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[{"key": "dc.contributor.advisor", "value": "Per\u00e4j\u00e4rvi, Kari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Jokinen, Ari", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Virkki, Olli", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2018-06-20T10:26:15Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2018-06-20T10:26:15Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/58661", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Muovisia tuikeilmaisimia k\u00e4ytet\u00e4\u00e4n laajasti s\u00e4teilyvalvonnassa sek\u00e4 teollisuudessa ett\u00e4 rajavalvonnassa. Niiden suhteellisen matalat materiaalikustannukset, massatuotantokyky, tuikemateriaalin nopeus sek\u00e4 suuret koot mahdollistavat nopean k\u00e4ytt\u00f6\u00f6noton ja korkeat havaitsemistehokkuudet. T\u00e4m\u00e4n takia niit\u00e4 k\u00e4ytet\u00e4\u00e4n l\u00e4hes jokaisella s\u00e4teilymonitorointiasemalla. Muovisilla tuikeilmaisimilla on vaikeuksia tunnistaa eri s\u00e4teilyl\u00e4hteit\u00e4, jonka takia niit\u00e4 on k\u00e4ytetty aiemmin p\u00e4\u00e4asiassa s\u00e4teily\u00e4 havaitsevina laskureina. Teollisuudessa ja l\u00e4\u00e4ketieteess\u00e4 k\u00e4ytett\u00e4vien s\u00e4teilyl\u00e4hteiden kysynn\u00e4n kasvaessa riski s\u00e4teilyl\u00e4hteiden sopimattomaan ja huolimattomaan k\u00e4ytt\u00f6\u00f6n kasvaa. Normaalissa liikenteess\u00e4 kulkee my\u00f6s paljon luonnon radioaktiivisia aineita (NORM) sis\u00e4lt\u00e4vi\u00e4 l\u00e4hteit\u00e4, jotka eiv\u00e4t vaadi tutkinnallisia jatkotoimenpiteit\u00e4. Jotta ylim\u00e4\u00e4r\u00e4inen ty\u00f6 saataisiin minimoitua kuitenkin pit\u00e4en s\u00e4teilyvalvonnan taso korkealla, s\u00e4teilyl\u00e4hdetunnistusta on tutkittu ja sovellettu muovisillekin tuikeilmaisimille.\n\nT\u00e4m\u00e4 pro-gradu tutkielma pyrkii avartamaan muovisten tuikeilmaisimien toimintaa operatiivisesta n\u00e4k\u00f6kulmasta. Tutkielmassa esitell\u00e4\u00e4n ja kokeillaan k\u00e4yt\u00e4nn\u00f6ss\u00e4 nukliditunnistusta edist\u00e4vi\u00e4 analysointeja sek\u00e4 erilaisia karakterisointimenetelmi\u00e4 muovin toimintakyvyn tarkastelemiseksi. N\u00e4m\u00e4 metodit voidaan suorittaa kentt\u00e4olosuhteissa ja on sovellettavissa muovisiin ja muunlaisiin tuikeilmaisimiin kent\u00e4ll\u00e4 ja laboratoriossa.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Plastic scintillators (PS) are widely used as radiation monitors in industry and border control. Besides being a fast scintillation material, the low material cost, efficient bulk production and high sensitivity due to big sizes have made PSs a foundation of most radiation monitors as they are fast and cheap to deploy and efficient detectors. Due to their limited capabilities to distinguish different radiation sources, in the past they were mainly used as rough counters only to detect radiation. The increasing demand for different radioactive materials in industry and medical field increase the risk of illicit and inadvertent use or radiation sources. As a counterpart, the abundant naturally occurring radioactive materials (NORMs) in most cases do not require further investigation. Minimizing unnecessary workload while keeping the radiation monitoring efficient gives rise to the need of radiation source identification methods.\n\nThe goal of this Master's thesis is to offer insight for plastic scintillators from an operational viewpoint. Possible next-generation operation modes for more precise radiation monitoring as well as different characterization methods to probe the functionality of a plastic scintillator are presented and tested in practice. The methods can be executed in on-field conditions and are applicable for plastic and other scintillation materials used in both operational and laboratory purposes.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2018-06-20T10:26:15Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2018-06-20T10:26:15Z (GMT). No. of bitstreams: 0\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "80", "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": "scintillator", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "operative", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Distinguishing different radioactive sources with operative plastic scintillators", "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-201806203290", "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": "monitorointi", "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": "spektroskopia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "gammas\u00e4teily", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ilmaisimet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sironta", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "radioaktiivinen s\u00e4teily", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spektrit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "monitoring", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "radiation", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spectroscopy", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "gamma radiation", "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": "scattering (physics)", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "radioactive radiation", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spectra", "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", 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