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[{"key": "dc.contributor.advisor", "value": "Rahkila, Panu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Greenlees, Paul", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Celik, Oskar", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-12-19T06:29:01Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-12-19T06:29:01Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2022", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/84448", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 ty\u00f6ss\u00e4 rakennettiin prototyyppi pintakontaminaatiomittarista, joka kykeni\nerottamaan alfa- ja beetas\u00e4teilyn toisistaan ja samanaikaisesti mittaamaan kyseisten\ns\u00e4teilyl\u00e4hteiden paikan. Motivaationa t\u00e4lle ty\u00f6lle toimi tarve kehitt\u00e4\u00e4 tekniikkaa, joka helpottaisi aktiivisuuskatteen paikkaherkk\u00e4\u00e4 m\u00e4\u00e4ritt\u00e4mist\u00e4 pintakontaminaation\nmittaamisessa. Erottelukyky alfa- ja beetas\u00e4teilyn v\u00e4lill\u00e4 saavutettiin asettamalla kerros sinkkisulfidia polyvinyylitolueenista koostuvan tuikemuovin p\u00e4\u00e4lle, mittaamalla\nemittoitunut valo piivalomonistimella, ja erottelemalla eri signaalit pulssimuotojensa\nperusteella. Neli\u00f6nmallisen detektorin paikkaherkkyys x-suunnassa saatiin aikaan\nmittaamalla vaimentuneiden pulssien korkeuksien suhteita, kun tuikepulssi vaimeni\npaikan funktiona edetess\u00e4\u00e4n tuikemuovissa. Paikkainformaatio y-suunnassa saatiin\nsen perusteella, mist\u00e4 tuike-elementist\u00e4 signaali havaittiin. Rakennetun prototyypin ilmaisinala oli 10 cm \u00d7 10 cm. Alfa- ja beetas\u00e4teilyn erottelu toteutettiin onnistuneesti\nja laitteen paikkaresoluutioksi saatiin karkeasti 1 cm^2.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "A prototype contamination monitor was built, which had the ability to separately detect alpha and beta radiation and the ability to simultaniously measure the position of the source of radiation. The motivation behind this work was the need to advance techniques towards locally quantifying surface activity when measuring radioactive surface contamination. The discrimination between alpha and beta radiation was achieved by layering zinc sulphide on a polyvinyltoluene plastic scintillator, measuring the yielded light with a silicon photomultiplier, and using pulse shape discrimination to analyze the two types of signals. Positional sensitivity in the x-direction on the square-shaped detector was achieved by measuring the ratio of pulse heights of attenuated signals, as the pulse height of a scintillation event was a function of position in the plastic scintillator. Positional information in the y-direction was based on which scintillator element the signal was detected from. The size of the detector area was 10 cm \u00d7 10 cm in the finished prototype. The discrimination between alpha radiation and beta radiation was succesful, and a positional accuracy of roughly 1 cm^2 was achieved.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2022-12-19T06:29:01Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-12-19T06:29:01Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "48", "language": "", "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": "detektori", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "valomonistin", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Prototype surface contamination monitor with positional sensitivity", "language": "", "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-202212195703", "language": "", "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": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "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": "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": null, "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": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ilmaisimet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kontaminaatio", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "s\u00e4teily", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "detectors", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "contamination", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "radiation", "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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