File:Gammakiirgus.JPG
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[edit]DescriptionGammakiirgus.JPG |
Eesti: Kui ohtlik on radioaktiivne kiirgus? Radioaktiivse kiirguse üheks kõige ohtlikumaks komponendiks on kõrge energiaga gammakiirgus. Tema ohtlikkus elusorganismidele on tingitud suure läbimisvõime ja ioniseeriva toime koosmõjust – nimelt tungib kiirgus kergesti läbi bioloogilise materjali ning tekitab kogu kiiritatud ala ulatuses sisemisi kahjustusi. Selleks, et demonstreerida üliõpilastele ja teistele huvilistele gammakiirguse läbitungivat võimet, pandi kokku katseseade, mis koosnes Geigeri loendurist ja radioaktiivsest allikast (Co), mille vahele asetati erinevaid materjale. Kuna inimest ei tahetud sinna vahele asetada, siis kasutati võimalikult inimesele sarnanevat materjali – pihvid. Katse näitas, et enamus kiirgusest tuli kolmest pihvist üsna edukalt läbi kuid vähene kadu viitab sellele, et osa kiirgust oli uuritava materjaliga interakteerunud ning sisemisi kahjustusi tekitanud! Uuritud sai ka seda kui hästi radioaktiivse allika hoidmiseks kasutatav paks plii korpus gammakiirgust neelab. Katses selgus et korpus võiks veelgi paksem olla et end selle lähedal turvaliselt tunda. Samas olid katsed siiski üsna ohutud, sest antud kiirgusallikast tuleneva gammakiirguse tase oli vaid 5 korda kõrgem looduslikust foonist ja seda vaid allika vahetus läheduses – veidi eemal olles olulist vahet enam ei olnud.
Kogu katset ennast saab vaadata Youtubeis: https://www.youtube.com/watch?v=Tttl-5l26QY English: Although gamma rays can easily penetrate through organic material, some of the radiation is absorbed due to different interactions with the matter. English: Gamma Radiation |
Date | |
Source | Own work |
Author | Maido Merisalu |
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This image was uploaded as part of European Science Photo Competition 2015. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:09, 18 November 2015 | 1,684 × 872 (110 KB) | Maido Merisalu (talk | contribs) | User created page with UploadWizard |
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Author | Kasutaja |
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Date and time of data generation | 10:38, 23 May 2015 |
Date and time of digitizing | 10:38, 23 May 2015 |
DateTimeOriginal subseconds | 08 |
DateTimeDigitized subseconds | 08 |