Organic　thermally　activated　delayed　fluorescent　(TADF)　scintillators　hold　promising　potential　for　applications　in　medical　radiography　and　security　detection,　but　the　poor　X-ray　absorption　ability　and　inferior　radioluminescence　(RL)　hampered　their　progression.　Herein,　the　study　has　pioneered　the　development　of　high-performance　TADF　Ag(I)-based　scintillators　from　M2X2(dppb)2　(M　=　Ag,　Cu;　X　=　Cl,　Br,　I)　complexes　with　1,2-Bis(diphenylphosphino)benzene　(dppb)　ligand.　In　comparison　with　Cu(I)　complexes,　the　Ag(I)　series　generally　exhibited　superior　scintillation　performance.　Notably,　Ag2Cl2(dppb)2　(Ag1)　stands　out　with　exceptionally　high　RL　intensity　(approximate　to　125%　higher　than　that　of　CsI:Tl)　and　a　low　detection　limit　of　59.8　nGy　s-1.　The　outstanding　scintillation　performance　of　Ag1　is　primarily　attributed　to　the　synergistic　effect　of　the　high　exciton　utilization　efficiency　origin　from　a　small　singlet-triplet　energy　gap,　enhanced　X-ray　absorption　capacity　by　heavy　atoms,　and　the　high　photoluminescence　quantum　yield　(76.47%　in　ambient　atmosphere).　By　fabricating　a　flexible　film　constructed　with　Ag1　submicron　crystalline　powders,　a　high　spatial　resolution　of　25.0　lp　mm-1　for　X-ray　imaging　is　obtained.　It　offers　new　opportunities　for　utilizing　TADF　metal-organic　complexes　for　highly　efficient　X-ray　scintillation　and　imaging.　Scintillators　with　good　radioluminescence　performance　are　prepared　by　combining　the　TADF　mechanism　to　optimize　the　utilization　of　triplet　excitons,　coupled　with　increased　X-ray　absorption　through　heavy　atoms,　verifying　the　advantages　of　Ag(I)-halide　complexes　on　radioluminescence.　Besides,　the　influence　of　halogens　on　photoluminescence　and　radioluminescence　are　investigated.　As　a　practical　application,　Ag2Cl2(dppb)2　is　applied　to　fabricate　flexible　scintillator　films,　achieving　high-resolution　imaging　of　25　lp　mm-1.　image