{"id":568805,"date":"2026-07-27T09:18:31","date_gmt":"2026-07-27T02:18:31","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=568805"},"modified":"2026-07-27T09:18:31","modified_gmt":"2026-07-27T02:18:31","slug":"tia-tu-ngoai-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/tia-tu-ngoai-la-gi\/","title":{"rendered":"Tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec? Ngu\u1ed3n ph\u00e1t, t\u00ednh ch\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng"},"content":{"rendered":"

Tia t\u1eed ngo\u1ea1i (tia UV) l\u00e0 b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn h\u01a1n \u00e1nh s\u00e1ng t\u00edm nh\u00ecn th\u1ea5y, n\u1eb1m trong kho\u1ea3ng kho\u1ea3ng 10 nm \u0111\u1ebfn 380 nm; m\u1eaft ng\u01b0\u1eddi kh\u00f4ng nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c tia t\u1eed ngo\u1ea1i. Ngu\u1ed3n ph\u00e1t tia t\u1eed ngo\u1ea1i l\u1edbn nh\u1ea5t l\u00e0 M\u1eb7t Tr\u1eddi. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c V\u1eadt l\u00fd l\u1edbp 12. B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y <\/span>tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec<\/b>, ngu\u1ed3n ph\u00e1t, t\u00ednh ch\u1ea5t, ph\u00e2n lo\u1ea1i UVA \u2013 UVB \u2013 UVC, \u1ee9ng d\u1ee5ng v\u00e0 l\u01b0u \u00fd b\u1ea3o v\u1ec7 s\u1ee9c kh\u1ecfe.<\/span><\/p>\n

Tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec?<\/b><\/h2>\n

Tia t\u1eed ngo\u1ea1i (c\u00f2n g\u1ecdi l\u00e0 tia c\u1ef1c t\u00edm, tia UV) l\u00e0 s\u00f3ng \u0111i\u1ec7n t\u1eeb c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn h\u01a1n b\u01b0\u1edbc s\u00f3ng c\u1ee7a \u00e1nh s\u00e1ng t\u00edm, n\u1eb1m gi\u1eefa \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y v\u00e0 tia X trong thang s\u00f3ng \u0111i\u1ec7n t\u1eeb. Do b\u01b0\u1edbc s\u00f3ng ng\u1eafn h\u01a1n \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y, tia t\u1eed ngo\u1ea1i mang n\u0103ng l\u01b0\u1ee3ng cao h\u01a1n v\u00e0 c\u00f3 nhi\u1ec1u t\u00e1c d\u1ee5ng \u0111\u1eb7c bi\u1ec7t. V\u00ec c\u00f9ng b\u1ea3n ch\u1ea5t l\u00e0 s\u00f3ng \u0111i\u1ec7n t\u1eeb, tia t\u1eed ngo\u1ea1i truy\u1ec1n trong ch\u00e2n kh\u00f4ng v\u1edbi t\u1ed1c \u0111\u1ed9 \u00e1nh s\u00e1ng v\u00e0 tu\u00e2n theo c\u00e1c \u0111\u1ecbnh lu\u1eadt ph\u1ea3n x\u1ea1, kh\u00fac x\u1ea1, giao thoa nh\u01b0 \u00e1nh s\u00e1ng th\u01b0\u1eddng.<\/span><\/p>\n

