Imisebe yeGamma Ray (γ)
I-Pengantar
Imisebe ye-Gamma (γ) iwuhlobo lwemisebe kagesi enamandla aphezulu kanye nobude besikhathi obufushane kakhulu. Yatholwa yisazi sesayensi yezinkanyezi saseFrance uPaul Villard ngo-1900, le misebe ingena kakhulu. Lezi zakhiwo zivumela ukuthi zisetshenziswe ezinhlobonhlobo zezicelo, kusukela kwezokwelapha kuya kwisayensi, kodwa futhi zibeka izingozi ezinkulu ngenxa yokuthi zingalimaza izicubu zezinto eziphilayo. Kulesi sihloko, sizohlola izakhiwo zomzimba zemisebe ye-gamma, ukuthi yakheka kanjani, ukusetshenziswa kwayo, kanye nemiphumela yezempilo yale misebe.
Izakhiwo Ezibonakalayo Zemisebe Ye-Gamma
Imisebe ye-gamma iphezulu kakhulu ku-spectrum ye-electromagnetic, inemvamisa ephezulu kakhulu (engaphezu kuka-10^19 Hz) kanye nama-wavelength amafushane kakhulu (ngaphansi kwama-picometer ayi-10). Ngenxa yalezi zakhiwo, imisebe ye-gamma inamandla aphezulu kakhulu, kusukela kuma-kiloelectronvolts ambalwa (keV) kuya kuma-megaelectronvolts amaningana (MeV).
Amandla azo okungena makhulu kakhulu kunezinye izinhlobo zemisebe, njenge-X-ray noma imisebe ye-ultraviolet. Imisebe ye-gamma ngokuvamile ayimuncwa kalula yizinto ezivamile futhi idinga izinto eziqinile noma eziqinile kakhulu, njenge-lead noma ukhonkolo, ukuze ziyivimbe noma ziyihlunge ngempumelelo.
Ukwakheka Kwemisebe Yegamma
Imisebe ye-gamma ivame ukukhiqizwa ngesikhathi sokubola kwe-nuclide ethile ngemisebe, lapho i-nucleus ye-athomu engazinzile izama ukufinyelela esimweni samandla esiphansi nesizinzile. La ma-nuclei abolayo angaba yizakhi ezahlukahlukene, okuhlanganisa i-uranium, i-cobalt, noma i-cesium.
Ngaphandle kokubola kwemisebe, imisebe ye-gamma ingakhiqizwa ngezinqubo ezahlukahlukene endaweni yonke njengokusabela kwe-nuclear fusion ezinkanyezini, ukuqhuma kwe-supernova, noma izinhlayiya ezishaje kakhulu ezisebenzisana namasimu kazibuthe nezinto ezisemkhathini.
Izinhlelo Zokusebenzisa Imisebe Ye-Gamma
Ezokwelapha
Enye yezindlela ezisetshenziswa kakhulu zemisebe ye-gamma isemithini, ikakhulukazi ekwelashweni ngemisebe yokwelapha umdlavuza. Ngenxa yokuthi imisebe ye-gamma inamandla amakhulu futhi ingangena kalula ezicutshini zomzimba, ingaqondiswa ezimilaneni ukuze ibhubhise amangqamuzana omdlavuza ngaphandle kwesidingo sokuhlinzwa. Le ndlela yaziwa ngokuthi ukwelashwa ngemisebe yangaphandle.
Ekuxilongeni, imisebe ye-gamma isetshenziswa kumasu okuthwebula izithombe njenge-Positron Emission Tomography (PET) scans. I-PET scans isebenzisa ama-isotopes anemisebe akhiqiza imisebe ye-gamma njengoba ibola ukuze ibone umsebenzi we-metabolic kanye nezinguquko emzimbeni ezingase zibonise isifo noma ukukhubazeka.
Umkhakha
Embonini, imisebe ye-gamma ivame ukusetshenziswa kwi-radiography yezimboni. Lokhu kuhilela ukusebenzisa imisebe ye-gamma ukuhlola ubuqotho kanye nekhwalithi yezakhiwo zezinto ezifana namapayipi, izindiza, kanye nemishini. Le ndlela ivumela ukuhlonza amaphutha noma umonakalo ezintweni ngaphandle kwesidingo sokuzihlukanisa.
