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[{"key": "dc.contributor.advisor", "value": "Siiskonen, Teemu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Kumpulainen, Jaana", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Suutari, Juha", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2015-05-03T17:41:54Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2015-05-03T17:41:54Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2015", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1473077", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/45755", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Tietokonetomografiassa sa\u0308teilyannoksen ma\u0308a\u0308ritta\u0308miseen ka\u0308ytetta\u0308va\u0308t ionisaatiokammiot kalibroidaan tavallisimmin vapaasti ilmassa suhteessa ilmakermaan. Kalibrointika\u0308yta\u0308nno\u0308ista\u0308 voi kuitenkin aiheutua epa\u0308varmuutta annoksen ma\u0308a\u0308ritta\u0308miseen fantomimittauksissa, silla\u0308 olosuhteet fantomissa ovat erilaiset kuin vapaasti ilmassa.\r\n\r\nTa\u0308ssa\u0308 tyo\u0308ssa\u0308 tutkittiin kalibrointika\u0308yta\u0308nno\u0308ista\u0308 johtuvia epa\u0308varmuuksia annosmittauksissa. Tyo\u0308n kokeellisessa osassa mitattiin era\u0308a\u0308n puikkomaisen ionisaatiokammion energiavaste ja na\u0308iden tulosten pohjalta mallinnettiin kammio Monte Carlo -menetelma\u0308lla\u0308 tehta\u0308via\u0308 simulaatioita varten. Kammion mallintamisen ja\u0308lkeen simulaatioissa tutkittiin absorboituneita annoksia fantomin ilmatilavuudessa ja kammion aktiivisessa tilavuudessa.\r\n\r\nSimulaatioista havaittiin, etta\u0308 absorboitunut annos kammiossa oli noin 30 \u2013 40 % suurempi kuin annos fantomin ilmatilavuudessa. Eron pa\u0308a\u0308teltiin johtuvan pa\u0308a\u0308osin kammion keskielektrodin aiheuttamasta sekunda\u0308a\u0308risa\u0308teilysta\u0308 ja korjautuvan suurimmalta osin kalibrointikertoimessa. Sen sijaan spektrin muutoksesta laskettua noin 4 % eroa vapaasti ilmassa ma\u0308a\u0308ritetty kalibrointikerroin ei huomioi.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Juha Suutari (jupasasu) on 2015-05-03 17:41:53.921171. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija@noreply.fi) on 2015-05-03T17:41:54Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201505031708.pdf: 5563169 bytes, checksum: 6771ade3027f9153aa9d318dfec9da83 (MD5)\r\nlicense.html: 4835 bytes, checksum: 82bd948b04e9475ec9e8d9826db7c654 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2015-05-03T17:41:54Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201505031708.pdf: 5563169 bytes, checksum: 6771ade3027f9153aa9d318dfec9da83 (MD5)\r\nlicense.html: 4835 bytes, checksum: 82bd948b04e9475ec9e8d9826db7c654 (MD5)\r\n Previous issue date: 2015", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (64 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "S\u00e4teilyturvakeskus", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Tietokonetomografian annosmittaukset : kalibrointik\u00e4yt\u00e4nn\u00f6t ja ep\u00e4varmuudet", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201505031708", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", 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