\"tia-tu-ngoai-la-gi-1\"<\/p>\n

Ngu\u1ed3n ph\u00e1t tia t\u1eed ngo\u1ea1i<\/b><\/h2>\n

Ngu\u1ed3n ph\u00e1t tia t\u1eed ngo\u1ea1i m\u1ea1nh nh\u1ea5t l\u00e0 M\u1eb7t Tr\u1eddi. Ngo\u00e0i ra, tia t\u1eed ngo\u1ea1i c\u00f2n \u0111\u01b0\u1ee3c ph\u00e1t ra t\u1eeb c\u00e1c v\u1eadt nung n\u00f3ng \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 r\u1ea5t cao (tr\u00ean 2.000\u00b0C), h\u1ed3 quang \u0111i\u1ec7n khi h\u00e0n, v\u00e0 c\u00e1c lo\u1ea1i \u0111\u00e8n \u0111\u1eb7c bi\u1ec7t nh\u01b0 \u0111\u00e8n h\u01a1i th\u1ee7y ng\u00e2n. Ph\u1ea7n l\u1edbn tia t\u1eed ngo\u1ea1i t\u1eeb M\u1eb7t Tr\u1eddi b\u1ecb t\u1ea7ng \u00f4z\u00f4n c\u1ee7a kh\u00ed quy\u1ec3n h\u1ea5p th\u1ee5, gi\u00fap b\u1ea3o v\u1ec7 sinh v\u1eadt tr\u00ean Tr\u00e1i \u0110\u1ea5t.<\/span><\/p>\n

M\u1ed9t \u0111i\u1ec3m c\u1ea7n l\u01b0u \u00fd: nhi\u1ec7t \u0111\u1ed9 v\u1eadt ph\u00e1t s\u00e1ng c\u00e0ng cao th\u00ec t\u1ec9 l\u1ec7 tia t\u1eed ngo\u1ea1i trong b\u1ee9c x\u1ea1 ph\u00e1t ra c\u00e0ng l\u1edbn. \u0110\u00f3 l\u00e0 l\u00fd do h\u1ed3 quang \u0111i\u1ec7n khi h\u00e0n (nhi\u1ec7t \u0111\u1ed9 r\u1ea5t cao) ph\u00e1t ra nhi\u1ec1u tia t\u1eed ngo\u1ea1i \u0111\u1ebfn m\u1ee9c ng\u01b0\u1eddi th\u1ee3 h\u00e0n ph\u1ea3i d\u00f9ng m\u1eb7t n\u1ea1 che ch\u1eafn \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1eaft v\u00e0 da.<\/span><\/p>\n

T\u00ednh ch\u1ea5t c\u1ee7a tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec<\/b><\/h2>\n

Tia t\u1eed ngo\u1ea1i (tia UV) c\u00f3 nhi\u1ec1u t\u00ednh ch\u1ea5t quan tr\u1ecdng:<\/span><\/p>\n

    \n
  • T\u00e1c d\u1ee5ng l\u00ean k\u00ednh \u1ea3nh: L\u00e0m \u0111en phim \u1ea3nh do kh\u1ea3 n\u0103ng t\u00e1c \u0111\u1ed9ng l\u00ean c\u00e1c ch\u1ea5t nh\u1ea1y s\u00e1ng.<\/span><\/li>\n
  • G\u00e2y hi\u1ec7n t\u01b0\u1ee3ng ph\u00e1t quang: L\u00e0m m\u1ed9t s\u1ed1 ch\u1ea5t ph\u00e1t ra \u00e1nh s\u00e1ng khi b\u1ecb chi\u1ebfu tia t\u1eed ngo\u1ea1i.<\/span><\/li>\n
  • G\u00e2y ion h\u00f3a v\u00e0 x\u1ea3y ra c\u00e1c ph\u1ea3n \u1ee9ng quang h\u00f3a: C\u00f3 kh\u1ea3 n\u0103ng l\u00e0m bi\u1ebfn \u0111\u1ed5i c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t s\u1ed1 ch\u1ea5t khi h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng t\u1eeb tia t\u1eed ngo\u1ea1i.<\/span><\/li>\n
  • C\u00f3 t\u00e1c d\u1ee5ng sinh h\u1ecdc m\u1ea1nh: C\u00f3 kh\u1ea3 n\u0103ng di\u1ec7t khu\u1ea9n, \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng trong kh\u1eed tr\u00f9ng; tuy nhi\u00ean, n\u1ebfu ti\u1ebfp x\u00fac qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 g\u00e2y t\u1ed5n th\u01b0\u01a1ng cho da v\u00e0 m\u1eaft.<\/span><\/li>\n
  • Kh\u1ea3 n\u0103ng truy\u1ec1n qua v\u1eadt li\u1ec7u: B\u1ecb th\u1ee7y tinh th\u00f4ng th\u01b0\u1eddng h\u1ea5p th\u1ee5 m\u1ea1nh, nh\u01b0ng c\u00f3 th\u1ec3 truy\u1ec1n qua th\u1ea1ch anh. V\u00ec v\u1eady c\u00e1c th\u1ea5u k\u00ednh, l\u0103ng k\u00ednh d\u00f9ng cho tia t\u1eed ngo\u1ea1i th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng th\u1ea1ch anh thay cho th\u1ee7y tinh.<\/span><\/li>\n<\/ul>\n

