Qhov txawv ntawm UV-A thiab UV-C yog dab tsi?
Ultraviolet lub teeb yuav luag sib txawv raws li cov xim ntawm cov spectrum pom. Txawm li cas los xij, thaum peb xav txog UV, peb nyiam saib qhov no thiab tsuas yog faib nws raws li qhov sib txawv ntawm cov wavelengths txuas nrog nws cov khoom siv hauv fluorescence, kho, thiab tshuaj tua kab mob, nrog rau nws cov txiaj ntsig carcinogenic. Nws yog ib qho tseem ceeb, txawm li cas los xij, kom sib txawv ntawm ntau hom ntawm UV hluav taws xob, vim tias txhua tus muaj qhov tshwj xeeb zoo. Hauv kab lus no, peb saib qhov sib txawv tseem ceeb ntawm UV-A thiab UV-C hluav taws xob raws li kev siv thiab kev siv.
Nrhiav tus nqi Wavelength ua ntej
Lub wavelength ntawm ultraviolet hluav taws xob yog qhov tseem ceeb tshaj plaws hauv kev txheeb xyuas nws. Lub wavelength, ntsuas hauv nanometers (nm), cuam tshuam rau hom UV teeb. UV-Ib wavelengths nyob ntawm315 rau 400 nanometers, whereas UV-C wavelengths nyob nruab nrab ntawm 100 thiab 280 nanometers. UV-B wavelengths nyob nruab nrab ntawm 280 thiab 315 nanometers.
Ob qho UV-A thiab UV-C tsis pom rau tib neeg lub qhov muag, yog li nws yuav zoo li tsis zoo vim tias koj tsis tuaj yeem pom qhov txawv ntawm ob hom UV no tib yam uas peb tuaj yeem pom qhov pom tau tias lub teeb liab lossis xiav. Yog li ntawd, nws yog ib qho tseem ceeb uas koj nkag siab qhov wavelength lub teeb qhov chaw koj yuav xav tau rau koj daim ntawv thov tshwj xeeb, nrog rau qhov sib txawv ntawm UV-A thiab UV-C hluav taws xob.
UV-A: Fluorescence thiab Curing
Feem ntau ntawm UV-Ib daim ntawv thov teeb yog cais raws li fluorescence lossis kho, thiab lawv siv lub wavelength ntawm 365 nanometers. Fluorescence tshwm sim thaum cov ntaub ntawv xws li xim, xim, los yog minerals hloov UV-Ib lub teeb rau hauv lub teeb pom kev. UV teeb siv nyob rau hauv xws li daim ntaub ntawv yog lub npe hu ua blacklights vim hais tias lawv zoo li tsaus nti, tsis tau thaum ci rau lwm yam, lawv tsim ntau yam xim pom.
Lub teeb realUV ™ LED teeb ua rau ntsuab fluorescence ntawm lub pob zeb, raws li pom hauv qab no. UV-A fluorescence yog qhov muaj txiaj ntsig zoo hauv ntau daim ntawv thov, suav nrog kev tshawb fawb, tshuaj, molecular biology, thiab geology, qhov muaj peev xwm los txheeb xyuas qhov pom ntawm qee cov luminous compounds uas yuav tsis tuaj yeem tshawb pom nyob rau hauv ib txwm teeb pom kev zoo yog qhov txiaj ntsig zoo.
Tsis yog txhua daim ntawv thov fluorescence yog txwv rau kev tshawb fawb. Fluorescence tuaj yeem siv los muab ntau yam kev cuam tshuam pom kev zoo, suav nrog kev yees duab fluorescence thiab teeb duab kos duab teeb tsa. Ntau qhov chaw lom zem, zoo li lub teeb pom kev tsaus ntuj uas koj yuav lossis tsis nco qab, tuaj yeem siv UV-A los tsim cov teebmeem fluorescence.
Feem ntau UV-Ib fluorescence wavelengths yog 365 thiab 395 nm. Feem ntau, ob qho tib si 365 thiab 395 nm tsim cov teebmeem fluorescence; Txawm li cas los xij, 365 nm ua rau "ntxhiab" UV cuam tshuam nrog lub teeb pom kev tsawg dua, thiab 395 nm muaj qhov pom ntawm violet / liab doog.
Tsis zoo li fluorescence, UV-A tuaj yeem ua rau muaj tshuaj lom neeg thiab cov qauv kev hloov pauv hauv ntau yam khoom siv thiab ua haujlwm hauv cov txheej txheem kho. Kev kho yuav tsum muaj qhov ntau dua ntawm UV siv, tab sis nws tseem ua tau siv tib lub UV-Ib wavelengths. Raws li nrog fluorescence, 365 nm yog ib qho kev kho wavelength nquag.
