Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev txhim kho ntawm kev kho mob thev naus laus zis, txoj hauv kev ntawm cov neeg raug mob X-rays thaum lawv mus rau hauv tsev kho mob kuj tau nce ntau.Txhua tus paub tias lub hauv siab X-rays, CT, xim ultrasound thiab X-ray tshuab tuaj yeem tso X-rays kom nkag mus rau tib neeg lub cev los soj ntsuam tus kab mob.Lawv kuj paub tias X-rays tawm hluav taws xob, tab sis muaj pes tsawg tus neeg nkag siab txog cov tshuab X-ray.Yuav ua li cas yog lub emission rays?
Ua ntej, X-rays nyob rau hauv ib qho zoo li casX-ray tshuabtsim?Cov xwm txheej xav tau rau kev tsim cov X-rays siv hauv cov tshuaj muaj raws li hauv qab no: 1. X-ray raj: lub tshuab nqus tsev iav raj muaj ob lub electrodes, cathode thiab anode;2. Tungsten phaj: hlau tungsten nrog tus lej atomic siab tuaj yeem siv los ua X-ray raj Lub anode yog lub hom phiaj rau kev txais hluav taws xob foob pob hluav taws xob;3. Cov hluav taws xob txav ntawm kev kub ceev: siv cov hluav taws xob siab ntawm ob qho kawg ntawm X-ray raj kom cov electrons txav ntawm qhov kub ceev.Tshwj xeeb transformers nce qib nyob voltage mus rau qhov yuav tsum tau high voltage.Tom qab lub phaj tungsten raug ntaus los ntawm electrons txav ntawm kev kub ceev, cov atoms ntawm tungsten tuaj yeem ionized rau hauv electrons los ua X-rays.
Qhov thib ob, qhov xwm txheej ntawm X-ray no yog dab tsi, thiab vim li cas thiaj siv tau los soj ntsuam tus mob tom qab nkag mus rau tib neeg lub cev?Qhov no yog tag nrho vim yog cov khoom ntawm X-rays, uas muaj peb lub zog loj:
1. Kev nkag mus: Kev nkag mus yog hais txog lub peev xwm ntawm X-ray kom dhau los ntawm ib yam khoom uas tsis tau nqus.X-rays tuaj yeem nkag mus rau cov ntaub ntawv uas pom lub teeb pom kev zoo tsis tuaj yeem.Lub teeb pom kev muaj qhov ntev wavelength, thiab photons muaj zog tsawg heev.Thaum nws tsoo ib yam khoom, ib feem ntawm nws yog reflected, feem ntau ntawm nws yog absorbed los ntawm cov khoom, thiab tsis tuaj yeem dhau los ntawm cov khoom;Thaum X-rays tsis yog, vim hais tias ntawm lawv luv wavelength, lub zog Thaum nws ci rau ntawm cov khoom, tsuas yog ib feem yog absorbed los ntawm cov khoom, thiab feem ntau nws kis tau los ntawm lub atomic sib txawv, uas qhia ib tug muaj zog nkag tau mus rau lub peev xwm.Lub peev xwm ntawm X-rays nkag mus rau qhov teeb meem yog cuam tshuam nrog lub zog ntawm X-ray photons.Qhov luv luv lub wavelength ntawm X-rays, lub zog ntawm photons ntau dua thiab muaj zog dua lub zog nkag.Lub zog nkag mus ntawm X-rays kuj muaj feem xyuam rau qhov ntom ntawm cov khoom.Cov khoom siv denser absorbs ntau X-rays thiab kis tsawg dua;cov khoom denser absorbs tsawg dua thiab kis ntau dua.Siv cov cuab yeej no ntawm kev nqus sib txawv, cov nqaij mos xws li cov pob txha, cov leeg, thiab cov rog uas muaj qhov sib txawv tuaj yeem paub qhov txawv.Qhov no yog lub hauv paus ntawm lub cev ntawm X-ray fluoroscopy thiab yees duab.
2. Ionization: Thaum ib yam khoom raug irradiated los ntawm X-rays, lub extranuclear electrons raug tshem tawm ntawm lub atomic orbit.Cov nyhuv no hu ua ionization.Hauv cov txheej txheem ntawm cov nyhuv photoelectric thiab tawg, cov txheej txheem uas photoelectrons thiab recoil electrons raug cais tawm ntawm lawv cov atoms hu ua thawj ionization.Cov photoelectrons lossis recoil electrons sib tsoo nrog lwm cov atoms thaum mus ncig, kom cov electrons los ntawm cov atoms raug hu ua Secondary ionization.nyob rau hauv cov kua thiab kua.Cov ionized zoo thiab tsis zoo ions yuav recombine sai thiab tsis yooj yim rau sau.Txawm li cas los xij, tus nqi ionized hauv cov roj yog ib qho yooj yim los sau, thiab cov nqi ntawm ionized tuaj yeem siv los txiav txim siab txog qhov pom ntawm X-ray: X-ray ntsuas ntsuas tau ua raws li txoj cai no.Vim yog ionization, gases tuaj yeem ua hluav taws xob;Qee yam khoom tuaj yeem raug tshuaj lom neeg;ntau yam teebmeem lom neeg tuaj yeem ua rau muaj kab mob.Ionization yog lub hauv paus ntawm X-ray puas thiab kho.
3. Fluorescence: Vim lub luv wavelength ntawm X-rays, nws yog pom tsis tau.Txawm li cas los xij, thaum nws yog irradiated rau qee cov tebchaw xws li phosphorus, platinum cyanide, zinc cadmium sulfide, calcium tungstate, thiab lwm yam, cov atoms nyob rau hauv ib qho kev zoo siab vim ionization los yog excitation, thiab cov atoms rov qab mus rau hauv av hauv cov txheej txheem. , vim lub zog hloov pauv ntawm valence electrons.Nws emits pom los yog ultraviolet lub teeb, uas yog fluorescence.Cov nyhuv ntawm X-rays ua rau cov tshuaj fluoresce hu ua fluorescence.Qhov kev siv ntawm fluorescence yog proportional rau tus nqi ntawm X-rays.Cov nyhuv no yog lub hauv paus rau kev siv X-rays rau fluoroscopy.Hauv kev kuaj X-ray ua haujlwm, hom fluorescence no tuaj yeem siv los ua fluorescent screen, intensifying screen, input screen hauv duab intensifier thiab lwm yam.Lub vijtsam fluorescent yog siv los saib xyuas cov duab ntawm X-rays dhau los ntawm tib neeg cov ntaub so ntswg thaum lub sij hawm fluoroscopy, thiab cov tshuaj tiv thaiv hnyav yog siv los txhim kho qhov rhiab heev ntawm zaj duab xis thaum thaij duab.Cov saum toj no yog cov lus qhia dav dav rau X-rays.
Peb Weifang NEWHEEK Electronic Technology Co., Ltd. yog cov chaw tsim khoom tshwj xeeb hauv kev tsim khoom thiab muag khoom ntawmX-ray tshuab.Yog tias koj muaj lus nug txog cov khoom no, koj tuaj yeem tiv tauj peb.Tel: +8617616362243!
Post lub sij hawm: Aug-04-2022