Amandla neSayensi
Ocwaningweni lwesayensi, imisebe ye-gamma isetshenziswa ukutadisha ukwakheka kwezinto ngokusebenzisa amasu anjenge-gamma spectroscopy. Le ndlela iwusizo emikhakheni efana nokuvubukula, i-geophysics, kanye nokutadisha amakhemikhali anamandla aphezulu.
Umthelela Wezempilo
Njengemisebe ye-ionizing, imisebe ye-gamma inekhono lokwenza ama-molecule nama-athomu abe yi-ionizing ngaphakathi kwamangqamuzana omzimba, okungabangela umonakalo omkhulu noma obulalayo ezicutshini zezinto eziphilayo. Imiphumela yezempilo yokuchayeka kwemisebe ye-gamma incike kumthamo kanye nobude bokuvezwa. Imithamo ephansi esikhathini esifushane ingase ingabangeli imiphumela ebonakalayo ngokushesha, kodwa imithamo ephezulu noma ukuvezwa isikhathi eside kungadala imiphumela emibi njengokugula kwemisebe noma ngisho nomdlavuza.
Imiphumela Ebuhlungu
Ukuchayeka ngokushesha emisebeni ye-gamma ephezulu kakhulu kungabangela i-acute radiation syndrome (ARS). Izimpawu zingasukela ekucasukeni, ekuhlanzeni, nasekuhudeni kuya ekulimaleni kwezitho zangaphakathi kanye nokufa, kuye ngezinga lokuchayeka.
Imiphumela Engapheli
Ukuchayeka isikhathi eside emisebeni ye-gamma ephansi nakho kuyingozi kakhulu. Lokhu kuchayeka kungandisa ingozi yomdlavuza, ukungazali, kanye nomonakalo wezakhi zofuzo ongabonakala ezizukulwaneni ezizayo.
Ukuvikelwa Emisebeni Ye-Gamma Ray
Ukunciphisa ingozi yokuchayeka emisebeni ye-gamma kudinga izinyathelo zokuphepha ezingathi sína. Ezindaweni zomsebenzi ezinobungozi obukhulu, ukusetshenziswa kwemishini yokuzivikela yomuntu siqu (i-PPE) njengezingubo ezikhethekile, izivikelo zokuvikela i-lead, kanye nezivikelo zomsebe kunconywa kakhulu. Ulwazi lwebanga elisebenzayo, isikhathi, kanye nokuvikela kudlala indima ebalulekile ekunciphiseni ukuchayeka.
Ukulinganisa Nokuthola
Imisebe ye-gamma ingalinganiswa futhi itholakale kusetshenziswa amathuluzi ahlukahlukene, njenge-Geiger-Muller detectors, ama-scintillation counters, kanye ne-gamma spectrometers. Lawa mathuluzi asiza ekuqapheni amazinga emisebe emvelweni, ukuqinisekisa ukuphepha kanye nokuhambisana nezindinganiso ezimisiwe.
Isitholi seGeiger-Muller
Lesi sitholi sivame ukusetshenziselwa ukuthola imisebe ye-ionizing, okuhlanganisa nemisebe ye-gamma. Ngokusekelwe ekufakweni kwegesi kwishubhu lesitholi, le divayisi inikeza ukufundwa okunembile kobukhulu bemisebe endaweni ethile.
Izibali ze-Scintillation
Leli thuluzi lisebenzisa into ekhipha ukukhanya, noma "i-scintillator," ekhiqiza ukukhanya lapho ivezwa emisebeni ye-gamma. Lokhu kukhanya kube sekuguqulwa kube isignali kagesi elinganiswayo. Izibali ze-scintillation zinozwela oluphezulu futhi ziyakwazi ukubona amazinga aphansi emisebeni.
Isiphetho
Imisebe ye-gamma iyithuluzi eliwusizo emikhakheni eyahlukene njengezokwelapha, imboni, kanye nocwaningo lwesayensi ngenxa yekhono layo lokungena ezintweni ngamandla aphezulu. Kodwa-ke, izakhiwo eziyingozi zemisebe ye-gamma zenza nokuchayeka kulo msebe kube yingozi enkulu empilweni yabantu. Ngakho-ke, ukuqonda kahle izakhiwo zomzimba, ukwakheka, ukusetshenziswa, kanye nemiphumela yempilo yemisebe ye-gamma kubalulekile. Izinyathelo zokuzivikela ezifanele kanye nokuqapha okuqhubekayo kuyadingeka ukuze kuncishiswe izingozi futhi kwandiswe izinzuzo zemisebe ye-gamma.