UV-Ib wavelengths yog siv los kho cov xim emulsion hauv kev tshuaj ntsuam luam ntawv, nrog rau epoxies rau kev lag luam siv thiab ntsia thawv gel. Ntxiv nrog rau kev siv zog, tag nrho lub sijhawm raug kis yog qhov tseem ceeb hauv UV-Kev siv tshuaj kho.
UV-C: Kev siv tshuaj tua kab mob thiab tshuaj tua kab mob
Tsis zoo li UV-A, UV-C wavelengths luv luv, xws li 100 nm txog 280 nm. UV-C wavelengths tau qhia tias yog ib txoj hauv kev ua kom tsis muaj kab mob xws li kab mob, kab mob, pwm, thiab kab mob.
UV-C yog cov kab mob kis tau zoo vim tias DNA thiab RNA muaj kev cuam tshuam rau kev puas tsuaj ntawm lossis ib puag ncig 265 nanometers. Thaum cov kab mob tshwm simUV -C wavelengthhluav taws xob, ob daim ntawv cog lus uas txuas thymine thiab adenine tau tawg hauv cov txheej txheem hu ua dimerisation, uas hloov cov qauv ntawm cov kab mob DNA. Vim tias qhov kev hloov pauv no, thaum tus kab mob sim rov ua dua lossis rov tsim dua, cov caj ces kev noj nyiaj txiag txwv tsis pub nws ua tiav.
UV-C yog qhov tshwj xeeb hauv nws lub peev xwm los ua cov tshuaj tua kab mob vim yog qhov tsis muaj zog ntawm thymine (uracil hauv RNA). Cov duab hauv qab no qhia tau hais tias thymine thiab uracil tsis nqus UV lub teeb ntawm wavelengths ntau dua 300 nanometers.
Raws li daim ntawv qhia, UV-Ib hluav taws xob tsis tuaj yeem ua rau muaj qhov tsis zoo ib yam li UV-C teeb ua. Raws li qhov tshwm sim, txhua qhov kev tshawb fawb muaj qhia tias UV-A tsis zoo li tshuaj tua kab mob vim nws tsis tuaj yeem tsom cov kab mob DNA.
UV-A muaj nyob rau nruab hnub, tab sis UV-C tsis yog
Ib qho kev nkag siab tsis meej yog tias lub hnub ci ntuj muaj txhua hom hluav taws xob ultraviolet. Thaum lub hnub ci hluav taws xob muaj tag nrho cov wavelengths ntawm UV lub zog, tsuas yog UV-A thiab qee qhov UV-B taug kev los ntawm lub ntiaj teb huab cua. UV-C, ntawm qhov tod tes, yog nqus los ntawm lub ntiaj teb ozone txheej ua ntej mus txog hauv av.
Raws li US HHS, tag nrho cov UV wavelengths, suav nrog UV-A, UV-B, thiab UV-C, yog qhov xav tias muaj cov kab mob carcinogens thiab yuav tsum tau ua tib zoo saib xyuas. UV hluav taws xob yog qhov txaus ntshai tshwj xeeb vim nws tsis ua rau peb squint lossis tig mus rau tib txoj kev uas pom lub teeb. Txawm li cas los xij, peb paub tias UV-Ib hluav taws xob muaj ntau nyob rau nruab hnub nruab hnub, thiab vim li ntawd, muaj kev tshawb fawb ntau ntxiv thiab cov pej xeem- cov kev tshawb fawb qib uas ua rau peb paub zoo dua txog kev phom sij thiab kev puas tsuaj uas UV-A tuaj yeem nqa tau.
Hauv qhov sib piv, UV-C hluav taws xob tsis yog ib yam uas tib neeg feem ntau raug rau ib ntus. Cov kev tshawb fawb feem ntau tau ua tiav nrog kev ua haujlwm kev noj qab haus huv thiab kev nyab xeeb hauv siab, tsom mus rau cov haujlwm tshwj xeeb thiab cov haujlwm xws li cov vuam. Raws li qhov tshwm sim, kev tshawb fawb tsawg dua tau ua rau muaj kev pheej hmoo thiab ua rau muaj kev puas tsuaj los ntawm UV-C. Los ntawm qhov kev xav ntawm lub cev, UV-C muaj lub zog loj dua vim nws qhov luv wavelength, thiab peb paub tias nws ncaj qha rhuav tshem DNA molecules. Nws tsim nyog ntseeg tias nws muaj peev xwm ua rau tib neeg puas tsuaj ntau dua li cov UV tsawg dua, xws li UV-A thiab UV-B. Yog li ntawd, yuav tsum tau ceev faj ntxiv los tiv thaiv UV-C raug.
