Ultraviolet (UV) teeb nyem tau yog ib qho khoom siv nrov thiab muaj txiaj ntsig hauv ntau qhov chaw xws li kev tshawb nrhiav, kev tshawb fawb, thiab txawm nyob hauv koj tsev neeg, xws li nrhiav cov nyiaj cuav thiab cov stains ntawm koj cov ntaub pua plag. Txawm li cas los xij, muaj ob hom teeb ci UV uas muaj qhov sib txawv wavelengths, 365nm thiab 395nm. Yog li, qhov twg zoo dua? Cia peb tshawb nrhiav.
Txhawm rau pib, peb yuav tsum nkag siab tias cov lej no sawv cev li cas. Tus lej hais txog qhov wavelength ntawm UV teeb hauv nanometers (nm). 365nm emits shortwave UV teeb, thiab 395nm emits longwave UV teeb. Shortwave muaj zog dua thiab txaus ntshai, vim nws tuaj yeem ua rau lub qhov muag thiab tawv nqaij, thaum lub sijhawm ntev tsis muaj teeb meem tab sis tsis muaj zog. Qhov no yog vim li cas qee qhov chaw, xws li tsev kho mob thiab tsev kawm ntawv, txwv tsis pub siv lub teeb hluav taws xob luv luv UV hauv thaj chaw pej xeem.
Tam sim no, cia peb tham txog lawv daim ntawv thov. 365nm UV lub teeb yog siv ntau dua hauv cov chaw soj ntsuam xyuas thiab kuaj xyuas cov kua dej hauv lub cev, suav nrog ntshav, zis, thiab phev. Nws yog vim qee cov kua dej fluoresce ci ntsa iab hauv qab 365nm irradiation, ua kom yooj yim pom thiab sau cov pov thawj. Ntawm qhov tod tes, 395nm UV lub teeb muaj ntau yam hauv kev siv txhua hnub, xws li kuaj ID, nrhiav tsiaj stains, thiab nrhiav cov kab laug sab thiab lwm yam kab tsuag.
Tab sis, nco ntsoov tias vim li cas rau kev tshuaj xyuas cov fluoresce ntawm cov khoom koj xav tau yog qhov tseem ceeb kom nkag siab. Muaj kev hloov pauv ntawm UV teeb uas siv rau qhov sib txawv. Piv txwv li, lub teeb 405 nm UV tuaj yeem ntes cov kab mob thiab cov kab mob uas tsis muaj qhov muag tsis pom.
Raws li kev ua haujlwm ntev, 395nm UV teeb yog qhov kev xaiv zoo dua vim nws muaj lub neej ntev dua 365nm. Tsis tas li ntawd, 395nm UV teeb nyem yog pheej yig dua piv rau 365nm. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum tau ceev faj thaum yuav pheej yig UV teeb nyem kom tsis txhob tau txais cov khoom tsis zoo.
Hauv kev xaus, txhua lub wavelengths muaj nws cov ntawv tshwj xeeb, thiab xaiv qhov twg yog qhov zoo dua nyob ntawm koj cov kev xav tau. Yog tias koj nyob hauv kev lag luam forensic, ces xaiv 365nm UV teeb yuav zoo dua rau koj. Txawm li cas los xij, yog tias koj tab tom nrhiav txhua lub hom phiaj UV teeb rau kev siv txhua hnub, xaiv qhov ntsuas 395nm UV teeb yuav yog qhov kev xaiv zoo dua. Tab sis nco ntsoov nco ntsoov tias kev nyab xeeb ntawm koj tus kheej thiab lwm tus yog qhov tseem ceeb tsis hais lub hom phiaj twg, yog li xaiv cov teeb pom kev zoo UV los ntawm cov npe ntseeg siab thiab siv lawv nrog kev saib xyuas.
