Zitsanzo za Mafunso Okhudza Tinthu Tomwe Timayatsa Ma radiation
Kutulutsa mphamvu m'thupi ndi chinthu chomwe chimachitika chifukwa cha kutulutsa mphamvu m'njira ya tinthu tating'onoting'ono kapena mafunde. Chinthuchi chimapezeka paliponse, kuyambira kudzuwa lomwe limatentha dziko lapansi mpaka kugwiritsa ntchito ukadaulo wa nyukiliya mozama kwambiri. Kukambirana za tinthu tating'onoting'ono tomwe timayatsidwa ndi kuwala n'kofunika osati mu fizikisi yokha komanso m'magawo azaumoyo ndi chilengedwe. Nkhaniyi ikambirana zitsanzo zingapo za mavuto ndi zokambirana zokhudzana ndi tinthu tating'onoting'ono tomwe timayatsidwa ndi kuwala kuti tithandize kumvetsetsa nkhaniyi.
Chiyambi cha Radiation
Tisanafufuze mavuto a zitsanzo, ndikofunikira kumvetsetsa zoyambira za tinthu ta radiation. Radiation ingagawidwe m'magulu awiri akuluakulu: radiation ya ionizing ndi radiation yosapanga ionizing. Radiation ya ionizing ili ndi mphamvu zokwanira kuti ionizing maatomu, kutanthauza kuwonjezera kapena kuchotsa ma elekitironi kuchokera ku maatomu kapena mamolekyu, ndipo imaphatikizapo mitundu ya radiation monga alpha, beta, ndi gamma rays. Koma radiation yosapanga ionizing ili ndi mphamvu zosakwanira kuti ionizing maatomu koma ingayambitse kutentha, monga ma microwave ndi mafunde a wailesi.
Kuwala kwa Alpha
Ma radiation a Alpha ndi tinthu tomwe timapangidwa ndi ma proton awiri ndi ma neutroni awiri (helium nuclei). Chifukwa tinthu ta alpha tili ndi mphamvu yabwino komanso yayikulu, tili ndi mphamvu yochepa yolowera ndipo tingayimitsidwe ndi pepala kapena khungu la munthu.
Chitsanzo cha Funso 1
Funso: Gwero la alpha radiation limadziwika kuti limatulutsa mphamvu ya 4 MeV. Ngati tinthu ta alpha tagunda pepala lokhala ndi makulidwe a 0,01 mm ndipo layamwa kwathunthu, kodi pepalalo limayamwa mphamvu zingati?
Kukambirana: Popeza tinthu ta alpha sitingalowe m'pepala lopyapyala, mphamvu zonse zochokera ku tinthu ta alpha zidzatengedwa ndi pepalalo. Chifukwa chake, mphamvu yomwe imatengedwa ndi yofanana ndi mphamvu yomwe imachokera, yomwe ndi 4 MeV.
Beta Radiation
Ma radiation a Beta amakhala ndi ma elekitironi othamanga kwambiri (beta minus) kapena ma positron (beta plus). Tinthu ta beta tili ndi mphamvu yolowera kwambiri kuposa tinthu ta alpha, koma tikhoza kuyimitsidwa ndi mamilimita ochepa a zinthu zokhuthala, monga aluminiyamu.
Chitsanzo cha Funso 2
Funso: Gwero la ma radiation a beta limatulutsa tinthu tating'onoting'ono tokhala ndi mphamvu ya 1 MeV. Ngati tinthu tating'onoting'onoti tagunda mbale ya aluminiyamu yokhuthala ya 2 mm, dziwani ngati tinthu ta beta tingalowe m'zinthuzo.
Kukambirana: Kawirikawiri, tinthu ta beta tomwe tili ndi mphamvu ya 1 MeV tingalowe mu mbale ya aluminiyamu yokwana 1-2 mm. Chifukwa chake, pankhaniyi, makulidwe a mbale ya aluminiyamu ndi okwanira kutsekereza tinthu ta beta tomwe tili ndi mphamvu. Zina zingalowe, koma mphamvu zawo zidzachepa mokwanira kotero kuti mphamvu zawo sizingachepe.
Kuwala kwa Gamma
Ma radiation a Gamma ndi ma radiation amagetsi ofanana ndi kuwala kapena ma X-ray, koma ndi mphamvu zambiri. Ma radiation awa ali ndi mphamvu yolowera kwambiri ndipo amatha kulowa muzinthu zokhuthala, koma mphamvu yake ingachepe pogwiritsa ntchito zinthu zokhuthala kwambiri, monga lead kapena konkriti.
Chitsanzo cha Funso 3
Funso: Gwero la gamma limatulutsa ma photon a gamma okhala ndi mphamvu ya 0,5 MeV. Kodi lead ndi yokhuthala bwanji yomwe imafunika kuti ichepetse mphamvu ya radiation pakati?
Kukambirana: Kuchepa kwa mphamvu ya kuwala kwa gamma kumatsimikiziridwa ndi lamulo la exponential, lomwe limafotokozedwa ngati \(I = I_0 e^{-\mu x}\), pomwe \(I\) ndiye mphamvu yotsala ya kuwala, \(I_0\) ndiye mphamvu yoyambirira, \(\mu\) ndiye coefficient ya attenuation ya chinthucho, ndipo \(x\) ndiye makulidwe a chinthucho.
Pa mphamvu ya gamma yokhala ndi mphamvu ya 0,5 MeV, mtengo wa \(\mu\) wa lead ndi pafupifupi 1,5 cm\(^{-1}\). Timapeza \(x\) pamene \(I = \frac{1}{2}I_0\):
\[ \frac{1}{2} = e^{-1,5x} \]
\[ \ln{\frac{1}{2}} = -1,5x \]
\[ x \pafupifupi \frac{-\ln{\frac{1}{2}}}{1,5} \pafupifupi \frac{0,693}{1,5} \pafupifupi 0,462 \malemba{ cm} \]
Kotero, zimatengera pafupifupi 0,46 cm ya lead kuti muchepetse mphamvu ya gamma ray ndi theka.
Zotsatira ndi Mapeto
Kumvetsetsa makhalidwe a tinthu tating'onoting'ono ta ma radiation ndi momwe timagwirira ntchito ndi zinthu zosiyanasiyana ndikofunikira kwambiri pakugwiritsa ntchito ukadaulo wa nyukiliya, thanzi, komanso chitetezo. Kukambirana za mavutowa sikuti kumangopereka chithunzithunzi cha momwe mfundo zoyambira zimagwiritsidwira ntchito komanso kukuwonetsa kufunika koteteza ma radiation pazochitika zosiyanasiyana.
Chidziwitsochi chingakhale chida chofunikira kwambiri kwa asayansi, mainjiniya, ndi akatswiri azaumoyo pochita kuwunika zoopsa, kupanga zotchingira ma radiation, ndikuwonetsetsa kuti ukadaulo wokhudzana ndi ma radiation ndi wotetezeka. Kuphatikiza apo, kuphunzitsa anthu za zoopsa za ma radiation ndi kuchepetsa vutoli ndikofunikira kwambiri kuti muchepetse zoopsa zomwe zingachitike kwa anthu ammudzi. Mukamvetsetsa bwino, ubwino wa ukadaulo wa ma radiation ukhoza kukulitsidwa kwambiri pamene muchepetsa zotsatira zake zoyipa.
