{"id":6286,"date":"2020-05-24T18:27:23","date_gmt":"2020-05-24T11:27:23","guid":{"rendered":"https:\/\/bacdau.vn\/?post_type=kb&p=6286"},"modified":"2020-05-24T18:28:43","modified_gmt":"2020-05-24T11:28:43","slug":"tia-uv-la-gi","status":"publish","type":"kb","link":"https:\/\/bacdau.vn\/kb\/tia-uv-la-gi\/","title":{"rendered":"Tia UV l\u00e0 g\u00ec?"},"content":{"rendered":"

Tia UV<\/a> hay \u0111\u01b0\u1ee3c g\u1ecdi v\u1edbi c\u00e1i t\u00ean kh\u00e1c l\u00e0 tia c\u1ef1c t\u00edm n\u00f3 c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1edbn l\u00ean c\u00f3 th\u1ec3 con ng\u01b0\u1eddi nh\u1ea5t l\u00e0 v\u00f9ng da. \u0110\u1eb7c bi\u1ec7t UV l\u00e0 nguy\u00ean nh\u00e2n s\u1ed1 m\u1ed9t g\u00e2y ung th\u01b0 da. C\u00f9ng b\u1eafc \u0111\u1ea9u t\u00ecm hi\u1ec3u v\u1ec1 t\u00e1c h\u1ea1i to l\u1edbn c\u1ee7a lo\u1ea1i tia \u0111\u1ed9c hai n\u00e0y nh\u00e9<\/p>\n

Tia c\u1ef1c t\u00edm c\u00f3 \u1edf \u0111\u00e2u? C\u00e2u tr\u1ea3 l\u1eddi l\u00e0 n\u00f3 th\u01b0\u1eddng n\u1eb1m trong anh s\u00e1ng t\u1ef1 nhi\u00ean vi\u1ec7c ti\u1ebfp x\u00fac v\u1edbi lo\u1ea1i tia c\u00f3 hai n\u00e0y h\u00e0ng ng\u00e0y s\u1ebd \u1ea3nh h\u01b0\u1edfng t\u1edbi c\u01a1 th\u1ec3, \u0111\u1eb7c bi\u1ec7t l\u00e0 m\u1eaft v\u00e0 v\u00f9ng da.<\/p>\n

Tia UV c\u00f3 hai lo\u1ea1i: UVA v\u00e0 UVB c\u1ea3 hai \u0111\u1ec1u kh\u00f4ng n\u1eb1m trong quang ph\u1ed5 c\u1ee7a tia s\u00e1ng m\u00e0 \u0111\u00f4i m\u1eaft b\u1ea1n c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c. C\u00e1c tia s\u00e1ng c\u00f3 b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau v\u00e0 \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb \u201cnm\u201d v\u1edbi t\u1ef7 l\u1ec7 quy \u0111\u1ed5i 1nm = 1\/1000.000.000m. \u0110i\u1ec3m nhau gi\u1eefa UVA v\u00e0 UVB l\u00e0 g\u00ec? Ch\u00fang t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn c\u01a1 th\u1ec3 theo nh\u1eefng c\u00e1ch nh\u01b0 th\u1ebf n\u00e0o? H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y c\u1ee7a ch\u00fang t\u00f4i nh\u00e9!<\/p>\n