    \"tia-tu-ngoai-la-gi-2\"<\/p>\n

    Ph\u00e2n lo\u1ea1i tia t\u1eed ngo\u1ea1i<\/b><\/h2>\n

    Tia t\u1eed ngo\u1ea1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i d\u1ef1a tr\u00ean b\u01b0\u1edbc s\u00f3ng, m\u1ed7i lo\u1ea1i c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 m\u1ee9c \u0111\u1ed9 t\u00e1c \u0111\u1ed9ng kh\u00e1c nhau. Vi\u1ec7c t\u00ecm hi\u1ec3u s\u1ef1 ph\u00e2n chia n\u00e0y gi\u00fap l\u00e0m r\u00f5 t\u00ednh ch\u1ea5t, kh\u1ea3 n\u0103ng xuy\u00ean qua v\u1eadt ch\u1ea5t c\u0169ng nh\u01b0 nh\u1eefng \u1ee9ng d\u1ee5ng c\u1ee7a tia t\u1eed ngo\u1ea1i trong \u0111\u1eddi s\u1ed1ng v\u00e0 khoa h\u1ecdc.<\/span><\/p>\n\n\n\n\n\n\n\n
    Lo\u1ea1i<\/b><\/td>\nKho\u1ea3ng b\u01b0\u1edbc s\u00f3ng<\/b><\/td>\n\u0110\u1eb7c \u0111i\u1ec3m<\/b><\/td>\n<\/tr>\n<\/thead>\n
    UVA<\/span><\/td>\n315 \u2013 400 nm<\/span><\/td>\nB\u01b0\u1edbc s\u00f3ng d\u00e0i nh\u1ea5t, xuy\u00ean s\u00e2u v\u00e0o da, g\u00e2y l\u00e3o h\u00f3a da<\/span><\/td>\n<\/tr>\n
    UVB<\/span><\/td>\n280 \u2013 315 nm<\/span><\/td>\nB\u01b0\u1edbc s\u00f3ng trung b\u00ecnh, g\u00e2y ch\u00e1y n\u1eafng, k\u00edch th\u00edch t\u1ed5ng h\u1ee3p vitamin D<\/span><\/td>\n<\/tr>\n
    UVC<\/span><\/td>\n100 \u2013 280 nm<\/span><\/td>\nB\u01b0\u1edbc s\u00f3ng ng\u1eafn nh\u1ea5t, n\u0103ng l\u01b0\u1ee3ng cao, ph\u1ea7n l\u1edbn b\u1ecb t\u1ea7ng \u00f4z\u00f4n ch\u1eb7n l\u1ea1i<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Nh\u00ecn v\u00e0o b\u1ea3ng c\u00f3 th\u1ec3 th\u1ea5y b\u01b0\u1edbc s\u00f3ng c\u00e0ng ng\u1eafn th\u00ec n\u0103ng l\u01b0\u1ee3ng c\u00e0ng cao v\u00e0 m\u1ee9c \u0111\u1ed9 nguy hi\u1ec3m c\u00e0ng l\u1edbn. May m\u1eafn l\u00e0 t\u1ea7ng \u00f4z\u00f4n v\u00e0 kh\u00ed quy\u1ec3n \u0111\u00e3 ch\u1eb7n g\u1ea7n nh\u01b0 to\u00e0n b\u1ed9 UVC v\u00e0 m\u1ed9t ph\u1ea7n l\u1edbn UVB, n\u00ean ph\u1ea7n tia t\u1eed ngo\u1ea1i \u0111\u1ebfn \u0111\u01b0\u1ee3c m\u1eb7t \u0111\u1ea5t ch\u1ee7 y\u1ebfu l\u00e0 UVA c\u00f9ng m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf UVB.<\/span><\/p>\n

    \u1ee8ng d\u1ee5ng c\u1ee7a tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec<\/b><\/h2>\n

