Video: Dab tsi yog cia hauv xray?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv dosimetry, linear zog hloov ( LET ) yog tus nqi zog uas ib qho ionizing particle hloov mus rau cov khoom traversed ib chav nyob deb. Nws piav txog qhov kev txiav txim ntawm hluav taws xob rau hauv qhov teeb meem. Nws zoo ib yam rau lub zog retarding uas ua rau cov nqi ionizing particle taug kev los ntawm qhov teeb meem.
Hauv qhov no, LET hluav taws xob tsawg yog dab tsi?
Hluav taws xob yog cais raws li qhov siab linear zog hloov (siab LET ) lub qis linear zog hloov ( qis LET ), 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 qis LET.
Hom hluav taws xob twg muaj qhov loj tshaj plaws RBE? Raws li tau hais los saum toj no, RBE nyob ntawm seb muaj pes tsawg leeg raug txiav txim siab. Los ntawm qhov no nws yog qhov tseeb tias RBE rau 250 keV X-ray tsuas yog me ntsis siab dua li rau cobalt-60. gamma hluav taws xob (uas yuav zoo ib yam li caesium-137 gamma hluav taws xob ).
Ib yam li ntawd, dab tsi yog qhov tseem ceeb ntawm kev hloov hluav taws xob linear?
Radiobiology > Lub cev txheej txheem > Linear Zog Hloov [LEEJ] > Linear Zog Hloov [LET] LEEJ yog tus nqi ntawm zog pauv mus rau lub zos ib puag ncig nyob rau hauv daim ntawv ntawm ionizations thiab excitations. Yog li, LET qhia txog lub peev xwm rau kev lom neeg tseem ceeb kev puas tsuaj los ntawm hluav taws xob.
Dab tsi yog cov yam ntxwv ua siab hloov hluav taws xob hloov hluav taws xob LET muaj thaum piv nrog LET hluav taws xob tsawg?
Cov huab hwm coj ntau ntxiv, txo qhov nkag mus. (Vim lawv cov nqi hluav taws xob thiab cov khoom loj heev, lawv ua rau ntau dua ionizations hauv cov ntaub so ntswg, sai sai poob. zog.
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