Yego, ibitanda byo gusiga ibara ry'uruhu bikoresha urumuri rwa UV (ultraviolet), cyane cyane imirasire ya UVA na UVB, kugira ngo bikurure ikorwa rya melanin mu ruhu kandi biruhe ibara ry'uruhu. Dore ibyo ugomba kumenya:
Ubwoko bw'urumuri rwa UV mu bitanda byo gusiga ibara ry'umuhondo
Imirasire ya UVA (95–99% by'umusaruro):
Intego: Binjira cyane mu ruhu, bigatera ibara ry'uruhu ryihuse ariko ry'igihe gito binyuze mu gusiga ogisijeni kuri melanin isanzwe.
Ingaruka: Bifitanye isano no gusaza imburagihe (iminkanyari) no kwiyongera k'ibyago byo kurwara kanseri y'uruhu y'igihe kirekire (melanoma).
Imirasire ya UVB (1–5% by'umusaruro):
Intego: Kugira ingaruka ku ruhu kugira ngo rurusheho kugira ibara ry'uruhu rito ariko rirambye binyuze mu gutuma habaho ikorwa rishya rya melanin.
Ingaruka: Bitera gutwikwa n'izuba kandi bigatera kwangirika kwa ADN.
Ingaruka z'ingenzi zo kwanduzwa n'imirasire y'izuba mu buriri:
Kanseri y'uruhu: OMS ishyira ahantu ho gusiga ibara ry'uruhu mu byiciro bya mbere by'itsinda rya mbere, nk'itabi.
Gusaza imburagihe: UVA isenya kolajeni, bigatera iminkanyari n'amabara y'izuba.
Kwangirika kw'amaso: Kwambara indorerwamo zo kurinda ni ingenzi kugira ngo wirinde indwara ya katarakte.
Uburiri bwo gushushanya ibara ry'izuba ugereranije n'izuba risanzwe
Ikiranga: Uburiri bwo gushushanya ibara ry'izuba ugereranije n'izuba risanzwe
Ubukana bwa UV: Inshuro 3–15 z'izuba ryo ku manywa.
Bihinduka bitewe n'igihe/ikirere.
Igipimo cya UVA/UVB: ahanini UVA (UVB nkeya) ugereranije na UVA/UVB iringaniye
Igihe cyo kwiyerekana: Imyitozo y'iminota 10–20 ugereranije no kwiyerekana buhoro buhoro mu masaha yo hanze.
Ese hari ibitanda bimwe na bimwe bikoresha imirasire ya UV 'idafite ingaruka mbi'?
Oya, nubwo ibitanda bishya bivuga ko 'bitagira ibyago byinshi' (urugero: ibitanda bifite umuvuduko mwinshi wa UVA), irangi ry'imirasire ya UV ritera ibyago byo kurwara kanseri. Kugira ngo ubone urumuri rwizewe, tekereza kuri ibi bikurikira:
- Spray tans (ishingiye kuri DHA, nta UV)
- Amavuta yo kwisiga n'amavuta yo kwisiga
- Ubuvuzi bw'urumuri rutukura (butari UV, ku buzima bw'uruhu).
Ingingo y'ingenzi:
Uburiri bwo gusiga ibara ry'uruhu bukoresha urumuri rwa UV rwinshi kandi ni bubi kurusha izuba. Abaganga b'uruhu bakugira inama yo kubyirinda. Niba uhisemo gusiga ibara ry'uruhu, buri gihe wambare indorerwamo kandi ugabanye igihe cyo kujyayo.