\"s\u1ef1
s\u1ef1 kh\u00e1c nhau UVA v\u00e0 UVB<\/figcaption><\/figure>\n

Tia UVA l\u00e0 gi?<\/h2>\n

Tia UVA hay \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tia s\u00e1ng d\u00e0i, n\u00f3 chi\u1ebfm kho\u1ea3ng 95\/100 tia c\u1ef1c t\u00edm chi\u1ebfu \u0111\u1ebfn c\u01a1 th\u1ec3 ch\u00fang ta. G\u1ea7n nh\u01b0 UVA v\u00e0 UVB \u0111\u1ec1u g\u00e2y h\u1ea1i cho da nh\u01b0ng UVA ch\u00ednh l\u00e0 m\u1ed1i \u0111e d\u1ecda r\u1ea5t l\u01a1n, ch\u00fang c\u00f3 kh\u0103p n\u00f3i v\u00e0 quanh n\u0103m, ngay c\u1ea3 khi b\u1ea7u tr\u1eddi c\u00f3 nhi\u1ec1u m\u00e2y v\u00e0 m\u1eb7t tr\u1eddi kh\u00f4ng l\u00f3 r\u1ea1ng. M\u1ecdi l\u00fac khi n\u00e0o b\u1ea1n tr\u00f4ng th\u1ea5y \u00e1nh s\u00e1ng ban ng\u00e0y th\u00ec ch\u00ednh l\u00e0 khi m\u00e0 tia UVA hi\u1ec7n di\u1ec7n.<\/p>\n

Tia UVA c\u00f3 b\u01b0\u1edbc s\u00f3ng b\u1eaft \u0111\u1ea7u t\u1eeb 3<\/p>\n

20 nm t\u1edbi 400 nm, g\u1ed3m c\u00f3 hai tia: UVA2 (320-340 nm) v\u00e0 UVA1 (b\u01b0\u1edbc s\u00f3ng 340-400 nm) . S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa b\u01b0\u1edbc s\u00f3ng r\u1ea5t quan tr\u1ecdng b\u1edfi c\u00e1c ho\u1ea1t ch\u1ea5t ch\u1ed1ng n\u1eafng kh\u00e1c nhau cho hi\u1ec7u su\u1ea5t b\u1ea3o v\u1ec7 cao nh\u1ea5t \u0111\u1ed1i v\u1edbi c\u00e1c tia c\u00f3 b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau, t\u1eeb \u0111\u00f3 c\u0169ng l\u00e0 l\u00fd do c\u00e1c s\u1ea3n ph\u1ea9m ch\u1ed1ng n\u1eafng th\u01b0\u1eddng ch\u1ee9a nhi\u1ec1u th\u00e0nh ph\u1ea7n ho\u1ea1t t\u00ednh. Tuy v\u1eady m\u1ed9t s\u1ed1 ho\u1ea1t ch\u1ea5t ch\u1eb3ng h\u1ea1n nh\u01b0 titanium dioxide, zinc oxide c\u00f3 kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 tr\u00ean to\u00e0n b\u1ed9 quang ph\u1ed5 c\u1ee7a tia UVA.<\/p>\n

\u0110\u01b0\u1ee3c coi l\u00e0 k\u1ebb gi\u1ebft ng\u01b0\u1eddi th\u1ea7m l\u1eb7ng ch\u00ednh tia UVA x\u00e2m nh\u1eadp c\u00e1c m\u00f4, ph\u00e1 h\u1ecfng bi\u1ec3u b\u1ecb g\u00e2y ung th\u01b0 cho con ng\u01b0\u1eddi m\u00e0 kh\u00f4ng ai hay bi\u1ebft. B\u1edfi kh\u00f4ng gi\u1ed1ng nh\u01b0 tia UVB, b\u1ea1n kh\u00f4ng h\u1ec1 c\u1ea3m nh\u1eadn nh\u1eefng \u1ea3nh h\u01b0\u1edfng c\u1ee7a n\u00f3, nh\u01b0ng th\u1ef1c ra n\u00f3 \u0111ang th\u00e2m nh\u1eadp s\u00e2u v\u00e0o da, t\u00e0n ph\u00e1 m\u1ecdi t\u1ea7ng c\u1ee7a da m\u1ed9t c\u00e1ch \u00e2m th\u1ea7m. UVA l\u00e0 ngu\u1ed3n g\u1ed1c h\u00e0ng \u0111\u1ea7u d\u1eabn \u0111\u1ebfn n\u1ebfp nh\u0103n v\u00e0 l\u00e0m t\u0103ng ph\u1ea7n l\u1edbn nguy c\u01a1 g\u00e2y ung th\u01b0 da.<\/p>\n

