Radiographic flaw detection yog ib txoj hauv kev uas siv cov penetrability thiab linearity ntawm rays los xyuas qhov flaws. Txawm hais tias cov rays no tsis tuaj yeem pom ncaj qha los ntawm qhov muag liab qab zoo li pom lub teeb, lawv tuaj yeem ua rau cov duab thaij duab thiab tuaj yeem tau txais los ntawm cov neeg txais tshwj xeeb.
Cov kab hluav taws xob feem ntau siv rau kev kuaj pom qhov tsis zoo suav nrog x-rays thiab gamma rays tawm los ntawm isotopes, uas yog hu ua x-ray flaw detection thiab gamma ray flaw detection feem. Thaum cov rays dhau los ntawm (irradiate) ib yam khoom, qhov ntau dua qhov ntom ntawm cov khoom, qhov ntau qhov kev siv ntawm cov rays yog attenuated, uas yog, qhov qis dua cov rays tuaj yeem nkag mus los ntawm cov khoom. Lub sijhawm no, yog siv cov duab thaij duab kom tau txais lub teeb liab, lub teeb rhiab heev ntawm zaj duab xis yuav me me; yog tias ib qho cuab yeej siv los txais lub teeb liab, lub teeb liab tau txais yuav tsis muaj zog.
Yog li ntawd, thaum irradiating qhov chaw yuav tsum tau soj ntsuam nrog rays, yog hais tias muaj tsis xws luag xws li pores thiab slag inclusions nyob rau hauv, qhov ceev ntawm cov khoom uas dhau los ntawm lub rays dhau los ntawm txoj kev puas yog ntau me dua li ntawm txoj kev uas tsis muaj defects, thiab nws qhov kev siv zog yuav tsawg dua nws tsis muaj zog, uas yog, qhov kev sib kis tau ntau dua. Yog hais tias ib zaj duab xis tau txais nws, lub teeb rhiab heev yuav ntau dua, thiab lub dav hlau projection ntawm qhov tsis xws luag perpendicular mus rau cov kev taw qhia ntawm lub rays yuav tsum reflected nyob rau hauv zaj duab xis; tib yam tuaj yeem ua tau yog tias siv lwm cov receivers. Cov cuab yeej siv los cuam tshuam lub dav hlau qhov projection ntawm qhov tsis xws luag perpendicular mus rau txoj kab hluav taws xob thiab tus nqi hluav taws xob xa mus.
Nws tuaj yeem pom tau tias nyob rau hauv ib txwm muaj, nws tsis yooj yim los nrhiav cov kab nrib pleb los ntawm kev tshuaj xyuas hluav taws xob, lossis hauv lwm lo lus, kev tshuaj xyuas hluav taws xob tsis zoo rau cov kab nrib pleb.
