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[{"key": "dc.contributor.advisor", "value": "Joutsenvaara, Jari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Loo, Kai", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Rytk\u00f6nen, Heidi", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-12-21T12:30:05Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-12-21T12:30:05Z", "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:1810015", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/56521", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Nestem\u00e4isi\u00e4 tuikeaineita hy\u00f6dynt\u00e4v\u00e4t ilmaisimet ovat saaneet jalansijaa neutriinofysiikassa viime vuosikymmenin\u00e4. Perinteisiin Cherenkovin ilmaisimiin niiden etu on suurempi hiukkasten vuorovaikutuksesta aiheutuvan valon tuotto. Lis\u00e4ksi edullisten, suhteellisen ymp\u00e4rist\u00f6yst\u00e4v\u00e4llisten ja optisesti kirkkaiden tuikeaineyhdisteiden (bentseenin alkyylijohdannaiset) saatavuus mahdollistaa yh\u00e4 suurempien ilmaisimien rakennuksen. Nestem\u00e4isten tuikeaineiden ongelmana on kuitenkin niiden taipumus ker\u00e4t\u00e4 ep\u00e4puhtauksia itseens\u00e4 ja niiden muutosalttius UV-s\u00e4teilyn ja korkeiden l\u00e4mp\u00f6tilojen vaikutuksesta. Muutokset heikent\u00e4v\u00e4t tuikeaineiden valon tuottoa, ja siksi nestem\u00e4isten tuikeaineiden puhdistusta ja optisia ominaisuuksia on tutkittava, jotta saatavilla on mahdollisimman tehokas kohtio neutriinoille.\r\n\r\nT\u00e4ss\u00e4 tutkimuksessa er\u00e4 bentseenin\u00e4ytteit\u00e4 puhdistettiin kemiassa yleisesti k\u00e4yt\u00f6ss\u00e4 olevalla menetelm\u00e4ll\u00e4, pylv\u00e4skromatografialla: n\u00e4ytteet suodatettiin hienojakoisen alumiinioksidin l\u00e4pi useaan kertaan. N\u00e4ytteiden kirkkautta mitattiin laitteistolla, jossa Raspberry Pi -minitietokoneen kameramoduulia k\u00e4ytettiin valosensorina. Bentseenin alkyylijohdannaisten pitk\u00e4 vaimenemispituus aiheuttaa ongelmia mitattaessa valon vaimenemista: laitteiston tulisi olla niin pitk\u00e4, ett\u00e4 n\u00e4ytteiden erot kirkkaudessa saataisiin erotettua paremmin. Tutkimuksen tarkoituksena on my\u00f6s selvitt\u00e4\u00e4 onko eroja mahdollista havaita pienemm\u00e4ll\u00e4 ja edullisemmalla laitteistolla.\r\n\r\nTuloksien mukaan laitteisto ei pysty nykyisess\u00e4 muodossaan erottamaan n\u00e4ytteit\u00e4, joilla on hyvin pitk\u00e4 vaimenemispituus. Ihanteellisessa tilanteessa laitteistolla on mahdollista havaita eroja n\u00e4ytteiden v\u00e4lill\u00e4, joiden absorptiossa on 0,4 % ero. N\u00e4ytes\u00e4ili\u00f6iden pituus (50 mm) ei ollut tarpeeksi suuri, jotta valo olisi vaimentunut tarpeeksi.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Use of liquid scintillator detectors has been an increasing trend in neutrino physics within the last decades. The light yield of scintillator detectors surpasses the traditional Cherenkov counters and availability of low-cost and relatively safe compounds (linear alkylbenzenes) as liquid scintillator solvent allows the construction of larger neutrino detectors. A downside of liquid scintillators is their tendency to get easily contaminated and undergo changes via exposure to UV light and elevated temperatures. For these reasons, purification and optical properties of liquid scintillators must be studied to make them suitable for large neutrino detectors.\r\n\r\nIn this study a set of linear alkylbenzene samples were purified by a standard method used in chemistry called column chromatography: the samples were passed through a fine purification material (aluminum oxide) several times. The transparency measurements for the samples were carried out via a setup using a Raspberry camera module as a light detector. The long attenuation length of linear alkylbenzene is problematic for light measurements since it means that the setup must be long enough to detect differences between the purified samples. This setup was built to examine if it is possible to detect differences with this kind of low-cost setup.\r\n\r\nResults showed that the current setup is not precise enough to detect any differences between samples with long attenuation lengths. The setup is ideally able to distinguish samples that have at least difference of 0.4 % in their absorbance. The path length of LAB (50 mm) was not long enough to decrease the light input so that the samples would have had differences over 0.4 %.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Heidi Rytk\u00f6nen (heimarry) on 2017-12-21 12:30:00.431222. 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 2017-12-21T12:30:05Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201712214849.pdf: 15352377 bytes, checksum: 36925a4f3f20309fb4094925e4b92783 (MD5)\r\nlicense.html: 4830 bytes, checksum: 4a8054554967b0f1bb9a041f2e4a131e (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-12-21T12:30:05Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201712214849.pdf: 15352377 bytes, checksum: 36925a4f3f20309fb4094925e4b92783 (MD5)\r\nlicense.html: 4830 bytes, checksum: 4a8054554967b0f1bb9a041f2e4a131e (MD5)\r\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (68 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": "nestem\u00e4iset tuikeaineet", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "linear alkylbenzene", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "liquid scintillation counting", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "C14 experiment", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Callio Lab", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Analysis of linear alkylbenzene samples with a camera-based equipment", "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-201712214849", "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": "Fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2017-12-21T12:30:05Z", "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": "4021", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "bentseeni", "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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