Video: Puas yog protons siab LET?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Vim protons tsis muaj ntau siab dua hloov hluav taws xob tawm ( LET ) dua li photons, qhov txheeb ze biologic efficiency yog kwv yees li 1.1. Yog li ntawd, cov teebmeem ntawm qog thiab cov ntaub so ntswg ib txwm xav tias muaj feem xyuam rau cov koob tshuaj thiab kev faib ua feem ntau tib yam li kev kho mob photon.
Hauv qhov no, LET siab yog dab tsi?
Hauv dosimetry, hloov hluav taws xob tawm ( LET ) yog tus nqi ntawm lub zog uas cov ionizing particle hloov pauv mus rau cov khoom hla ib chav nyob nrug deb. A siab LET yuav attenuate cov hluav taws xob sai dua, feem ntau ua shielding zoo dua thiab tiv thaiv kev nkag mus tob.
Qhov thib ob, LET hluav taws xob tsawg yog dab tsi? Hluav taws xob tau muab cais ua ib qho kev hloov pauv hluav taws xob siab (siab LET ) los yog qis linear zog hloov ( low LOJ ), raws li tus nqi ntawm lub zog nws hloov mus rau ib chav tsev txoj kev ntev nws mus. Alpha hluav taws xob yog siab LET ; beta thiab gamma hluav taws xob yog low LOJ.
Khaws qhov no saib, dab tsi cia hauv xray?
Lub ntsiab lus yog qhov ntawd LET yog ib qho kev ntsuas ntawm kev saib xyuas quab yuam ua rau them nqi ionizing particle taug kev los ntawm qhov teeb meem. Thiab lub zog hloov pauv, lub ntsiab lus ntau npaum li cas ntawm cov hluav taws xob lub zog tau hloov mus rau hauv cov khoom nws tau dhau los. Lub tswv yim no cuam tshuam nrog X - duab tshav piv rau lwm hom hluav taws xob.
Dab tsi yog txhais los ntawm lub sij hawm txheeb ze lom neeg cov nyhuv?
Cov txheeb ze bio ua tau zoo (RBE) yog txhais raws li qhov sib piv ntawm cov koob tshuaj xav tau los ntawm ob lub tshuab hluav taws xob ua rau tib qib ntawm nyhuv . Yog li, RBE nyob ntawm qhov koob tshuaj thiab qhov kawg ntawm qhov laj thawj. Qhov loj ntawm RBE qhov tseem ceeb thiab lawv qhov kev hloov pauv yog qhov loj dua rau kev kho Car-bon ion.
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