    Tia t\u1eed ngo\u1ea1i c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng h\u1eefu \u00edch: kh\u1eed tr\u00f9ng, di\u1ec7t khu\u1ea9n d\u1ee5ng c\u1ee5 y t\u1ebf, n\u01b0\u1edbc v\u00e0 kh\u00f4ng kh\u00ed; k\u00edch th\u00edch c\u01a1 th\u1ec3 t\u1ed5ng h\u1ee3p vitamin D (t\u1eafm n\u1eafng bu\u1ed5i s\u00e1ng s\u1edbm h\u1ee3p l\u00fd); ph\u00e1t hi\u1ec7n ti\u1ec1n gi\u1ea3, v\u1ebft n\u1ee9t tr\u00ean b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u (nh\u1edd hi\u1ec7n t\u01b0\u1ee3ng ph\u00e1t quang); v\u00e0 \u1ee9ng d\u1ee5ng trong m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb ph\u00e2n t\u00edch. Trong c\u00f4ng nghi\u1ec7p, tia t\u1eed ngo\u1ea1i c\u00f2n d\u00f9ng \u0111\u1ec3 l\u00e0m kh\u00f4 m\u1ef1c in, s\u01a1n nhanh.<\/span><\/p>\n

    Trong y h\u1ecdc, \u0111\u00e8n UVC \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ti\u1ec7t tr\u00f9ng ph\u00f2ng m\u1ed5 v\u00e0 d\u1ee5ng c\u1ee5. Trong ki\u1ec3m tra ch\u1ea5t l\u01b0\u1ee3ng, ng\u01b0\u1eddi ta chi\u1ebfu tia t\u1eed ngo\u1ea1i l\u00ean chi ti\u1ebft kim lo\u1ea1i: nh\u1eefng v\u1ebft n\u1ee9t li ti s\u1ebd hi\u1ec7n r\u00f5 nh\u1edd ch\u1ea5t ph\u00e1t quang th\u1ea5m v\u00e0o khe n\u1ee9t. Tr\u00ean ti\u1ec1n gi\u1ea5y v\u00e0 gi\u1ea5y t\u1edd t\u00f9y th\u00e2n c\u0169ng in c\u00e1c h\u00ecnh \u1ea9n ch\u1ec9 hi\u1ec7n l\u00ean d\u01b0\u1edbi \u00e1nh \u0111\u00e8n UV, gi\u00fap ph\u00e2n bi\u1ec7t th\u1eadt \u2013 gi\u1ea3.<\/span><\/p>\n

    \"tia-tu-ngoai-la-gi-3\"<\/p>\n

    Ph\u00e2n bi\u1ec7t tia t\u1eed ngo\u1ea1i v\u1edbi tia h\u1ed3ng ngo\u1ea1i v\u00e0 tia X<\/b><\/h2>\n

    Trong thang s\u00f3ng \u0111i\u1ec7n t\u1eeb, c\u00e1c b\u1ee9c x\u1ea1 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo b\u01b0\u1edbc s\u00f3ng. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y gi\u00fap b\u1ea1n ph\u00e2n bi\u1ec7t tia t\u1eed ngo\u1ea1i v\u1edbi hai b\u1ee9c x\u1ea1 th\u01b0\u1eddng g\u1eb7p b\u00ean c\u1ea1nh n\u00f3 l\u00e0 tia h\u1ed3ng ngo\u1ea1i v\u00e0 tia X.<\/span><\/p>\n\n\n\n\n\n\n\n
    Lo\u1ea1i b\u1ee9c x\u1ea1<\/b><\/td>\nV\u1ecb tr\u00ed b\u01b0\u1edbc s\u00f3ng<\/b><\/td>\n\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/b><\/td>\n<\/tr>\n<\/thead>\n
    Tia h\u1ed3ng ngo\u1ea1i<\/span><\/td>\nD\u00e0i h\u01a1n \u00e1nh s\u00e1ng \u0111\u1ecf<\/span><\/td>\nB\u01b0\u1edbc s\u00f3ng d\u00e0i, n\u0103ng l\u01b0\u1ee3ng th\u1ea5p, t\u00e1c d\u1ee5ng nhi\u1ec7t m\u1ea1nh<\/span><\/td>\n<\/tr>\n
    Tia t\u1eed ngo\u1ea1i<\/span><\/td>\nNg\u1eafn h\u01a1n \u00e1nh s\u00e1ng t\u00edm<\/span><\/td>\nN\u0103ng l\u01b0\u1ee3ng cao h\u01a1n \u00e1nh s\u00e1ng th\u1ea5y, t\u00e1c d\u1ee5ng sinh h\u1ecdc, h\u00f3a h\u1ecdc m\u1ea1nh<\/span><\/td>\n<\/tr>\n
    Tia X<\/span><\/td>\nNg\u1eafn h\u01a1n tia t\u1eed ngo\u1ea1i<\/span><\/td>\nN\u0103ng l\u01b0\u1ee3ng r\u1ea5t cao, \u0111\u00e2m xuy\u00ean m\u1ea1nh qua nhi\u1ec1u v\u1eadt li\u1ec7u<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    L\u01b0u \u00fd b\u1ea3o v\u1ec7 s\u1ee9c kh\u1ecfe<\/b><\/h2>\n