\u0110a ph\u1ea7n tia UV b\u1ecb h\u1ea5p th\u1ee5 v\u00e0 b\u1ee9c x\u1ea1 ng\u01b0\u1ee3c l\u1ea1i b\u1edfi t\u1ea7ng ozon- n\u00f3 l\u00e0 ch\u1eafn c\u1ee7a tr\u00e1i \u0111\u1ea5t. Tuy v\u1eady ng\u00e0y nay m\u00f4i tr\u01b0\u1eddng ng\u00e0y c\u00e0ng b\u1ecb \u00f4 nhi\u1ec5m, c\u00f9ng v\u1edbi hi\u1ec7u \u1ee9ng nh\u00e0 k\u00ednh l\u00e0m l\u00e0m cho tr\u00e1i \u0111\u1ea5t n\u00f3ng l\u00ean t\u1eebng ng\u00e0y, t\u1ea7ng ozon b\u1ecb suy y\u1ebfu nghi\u00eam tr\u1ecdng. V\u00ec th\u1ebf ch\u00fang ta c\u1ea7n c\u00f3 nh\u1eefng hi\u1ec3u bi\u1ebft nh\u1ea5t \u0111\u1ecbnh v\u1ec1 tia UV v\u00e0 c\u00e1c t\u00e1c h\u1ea1i c\u1ee7a n\u00f3 \u0111\u00ea c\u00f3 \u0111\u01b0\u1ee3c bi\u1ec7n ph\u00e1p c\u1ea7n thi\u1ebft b\u1ea3o v\u1ec7 s\u1ee9c kh\u1ecfe cho b\u1ea3n th\u00e2n v\u00e0 m\u1ecdi ng\u01b0\u1eddi xung quanh.<\/p>\n

\"tia
tia UVA k\u1ebb gi\u1ebft ng\u01b0\u1eddi th\u1ea7m l\u1eb7ng<\/figcaption><\/figure>\n

UVA \u0111\u01b0\u1ee3c cho l\u00e0 “k\u1ebb gi\u1ebft ng\u01b0\u1eddi th\u1ea7m l\u1eb7ng”, M\u1ecdi ng\u01b0\u1eddi s\u1ebd kh\u00f4ng h\u1ec1 c\u1ea3m th\u1ea5y g\u00ec, nh\u01b0ng ch\u00fang v\u1eabn \u0111ang \u00e2m th\u1ea7m ph\u00e1 h\u1ee7y bi\u1ec3u b\u00ec da b\u1ea1n<\/p>\n

Tia UVA c\u00f3 kh\u1ea3 n\u0103ng xuy\u00ean qua k\u00ednh, b\u00ea t\u00f4ng nh\u01b0ng v\u1edbi UVB th\u00ec kh\u00f4ng. Hi\u1ec7n nay tr\u00ean t\u1ea5m k\u00ednh c\u1ee7a xe \u00f4 t\u00f4 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t ch\u1ed1ng tia UVA, c\u00e1ch ch\u1ed1ng tia UVA t\u1ed1t nh\u1ea5t hi\u1ec7n nay ch\u00ednh l\u00e0 ra d\u01b0\u1eddng n\u00ean b\u00f4i kem ch\u1ed1ng n\u1eafng.<\/p>\n

Tia UVB l\u00e0 g\u00ec?<\/h2>\n

Nh\u1eefng tia UVB c\u00f3 b\u01b0\u1edbc s\u00f3ng t\u1eeb 290 nm \u0111\u1ebfn 320 nm, n\u1eb1m trong pham vi nh\u1ecf h\u01a1n nhi\u1ec1u so v\u1edbi tia UVA. UVB d\u1eabn \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 ch\u00e1y n\u1eafng v\u00e0 nh\u1eefng thay \u0111\u1ed5i c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y ngay tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a da ti\u1ebfp x\u00fac v\u1edbi \u00e1nh n\u1eafng v\u00ec kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7. Tia UVB c\u1ee7ng nh\u01b0 UVA c\u1ee7ng g\u00f3p ph\u1ea7n l\u00e0m t\u0103ng kh\u1ea3 n\u0103ng ung th\u01b0 da.<\/p>\n

