Emission vs Radiation
Peb nyob ib puag ncig nrog hluav taws xob thiab hluav taws xob emitting qhov chaw hauv peb ib puag ncig. Lub hnub yog qhov tseem ceeb tshaj plaws hluav taws xob emitting qhov chaw uas peb txhua tus paub txog. Txhua hnub peb raug hluav taws xob, uas tsis muaj teeb meem lossis qee zaum, ua rau peb raug mob. Tsuas yog cov teebmeem tsis zoo, muaj ntau yam txiaj ntsig los ntawm hluav taws xob rau peb lub neej. Yooj yim, peb pom txhua yam nyob ib puag ncig peb vim muaj hluav taws xob tawm ntawm cov khoom ntawd.
Radiation yog dab tsi?
Radiation yog cov txheej txheem uas nthwv dej lossis cov khoom siv hluav taws xob (xws li: Gamma rays, x-rays, photons) taug kev los ntawm qhov nruab nrab lossis qhov chaw. Lub nuclei tsis ruaj khov ntawm cov khoom siv hluav taws xob tau sim ua kom ruaj khov los ntawm kev tawm hluav taws xob. Radiation tuaj yeem yog ionizing lossis non-ionizing. Ionizing hluav taws xob muaj lub zog siab, thiab thaum nws sib tsoo nrog lwm lub atom, nws yuav raug ionized, emitting lwm cov khoom (xws li electron) los yog photons. Lub emission photon los yog particle yog hluav taws xob. Thawj qhov hluav taws xob yuav txuas ntxiv ionize lwm cov ntaub ntawv kom txog thaum tag nrho nws lub zog siv. Alpha emission, beta emission, X-rays, gamma rays yog ionizing hluav taws xob. Alpha hais muaj cov nqi zoo, thiab lawv zoo ib yam li cov nucleus ntawm Nws atom. Lawv tuaj yeem taug kev hla luv luv. (piv txwv li ob peb centimeters). Beta hais zoo ib yam li electrons loj thiab nqi. Lawv tuaj yeem taug kev ntev dua li alpha hais. Gamma thiab x-rays yog photons, tsis hais. Gamma rays yog tsim nyob rau hauv ib tug nucleus, thiab x-rays yog tsim nyob rau hauv lub electron plhaub ntawm ib tug atom.
Tsis yog ionizing hluav taws xob tsis tawm cov khoom los ntawm lwm cov ntaub ntawv, vim tias lawv lub zog qis dua. Txawm li cas los xij, lawv muaj lub zog txaus los txhawb cov electrons los ntawm qib av mus rau qib siab dua. Lawv yog cov hluav taws xob hluav taws xob, yog li muaj hluav taws xob thiab cov khoom sib nqus sib nqus ua ke mus rau ib leeg thiab mus rau yoj propagation kev taw qhia. Ultra violet, infra liab, pom lub teeb, microwave yog qee qhov piv txwv rau cov hluav taws xob tsis muaj ionizing. Peb tuaj yeem tiv thaiv peb tus kheej los ntawm kev puas tsuaj hluav taws xob los ntawm kev tiv thaiv. Hom kev tiv thaiv yog txiav txim los ntawm lub zog ntawm hluav taws xob.
Emission yog dab tsi?
Emission yog txheej txheem ntawm kev tso hluav taws xob. Thaum cov atoms, molecules, lossis ions nyob hauv av, lawv tuaj yeem nqus tau lub zog thiab mus rau qib siab siab. Cov theem saum toj no tsis ruaj khov. Yog li ntawd, lawv zoo li tso tawm lub zog absorbed rov qab thiab tuaj rau hauv av xeev. Lub zog tso tawm lossis nqus tau sib npaug ntawm lub zog sib txawv ntawm ob lub xeev. Thaum tso tawm lub zog raws li photons, lawv tuaj yeem nyob hauv thaj tsam ntawm lub teeb pom kev, X-ray, UV, IR, lossis lwm yam electromagnetic yoj nyob ntawm lub zog sib txawv ntawm ob lub xeev. Lub wavelengths ntawm emission hluav taws xob tuaj yeem txiav txim siab los ntawm kev kawm txog emission spectroscopy. Emission tuaj yeem yog ob hom, spontaneous emission thiab stimulated emission. Spontaneous emission yog qhov tau piav qhia yav dhau los. Nyob rau hauv stimulated emission, thaum lub electromagnetic hluav taws xob cuam tshuam nrog teeb meem, lawv txhawb ib tug electron ntawm ib tug atom kom poob mus rau ib tug qis zog theem tso tawm lub zog.
Dab tsi yog qhov txawv ntawm Radiation thiab Emission?
• Emission yog qhov ua kom muaj hluav taws xob. Radiation yog tus txheej txheem uas cov emission photons mus los ntawm qhov nruab nrab.
• Radiation tuaj yeem ua rau emissions thaum nws cuam tshuam nrog teeb meem.
