UKWELASHWA OKUNCANE
Ingasetshenziswa noma nini, kuhlanganise nasebusuku.
Ingasetshenziswa ngaphakathi endlini, ngasese.
Izindleko zokuqala kanye nezindleko zikagesi
Ukukhanya okunempilo
Amandla angahlukahluka
Akukho ukukhanya kwe-UV okuyingozi
Akukho vithamini D
Kungathuthukisa ukukhiqizwa kwamandla
Kunciphisa ubuhlungu kakhulu
Akuholeli ekushiseni kwelanga
UKUKHANYA KWELANGA KWEMVELO
Akutholakali njalo (isimo sezulu, ubusuku, njll.)
Kutholakala ngaphandle kuphela
Okwemvelo, akukho zindleko
Ukukhanya okunempilo nokungaphilile
Amandla awakwazi ukuhlukahluka
Ukukhanya kwe-UV kungaholela ekulimaleni kwesikhumba njll.
Kusiza ekukhiqizweni kwevithamini D
Yehlisa ubuhlungu ngokulinganisela
Kuholela ekushiseni kwelanga
Ukwelashwa ngokukhanya okubomvu kuyithuluzi elinamandla neliguquguqukayo, kodwa ingabe kungcono kunokumane uphume uye elangeni?
Uma uhlala endaweni esenyakatho enamafu, engenalo ithuba lokufinyelela elangeni njalo, khona-ke ukwelashwa ngokukhanya okubomvu kuyinto elula - ukwelashwa ngokukhanya okubomvu kungenza kube lula ukuthola ukukhanya kwemvelo okuncane. Kulabo abahlala ezindaweni ezishisayo noma kwezinye izindawo ezinokukhanya kwelanga okunamandla cishe nsuku zonke, impendulo iyinkimbinkimbi kakhulu.
Umehluko obalulekile phakathi kokukhanya kwelanga nokukhanya okubomvu
Ukukhanya kwelanga kuqukethe ububanzi obubanzi bokukhanya, kusukela ekukhanyeni kwe-ultraviolet kuya ku-near-infrared.
Okuqukethwe ngaphakathi kwe-sunlight spectrum kukhona ama-wavelength anempilo abomvu kanye ne-infrared (athuthukisa ukukhiqizwa kwamandla) kanye nokukhanya kwe-UVb (okukhuthaza ukukhiqizwa kwe-vitamin D). Kodwa-ke kune-wavelength ngaphakathi kwelanga eyingozi kakhulu, njengoluhlaza okwesibhakabhaka kanye ne-violet (okunciphisa ukukhiqizwa kwamandla kanye nokulimaza amehlo) kanye ne-UVa (okubangela ukushiswa yilanga/ukushiswa yilanga kanye nokuthwebula izithombe/umdlavuza). Lo mbala obanzi ungadingeka ekukhuleni kwezitshalo, i-photosynthesis kanye nemiphumela ehlukahlukene kuma-pigment ezinhlotsheni ezahlukene, kodwa akuzona zonke izinzuzo kubantu kanye nezilwane ezincelisayo ngokujwayelekile. Yingakho ama-sunscreen okuvimbela ilanga kanye ne-SPF edingeka ekukhanyeni kwelanga okunamandla.
Ukukhanya okubomvu kuyi-spectrum encane, ehlukanisiwe, cishe kusukela ku-600-700nm - ingxenye encane yokukhanya kwelanga. I-infrared esebenzayo ngokwezinto eziphilayo isukela ku-700-1000nm. Ngakho-ke ubude bamaza okukhanya obukhuthaza ukukhiqizwa kwamandla buphakathi kuka-600 no-1000nm. Lawa maza athile obubomvu kanye ne-infrared anemiphumela emihle kuphela ngaphandle kwemiphumela emibi eyaziwayo noma izingxenye eziyingozi - okwenza ukwelashwa kokukhanya okubomvu kube uhlobo lokwelapha olungenakukhathazeka uma kuqhathaniswa nokukhanya kwelanga. Azikho izikhilimu ze-SPF noma izingubo zokuzivikela ezidingekayo.
Isifinyezo
Isimo esihle kakhulu kungaba ukufinyelela kokubili elangeni lemvelo kanye nohlobo oluthile lokwelashwa ngokukhanya okubomvu. Thola ukukhanya kwelanga uma ukwazi, bese usebenzisa ukukhanya okubomvu ngemva kwalokho.
Ukukhanya okubomvu kucwaningwa maqondana nokushiswa yilanga kanye nokusheshisa ukuphulukiswa komonakalo wemisebe ye-UV. Okusho ukuthi ukukhanya okubomvu kunomthelela ovikelayo ekulimaleni okungenzeka kokukhanya kwelanga. Kodwa-ke, ukukhanya okubomvu kukodwa ngeke kukhuthaze ukukhiqizwa kwevithamini D esikhumbeni, okudinga ukukhanya kwelanga.
Ukuthola ukukhanya kwelanga okulinganiselwe esikhumbeni ukuze kukhiqizwe i-vitamin D, kuhlanganiswe nokwelashwa kokukhanya okubomvu ngosuku olufanayo ukuze kukhiqizwe amandla eselula mhlawumbe kuyindlela evikela kakhulu.