new look at their scintillation performances. Discrepancies
are discussed and some suggestions are proposed. Finally, perspectives
on future developments, advice to the field, and proposed solutions
to the problems toward full device performance and practical applications
are provided.