This article presents a novel strategy for developing high-performance metal-free organic X-ray scintillators (OXSTs) using halogenated open-shell organic radicals. The study demonstrates that these radicals exhibit strong X-ray absorption, efficient exciton utilization, and short luminescence lifetimes, making them promising candidates for X-ray imaging applications. The synthesized organic radicals, such as TTM-1Cz and TTM-1CzBr, show enhanced X-ray absorption due to the presence of halogen atoms, and their photophysical properties, including high photoluminescence quantum yield and fast decay times, make them suitable for X-ray scintillation. The study also highlights the potential of these radicals in medical imaging, particularly in high-resolution micro-computer tomography for visualizing fibrous veins in a bamboo stick. The research provides insights into the development of advanced organic radical scintillators for high-quality X-ray radiography. The study addresses the limitations of traditional inorganic scintillators, such as harsh fabrication conditions, high costs, and sensitivity to environmental factors. The developed organic radicals offer a promising alternative with advantages such as abundant sources, ease of processing, and high mechanical flexibility. The results show that these radicals can achieve 100% exciton utilization efficiency through spin-allowed doublet transitions, leading to superior X-ray scintillation performance. The study also demonstrates the practical applications of these radicals in X-ray imaging, including high-resolution imaging and photostability under X-ray exposure. The findings suggest that organic radicals could be a viable solution for future X-ray scintillation technologies.This article presents a novel strategy for developing high-performance metal-free organic X-ray scintillators (OXSTs) using halogenated open-shell organic radicals. The study demonstrates that these radicals exhibit strong X-ray absorption, efficient exciton utilization, and short luminescence lifetimes, making them promising candidates for X-ray imaging applications. The synthesized organic radicals, such as TTM-1Cz and TTM-1CzBr, show enhanced X-ray absorption due to the presence of halogen atoms, and their photophysical properties, including high photoluminescence quantum yield and fast decay times, make them suitable for X-ray scintillation. The study also highlights the potential of these radicals in medical imaging, particularly in high-resolution micro-computer tomography for visualizing fibrous veins in a bamboo stick. The research provides insights into the development of advanced organic radical scintillators for high-quality X-ray radiography. The study addresses the limitations of traditional inorganic scintillators, such as harsh fabrication conditions, high costs, and sensitivity to environmental factors. The developed organic radicals offer a promising alternative with advantages such as abundant sources, ease of processing, and high mechanical flexibility. The results show that these radicals can achieve 100% exciton utilization efficiency through spin-allowed doublet transitions, leading to superior X-ray scintillation performance. The study also demonstrates the practical applications of these radicals in X-ray imaging, including high-resolution imaging and photostability under X-ray exposure. The findings suggest that organic radicals could be a viable solution for future X-ray scintillation technologies.