Qhov txawv ntawm UV-A thiab UV-C yog dab tsi?

Qhov ntau yam ntawm cov xim nyob rau hauv qhov pom spectrum yog hais txog qhov sib npaug ntawm lub teeb ultraviolet. Txawm li cas los xij, peb feem ntau saib qhov no thaum txiav txim siab UV lub teeb, tsuas yog faib nws raws li ib qho spectrum ntawm wavelengths txuas rau nws cov teebmeem mob qog noj ntshav nrog rau nws cov txiaj ntsig hauv fluorescence, kho, thiab tshuaj tua kab mob. Txawm li cas los xij, vim tias txhua hom ultraviolet lub zog muaj ntau yam zoo, nws yog ib qho tseem ceeb kom paub qhov txawv ntawm lawv. Qhov sib txawv tseem ceeb ntawm UV-A thiab UV-C hluav taws xob nyob rau hauv cov nqe lus ntawm lawv cov kev siv thiab kev siv yog nyob rau hauv tsab xov xwm no.

Thawj txoj hauv kev los txheeb xyuas lub zog ultraviolet yog los ntawm nws qhov wavelength. Hom ultraviolet lub zog yog txiav txim siab los ntawm tus nqi wavelength, uas qhia hauv nanometers (nm). Wavelengths ntawm 315 thiab 400 nanometers suav nrog UV-A, thiab cov nyob nruab nrab ntawm 100 thiab 280 nanometers suav nrog UV-C. Lub wavelengths ntawm UV-B yog li ntawm 280 txog 315 nanometers.

Tib txoj kev uas tib neeg tsis tuaj yeem pom qhov pom tau tias lub teeb ci liab lossis xiav, nws tuaj yeem ua rau muaj kev cuam tshuam me ntsis kom paub tias UV-A thiab UV-C yog ob qho tib si tsis pom qhov muag tsis pom. Paub txog lub teeb lub teeb uas koj yuav xav tau rau koj daim ntawv thov tshwj xeeb- lossis tsawg kawg, kev nkag siab txog qhov sib txawv ntawm UV-A thiab UV-C hluav taws xob- yog li tseem ceeb dua.

Feem ntau ntawm UV-Ib daim ntawv thov teeb siv lub wavelength ntawm 365 nanometers thiab tuaj yeem faib ua fluorescence lossis curing applications. Cov txheej txheem los ntawm cov tshuaj xws li xim, pigments, los yog minerals hloov UV-Ib lub zog rau hauv lub teeb pom kev yog hu ua fluorescence.365nm curing UV teebsiv rau cov hom phiaj no hu ua blacklights vim hais tias, txawm hais tias lawv tshwm tsaus, lawv emit ntau yam xim pom thaum ci rau ntawm cov khoom sib txawv.

Ib qho piv txwv ntawm lub pob zeb uas nthuav tawm ntsuab fluorescence nyob rau hauv lub realUVTM LED teeb nyem yuav pom hauv qab no. Hauv ntau qhov chaw, suav nrog forensics, tshuaj, molecular biology, thiab geology, UV-A fluorescence yog qhov tseem ceeb tshaj plaws vim tias nws yuav raug siv los kuaj pom muaj cov khoom siv fluorescent uas yuav tsis muaj peev xwm cais tawm raws li lub teeb pom kev zoo.
Kev siv fluorescence tsis txwv rau kev tshawb fawb. Fluorescence tuaj yeem siv rau kev teeb tsa duab kos duab thiab yees duab fluorescence, nrog rau lwm yam kev pom zoo. Tej zaum koj yuav lossis tsis nco qab lub teeb pom kev tsaus ntuj, tab sis ntau qhov chaw lom zem kuj tseem yuav siv UV-A los tsim cov teebmeem fluorescence.
365 nm thiab 395 nm yog cov feem ntau pom wavelengths rau UV-A fluorescence. Ob leeg 395 thiab 365 nm feem ntau yuav tsim cov teebmeem fluorescence, txawm hais tias 395 nm yuav muaj qhov pom me ntsis violet / liab doog, thaum 365 nm yuav muab "huv" UV cuam tshuam nrog cov teeb pom kev tsawg dua. Saib peb tsab xov xwm sib piv 365 nm thiab 395 nm kom paub meej ntxiv.

Nyob rau hauv sib piv rau fluorescence, UV-A yog siv nyob rau hauv kev kho daim ntawv thov thiab muaj peev xwm ua rau cov tshuaj thiab cov qauv kev hloov nyob rau hauv ntau yam ntaub ntawv. Kev kho yog feem ntau ua tiav nrog tib lub UV-Ib wavelengths tab sis xav tau ntau dua ntawm UV siv. Zoo ib yam li fluorescence, 365 nm yog ib qho kev siv ntau zaus kho wavelength.

