I-Cold cathode X-ray systems inamandla okuguqula ubuchwepheshe beshubhu le-X-ray, ngaleyo ndlela iphazamise imakethe yokucabanga yezokwelapha.Amashubhu e-X-ray ayingxenye ebalulekile yemishini yokuthwebula yezokwelapha, esetshenziselwa ukukhiqiza ama-x ray adingekayo ukuze kwakheke izithombe zokuxilonga.Ubuchwepheshe bamanje buncike kuma-cathode ashisayo, kodwa amasistimu e-cold-cathode amelela uguquko olunamandla kulo mkhakha.
YendabukoX-ray amashubhu sebenza ngokushisisa umcu ezingeni lokushisa eliphezulu, bese ukhipha ama-electron.Lawa ma-electron asheshiselwa lapho kuhloswe khona, ngokuvamile enziwe nge-tungsten, akhiqiza ama-X ray lapho enomthelela.Nokho, le nqubo inemibi eminingana.Amazinga okushisa aphezulu adingekayo ukuze kukhishwe ama-electron akhawulela isikhathi sokuphila samashubhu, njengoba ukushisisa nokupholisa okuqhubekayo kubangela ukucindezeleka okushisayo nokuwohloka.Ukwengeza, inqubo yokushisisa yenza kube nzima ukuvula nokuvala ngokushesha ishubhu le-X ray, okwandisa isikhathi esidingekayo senqubo yokuthwebula izithombe.
Ngokuphambene, amasistimu e-X-ray e-cathode abandayo asebenzisa umthombo we-electron emission field futhi awadingi ukufudumeza.Esikhundleni salokho, lezi zinhlelo zikhiqiza ama-electron ngokusebenzisa inkambu kagesi endaweni ebukhali ye-cathode, okuholela ekukhishweni kwama-electron ngenxa ye-quantum tunneling.Njengoba i-cathode ingashisi, isikhathi sokuphila se-X-ray tube sinwetshwa kakhulu, sinikeze ukonga kwezindleko ezingase zibe khona ezikhungweni zezokwelapha.
Ngaphezu kwalokho, izinhlelo ze-X-ray ezibandayo ze-cathode zinikeza ezinye izinzuzo.Angavulwa futhi avalwe ngokushesha, okuvumela inqubo yokuthwebula esebenza kahle kakhulu.Amashubhu e-X-ray avamile adinga isikhathi sokufudumala ngemva kokuvula, okungase kudle isikhathi ezimeni eziphuthumayo.Ngohlelo olubandayo lwe-cathode, ukuthwebula izithombe kungenzeka ngokushesha, okungase konge isikhathi esibalulekile ezimweni ezibucayi zezokwelapha.
Ukwengeza, njengoba kungekho filament eshisayo, asikho isimiso sokupholisa esidingekayo, okunciphisa inkimbinkimbi nobukhulu bemishini ye-X-ray.Lokhu kungase kuholele ekuthuthukisweni kwemishini yokuthwebula ephathekayo ephathekayo nehlangene, okwenza ukuthwebula isithombe sezokwelapha kube lula futhi kube lula kuzilungiselelo ezahlukahlukene, okuhlanganisa izindawo ezikude noma izikhungo zezokwelapha eziphathwayo.
Naphezu kwamandla amakhulu ezinhlelo ze-X-ray ze-cathode ezibandayo, kusenezinselelo ezithile okusamele zixazululwe.Amathiphu e-Field emission cathode antekenteke, alimala kalula, futhi adinga ukuphathwa nokunakekelwa ngokucophelela.Ngaphezu kwalokho, inqubo ye-quantum tunneling ingase ikhiqize ama-electron anamandla aphansi, angabangela umsindo wesithombe futhi anciphise ikhwalithi yonke yezithombe ze-X-ray.Kodwa-ke, ucwaningo oluqhubekayo kanye nentuthuko yezobuchwepheshe ihlose ukunqoba le mikhawulo futhi inikeze izixazululo zokuqaliswa okubanzi kwezinhlelo ze-X-ray ezibandayo ze-cathode.
Imakethe yokucabanga yezokwelapha iyaqhudelana kakhulu futhi ilokhu ivela njalo, ngentuthuko yezobuchwepheshe ethuthukisa ukuxilongwa nokwelashwa.Amasistimu e-X-ray e-cold cathode anamandla okuphazamisa le makethe ngezinzuzo ezibalulekile ngaphezu kobuchwepheshe beshubhu le-X-ray bendabuko.Ukuphila okunwetshiwe, ukushintsha okusheshayo kanye nosayizi oncishisiwe kungashintsha ukucabanga kwezokwelapha, kuthuthukise ukunakekelwa kwesiguli futhi kwandise ukusebenza kahle kwendawo yonke yokunakekelwa kwezempilo.
Sengiphetha, amasistimu e-X-ray e-cathode abandayo amele into entsha ethembisayo engaphazamisa imakethe yokucabanga yezokwelapha.Ngokufaka esikhundleni ubuchwepheshe be-filament obushisayo bendabukoX-ray amashubhu, lezi zinhlelo zinikeza impilo ende, amandla okushintsha ngokushesha, namandla wamadivayisi aphathekayo kakhudlwana.Nakuba izinselele zisazoxazululwa, ucwaningo oluqhubekayo luhlose ukunqoba le mikhawulo futhi lwenze ama-cold cathode X-ray systems abe indinganiso ekucabangeni kwezokwelapha, ukuthuthukisa ukunakekelwa kwesiguli kanye nokuguqula imboni.
Isikhathi sokuthumela: Aug-25-2023