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[{"key": "dc.contributor.advisor", "value": "Kettunen, Heikki", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Lahti, Valtteri", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-06-21T12:36:23Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-06-21T12:36:23Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1704294", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/54634", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Komponenttis\u00e4teilytykseen valjastetusta Varian Clinac 2100 C/D -lineaarikiihdyttimest\u00e4 luotiin Monte Carlo -menetelmi\u00e4 hy\u00f6dynt\u00e4v\u00e4 simulaatiomalli. Malli luotiin aineen ja s\u00e4teilyn vuorovaikutuksien laskennalliseen mallintamiseen tarkoitettua Geant4 -ohjelmointity\u00f6kalupakettia k\u00e4ytt\u00e4en. Mallin kyky ennustaa mittaustuloksia kiihdyttimen tuottamasta 20 MeV:in elektronisuihkusta todennettiin laskettuja ja mitattuja tuloksia vertailemalla, ja mallin jatkokehityksen kannalta t\u00e4rkeimm\u00e4t toimenpiteet m\u00e4\u00e4riteltiin. Lis\u00e4ksi arvioitiin mallin ennustamaa absorpoitunutta annosta vesi- ja piifantomeissa, sek\u00e4 laskettiin viitearvo absorpoituneen annoksen ja elektronivuon suhteelle. Lasketut annosprofiilit vastasivat mittaustuloksia hyvin, mutta tulosten v\u00e4lill\u00e4 oli pieni\u00e4 johdonmukaisia poikkeamia, jotka selittyiv\u00e4t laskennallisen mallin elektronisuihkun odotettua suuremmilla matalaenergisten elektronien ja fotonien osuuksilla. Poikkeamat suihkun hiukkaskoostumuksessa ja energiajakaumassa johtuivat todenn\u00e4k\u00f6isesti kiihdyttimen sirontakalvojen mallista, joka perustui kirjallisuudesta l\u00f6ydettyihin viitearvoihin tarkkojen materiaali- ja mittatietojen puuttuessa. Lis\u00e4ksi laskennallissa tuloksissa havaittiin hienoista tilastollista ep\u00e4tarkkuutta jota on mahdollista karsia suurentamalla prim\u00e4\u00e4rielektronien otoskokoa suuremman laskentatehon ollessa saatavilla.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "A Monte Carlo simulation model of a Varian Clinac 2100 C/D linear accelerator was created in the context of studying radiation effects in electronics. The model was created using Geant4 programming toolkit for modeling the interactions of radiation and matter. The model\u2019s ability to predict measurement results about a 20 MeV electron beam was validated by comparing the computed and measured results and recommended steps of future research and development work were defined. Also the absorbed dose in water and silicon phantoms predicted by the model were evaluated and a reference value for the ratio of the absorbed dose and incident electron fluence was calculated. The computed dose profiles were found to be in good agreement with the measured results, but consistent minor deviations between the results were also observed. The differences between the computed and measured results were tracked down to unexpectedly high fractions of low-energy electrons and photons in the computed beam. These anomalies are most likely a consequence of the dual\r\nscattering foil model used in the simulation. The model of this part of the accelerator was based on reference values found from literature in the lack of more validated data. In addition, there was small inherent statistical uncertainty to the results which can be done away by increasing the sample size of primary electrons when greater computational power is available.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Valtteri Lahti (vajolait) on 2017-06-21 12:36:23.277951. 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.group@korppi.jyu.fi) on 2017-06-21T12:36:23Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201706213011.pdf: 2959661 bytes, checksum: 4b9d096c741643160f82a3031aa31e3d (MD5)\r\nlicense.html: 4851 bytes, checksum: b54f6148d52af5bc1797e78cf5c30d31 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-06-21T12:36:23Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201706213011.pdf: 2959661 bytes, checksum: 4b9d096c741643160f82a3031aa31e3d (MD5)\r\nlicense.html: 4851 bytes, checksum: b54f6148d52af5bc1797e78cf5c30d31 (MD5)\r\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (115 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": "eng", "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": "Varian Clinac 2100 C/D", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Linear accelerators", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Electron beams", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Computational model", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Monte Carlo simulations of high-energy electron beams : model validation and dose calculations", "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-201706213011", "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", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2017-06-21T12:36:24Z", "language": "", "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": "fi", "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4023", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Monte Carlo -menetelm\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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