Kh\u00f4ng nh\u01b0 tia UVA, c\u01b0\u1eddng \u0111\u1ed9 tia UVB c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch kh\u00e1 r\u1ecf \u1edf th\u1eddi gian, v\u1ecb tr\u00ed \u0111\u1ecba l\u00fd v\u00e0 m\u00f9a kh\u00e1c nhau. Tai b\u00e1n c\u1ea7u B\u1eafc, c\u01b0\u1eddng \u0111\u1ed9 tia UVB l\u00e0 m\u1ea1nh nh\u1ea5t trong th\u1eddi gian t\u1eeb th\u00e1ng 4 \u0111\u1ebfn th\u00e1ng 10, khi \u0111\u00f3 ng\u00e0y d\u00e0i h\u01a1n, c\u01b0\u1eddng \u0111\u1ed9 \u0111\u1ea1t m\u1ee9c cao nh\u1ea5t v\u00e0o 10 gi\u1edd s\u00e1ng \u0111\u1ebfn 4 gi\u1edd chi\u1ec1u.<\/p>\n

\u0110\u1ec3 tr\u00e1nh tia UV l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u01a1 th\u1ec3 khi ra \u0111\u01b0\u1eddng b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1eaft k\u00ednh t\u1ed1t, s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i kh\u1ea9u trang ch\u1ed1ng tia UV, v\u00e0 \u0111\u1eb7c bi\u1ec7t h\u01a1n v\u1edbi da tr\u00ean c\u01a1 th\u1ec3, b\u1ea1n c\u1ea7n s\u1eed d\u1ee5ng c\u00e1c lo\u1ea1i kem ch\u1ed1ng n\u1eafng \u0111\u1eb7c bi\u1ec7t gi\u00fap b\u1ea3o v\u1ec7 \u0111\u00f4i m\u1eaft c\u1ee7a m\u00ecnh.<\/p>\n

\u0110\u1ec3 l\u1ef1a ch\u1ecdn m\u1eaft k\u00ednh t\u1ed1t d\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch ph\u00e2n bi\u1ec7t k\u00ednh t\u1ed1t<\/a><\/strong>\u00a0cho b\u1ea1n ch\u1ed1ng tia UV m\u1ed9t c\u00e1ch t\u1ed1t nh\u1ea5t<\/p>\n","protected":false},"excerpt":{"rendered":"

Tia UV hay \u0111\u01b0\u1ee3c g\u1ecdi v\u1edbi c\u00e1i t\u00ean kh\u00e1c l\u00e0 tia c\u1ef1c t\u00edm n\u00f3 c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1edbn l\u00ean c\u00f3 th\u1ec3 con ng\u01b0\u1eddi nh\u1ea5t l\u00e0 v\u00f9ng da. \u0110\u1eb7c bi\u1ec7t UV l\u00e0 nguy\u00ean nh\u00e2n s\u1ed1 m\u1ed9t g\u00e2y ung th\u01b0 da. C\u00f9ng b\u1eafc \u0111\u1ea9u t\u00ecm hi\u1ec3u v\u1ec1 t\u00e1c h\u1ea1i to l\u1edbn c\u1ee7a lo\u1ea1i tia \u0111\u1ed9c hai n\u00e0y nh\u00e9<\/p>\n","protected":false},"author":1,"featured_media":6287,"comment_status":"open","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"kbtopic":[764],"kbtag":[998],"_links":{"self":[{"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/kb\/6286"}],"collection":[{"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/kb"}],"about":[{"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/types\/kb"}],"author":[{"embeddable":true,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/comments?post=6286"}],"version-history":[{"count":0,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/kb\/6286\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/media\/6287"}],"wp:attachment":[{"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/media?parent=6286"}],"wp:term":[{"taxonomy":"kbtopic","embeddable":true,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/kbtopic?post=6286"},{"taxonomy":"kbtag","embeddable":true,"href":"https:\/\/bacdau.vn\/wp-json\/wp\/v2\/kbtag?post=6286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}