    Ti\u1ebfp x\u00fac qu\u00e1 nhi\u1ec1u v\u1edbi tia t\u1eed ngo\u1ea1i (\u0111\u1eb7c bi\u1ec7t UVB, UVA) c\u00f3 th\u1ec3 g\u00e2y ch\u00e1y n\u1eafng, l\u00e3o h\u00f3a da, t\u1ed5n th\u01b0\u01a1ng m\u1eaft v\u00e0 t\u0103ng nguy c\u01a1 m\u1eafc b\u1ec7nh v\u1ec1 da. V\u00ec v\u1eady, khi ra n\u1eafng gay g\u1eaft n\u00ean che ch\u1eafn, d\u00f9ng kem ch\u1ed1ng n\u1eafng, \u0111eo k\u00ednh r\u00e2m v\u00e0 h\u1ea1n ch\u1ebf ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp v\u00e0o gi\u1edd n\u1eafng cao \u0111i\u1ec3m. \u0110\u00e2y l\u00e0 nh\u1eefng khuy\u1ebfn c\u00e1o chung; n\u1ebfu c\u00f3 v\u1ea5n \u0111\u1ec1 v\u1ec1 da hay m\u1eaft, b\u1ea1n n\u00ean tham kh\u1ea3o \u00fd ki\u1ebfn b\u00e1c s\u0129.<\/span><\/p>\n

    B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/b><\/h2>\n

    B\u00e0i 1: Tia t\u1eed ngo\u1ea1i c\u00f3 b\u01b0\u1edbc s\u00f3ng so v\u1edbi \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y th\u1ebf n\u00e0o? L\u1eddi gi\u1ea3i: ng\u1eafn h\u01a1n b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng t\u00edm, n\u00ean n\u0103ng l\u01b0\u1ee3ng cao h\u01a1n.<\/span><\/p>\n

    B\u00e0i 2: V\u00ec sao tia t\u1eed ngo\u1ea1i \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 kh\u1eed tr\u00f9ng? L\u1eddi gi\u1ea3i: v\u00ec tia t\u1eed ngo\u1ea1i c\u00f3 t\u00e1c d\u1ee5ng sinh h\u1ecdc m\u1ea1nh, ti\u00eau di\u1ec7t \u0111\u01b0\u1ee3c vi khu\u1ea9n.<\/span><\/p>\n

    B\u00e0i 3: S\u1eafp x\u1ebfp theo b\u01b0\u1edbc s\u00f3ng gi\u1ea3m d\u1ea7n: \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y, tia t\u1eed ngo\u1ea1i, tia X. L\u1eddi gi\u1ea3i: \u00e1nh s\u00e1ng nh\u00ecn th\u1ea5y > tia t\u1eed ngo\u1ea1i > tia X.<\/span><\/p>\n