UV-Ib hluav taws xob yog siv los kho cov xim emulsion hauv kev tshuaj ntsuam luam ntawv, nrog rau kho cov epoxies thiab cov ntsia hlau ntsia thawv. Rau UV-Ib daim ntawv thov kho, qhov ntev ntawm qhov kis yog qhov tseem ceeb npaum li kev siv zog.

UV-C wavelengths me me, xws li 100 nm txog 280 nm, dua li UV-Ib wavelengths. Cov kab mob xws li kab mob, pwm, fungus, thiab kab mob tuaj yeem ua rau tsis muaj zog los ntawm kev siv UV-C wavelengths.

Txij li DNA thiab RNA tuaj yeem raug puas tsuaj ntawm thiab nyob ib ncig ntawm 265 nanometers, UV-C yog ib qho kev siv tshuaj tua kab mob zoo. Los ntawm cov txheej txheem hu ua dimerization, ob daim ntawv cog lus tuav thymine thiab adenine ua ke tau tawg thaum cov kab mob raug UV-C wavelength teeb, hloov lub genome tus qauv. Vim tias qhov kev hloov pauv no, tus kab mob no tsis tuaj yeem ua tiav rov ua dua lossis ntau ntxiv thaum nws sim ua li ntawd vim yog kev ua txhaum ntawm caj ces.

Vim hais tias thymine (uracil hauv RNA) yog lub wavelength rhiab heev, UV-C muaj peev xwm tshwj xeeb los ua cov tshuaj tua kab mob. Raws li daim ntawv qhia hauv qab no, uracil thiab thymine tsis muaj peev xwm nqus UV lub teeb ntawm wavelengths ntev dua 300 nanometers.
Daim duab qhia pom tias UV-C hluav taws xob muaj peev xwm pib dimerization, thaum UV- tsis muaj hluav taws xob. Vim UV-A tsis tuaj yeem tsom mus rau DNA cov qauv ntawm cov kab mob, nws tsis yog txoj hauv kev siv tshuaj tua kab mob zoo, raws li tag nrho cov ntaub ntawv muaj.

Nws yog ib qho kev nkag siab tsis tu ncua uas lub hnub ci ntuj muaj UV rays ntawm txhua yam. Tag nrho UV lub zog wavelengths yog suav nrog hnub ci hluav taws xob, txawm li cas los xij tsuas yog UV-A thiab qee qhov UV-B rays tuaj yeem nkag mus rau hauv lub ntiaj teb huab cua. Piv txwv li, UV-C tsis ncav cuag hauv av vim nws yog absorbed los ntawm ozone txheej.

Txhua lub zog ultraviolet yuav tsum tau ua nrog ceev faj heev vim, raws li US HHS, tag nrho UV wavelengths -xws li UV-A, UV-B, thiab UV-C- yog xav tias yog carcinogenic. Txij li UV hluav taws xob tsis pom, nws tuaj yeem ua rau muaj kev phom sij tshwj xeeb vim, tsis zoo li pom lub teeb, nws tsis ua rau lub cev squint lossis tig tawm. Txawm li cas los xij, muaj ntau yam kev tshawb fawb thiab cov pej xeem- cov kev tshawb fawb qib uas muab peb qee qhov kev pom ntawm qhov muaj feem cuam tshuam thiab kev puas tsuaj uas UV-Ib qho tuaj yeem ua rau vim peb paub tias UV-Ib hluav taws xob ntau dua thaum nruab hnub nruab hnub.

Ntawm qhov tod tes, qhov nruab nrab tib neeg tsis tu ncua los tiv thaiv UV -C hluav taws xob. Rau cov haujlwm tshwj xeeb thiab cov haujlwm, xws li vuam, feem ntau ntawm cov kev tshawb fawb tau ua nrog kev ua haujlwm noj qab haus huv thiab kev nyab xeeb hauv siab. Yog li ntawd, kev tshawb fawb tsawg dua tau ua tiav ntawm qhov kev phom sij thiab kev puas tsuaj uas tshwm sim los ntawm UV-C. Vim tias nws luv luv wavelength, UV-C muaj lub zog ntau dua los ntawm qhov kev xav ntawm lub cev, thiab peb paub tias nws ncaj qha rhuav tshem DNA molecules. Nws yuav zoo rau xav tias nws tuaj yeem tsim teeb meem rau tib neeg ntau dua li UV-A thiab UV-B, uas yog hom UV tsis muaj zog. Yog li ntawd, yuav tsum tau saib xyuas ntau dua los tiv thaiv UV -C raug.