Sunscreen Txoj Cai Ua Haujlwm

Inorganic sunscreen cov khoom xyaw yog feem ntau inorganic tshuaj xws li zinc oxide thiab titanium dioxide, uas muaj kev cuam tshuam thiab tawg ultraviolet (UV) hluav taws xob. Organic sunscreen cov khoom xyaw feem ntau yog OMC (octyl methoxycinnamate) thiab oxybenzone, uas nqus UV hluav taws xob thiab hloov lub zog hluav taws xob mus rau hauv tshav kub. Ntau cov tshuaj pleev thaiv hnub tiv thaiv daim tawv nqaij los ntawm UVA thiab UVB rays. UVA thiab UVB ua rau ntau hom kev puas tsuaj rau daim tawv nqaij. Dhau li ntawm cov teeb meem tshuaj pleev ib ce, UV hluav taws xob tuaj yeem ua rau ntau yam teeb meem, qhov loj tshaj plaws yog mob qog noj ntshav. Hauv lwm lo lus, tshuaj pleev thaiv hnub ua haujlwm los ntawm ob qho tib si kev xav thiab nqus ntawm lub teeb. Feem ntau, cov tshuaj inorganic cuam tshuam lub teeb, thaum cov organic absorbs nws. Cov tshuaj absorber feem ntau ntawm UV hluav taws xob yog PABA (para-aminobenzoic acid), uas absorbs UVB. Yog tias koj muaj cov tawv nqaij rhiab heev, koj yuav tsum siv tshuaj pleev thaiv hnub uas muaj PABA nrog ceev faj, vim tias PABA tuaj yeem ua rau liab thiab ua xua rau ntawm daim tawv nqaij rhiab heev. Lwm cov organic tebchaw uas nqus ultraviolet lub teeb muaj xws li: cinnamates, uas nqus UVB; benzophenones, uas nqus UVA; thiab anthranilates, uas nqus tau UVA thiab UVB.