    B\u00e0i 4 (tr\u1eafc nghi\u1ec7m): Ngu\u1ed3n ph\u00e1t tia t\u1eed ngo\u1ea1i m\u1ea1nh nh\u1ea5t trong t\u1ef1 nhi\u00ean l\u00e0 g\u00ec? A. B\u00f3ng \u0111\u00e8n s\u1ee3i \u0111\u1ed1t B. M\u1eb7t Tr\u1eddi C. Ng\u1ecdn n\u1ebfn D. M\u1eb7t Tr\u0103ng. \u0110\u00e1p \u00e1n: B.<\/span><\/p>\n

    B\u00e0i 5: V\u00ec sao l\u0103ng k\u00ednh d\u00f9ng cho tia t\u1eed ngo\u1ea1i th\u01b0\u1eddng l\u00e0m b\u1eb1ng th\u1ea1ch anh ch\u1ee9 kh\u00f4ng ph\u1ea3i th\u1ee7y tinh? L\u1eddi gi\u1ea3i: v\u00ec th\u1ee7y tinh th\u00f4ng th\u01b0\u1eddng h\u1ea5p th\u1ee5 m\u1ea1nh tia t\u1eed ngo\u1ea1i, c\u00f2n th\u1ea1ch anh cho tia t\u1eed ngo\u1ea1i truy\u1ec1n qua t\u1ed1t n\u00ean ph\u00f9 h\u1ee3p h\u01a1n.<\/span><\/p>\n

    \"tia-tu-ngoai-la-gi-4\"<\/p>\n

    C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 tia t\u1eed ngo\u1ea1i<\/b><\/h2>\n

    Tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec?<\/b><\/h3>\n

    L\u00e0 b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn h\u01a1n \u00e1nh s\u00e1ng t\u00edm, m\u1eaft ng\u01b0\u1eddi kh\u00f4ng nh\u00ecn th\u1ea5y.<\/span><\/p>\n

    Ngu\u1ed3n ph\u00e1t tia t\u1eed ngo\u1ea1i l\u00e0 g\u00ec?<\/b><\/h3>\n

    Ch\u1ee7 y\u1ebfu l\u00e0 M\u1eb7t Tr\u1eddi, ngo\u00e0i ra c\u00f3 h\u1ed3 quang \u0111i\u1ec7n, \u0111\u00e8n h\u01a1i th\u1ee7y ng\u00e2n v\u00e0 c\u00e1c v\u1eadt nung n\u00f3ng tr\u00ean 2.000\u00b0C.<\/span><\/p>\n

    Tia t\u1eed ngo\u1ea1i c\u00f3 m\u1ea5y lo\u1ea1i?<\/b><\/h3>\n

    Ba lo\u1ea1i theo b\u01b0\u1edbc s\u00f3ng: UVA, UVB v\u00e0 UVC.<\/span><\/p>\n

    Tia t\u1eed ngo\u1ea1i c\u00f3 \u1ee9ng d\u1ee5ng g\u00ec?<\/b><\/h3>\n

    Kh\u1eed tr\u00f9ng, di\u1ec7t khu\u1ea9n, t\u1ed5ng h\u1ee3p vitamin D, ph\u00e1t hi\u1ec7n ti\u1ec1n gi\u1ea3 v\u00e0 v\u1ebft n\u1ee9t v\u1eadt li\u1ec7u.<\/span><\/p>\n

    Tia t\u1eed ngo\u1ea1i c\u00f3 h\u1ea1i kh\u00f4ng?<\/b><\/h3>\n

    Ti\u1ebfp x\u00fac qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 g\u00e2y h\u1ea1i cho da v\u00e0 m\u1eaft, n\u00ean c\u1ea7n che ch\u1eafn khi ra n\u1eafng.<\/span><\/p>\n

    V\u00ec sao tia t\u1eed ngo\u1ea1i truy\u1ec1n qua \u0111\u01b0\u1ee3c th\u1ea1ch anh m\u00e0 kh\u00f4ng qua th\u1ee7y tinh?<\/b><\/h3>\n

    V\u00ec th\u1ee7y tinh th\u00f4ng th\u01b0\u1eddng h\u1ea5p th\u1ee5 m\u1ea1nh tia t\u1eed ngo\u1ea1i, c\u00f2n th\u1ea1ch anh cho tia t\u1eed ngo\u1ea1i truy\u1ec1n qua t\u1ed1t.<\/span><\/p>\n