Doorashada qoraxda noqon kartaa wareer. Waxaa jira noocyo kala organic iyo imanba, iyo erey sida UV, SPF iyo ballaaran oo-spectrum haadiyo iyada oo loo marayo. Craig Burkhart, professor ah associate ee maqaarka ee Jaamacadda North Carolina ee Chapel Hill, sharxayaa.
-Heidi Mitchell
Chemical vs. Physical
Malaha inta badan la isticmaalo waa sunscreens “absorbers kiimikada.” Waxay ku jiraan xeryahooda carbon dhigay in shaybaar. Qaar ka mid ah 22 kiimikada ay diyaar noqdaan in laga xoreeyo dalka ah. inay gaashaan maqaarka ka fallaaraha qorraxda ee waxyeelada leh tan PABA ugu horeysay ee Xarunta waxaa la soo saaray 1940.
Corbis
blockers jirka ku yimaadaan laba nooc: macdanta xabagta zinc iyo titanium dioxide-dabiiciga ah dhulka hoos u si wanaagsan budo. Kuwani loo isticmaalo inuu ka tago hadhay caddaan on maqaarka, laakiin processing casri ah farsamooyinka ayaa inta badan iska leh in sameeyey. “Faa'iidada of blockers jirka waa in aanay cawisa iyada oo qoraxda, si ay aragti ahaan nolosha dheer ee aad maqaarka,” Dr. Burkhart sheegay. Dhinaca kale: “Waxay u muuqdaan in ay dareemaan dufan.”
Maamulka Cuntada iyo Dawooyinka The jecel saarayaasha isticmaalaan ereyga organic markay tixraacayaan kiimikada sunscreens-sababta oo ah waxay ka kooban yihiin xeryahooda-iyo carbon imanba, waayo, sunblocks jirka.
Rays of Light
shucaaca qorraxda ayaa imanaya saddex noocyo markuu u yimid, Dhulka: rays UVB, ugu horayn mas'uul ka keenaya gubto, iyo UVA1 iyo UVA2, kaas oo da'da maqaarka. “Laakiin [saddex dhan] ka qayb qaataan horumarinta kansarka maqaarka,” Dr. Burkhart sheegay. sunscreens Broad-spectrum waxaa loogu tala galay in looga difaaco kala duwan oo wavelengths shucaaca.
Marka qoraxda ku dhufan maqaarka, absorbers kiimikada nuugo ah rays UV firfircoon oo sii daayo ay tamar siyaabo aan dhib lahayn. Marka rays UV dhacay maqaarka dahaarka leh ee blockers jirka, ay ka muuqataa oo ma geli karto maqaarka. FDA waxay ku talinaysaa isticmaalaya qoraxda leh SPF ah, ama arrin qorraxda-ilaalinta, oo ugu yaraan 15.
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