Development of an active detector for radon detection in air

Detalhes bibliográficos
Autor(a) principal: Elísio, Soraia Sofia Clareu
Data de Publicação: 2019
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/39062
Resumo: Tese de mestrado integrado, Engenharia Física, Universidade de Lisboa, Faculdade de Ciências, 2019
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spelling Development of an active detector for radon detection in airDeteção de radão em arFotodíodoColeção eletrostáticaMonitor económico de radãoTeses de mestrado - 2019Departamento de FísicaTese de mestrado integrado, Engenharia Física, Universidade de Lisboa, Faculdade de Ciências, 2019In this thesis, we developed and tested an active device for radon in air detection. It was intended to operate in pulse counting mode for real-time measurements without the need of an active gas pumping system. The prototype presented is relatively simple, low-cost and reproducible, made of inexpensive and easy to acquire components. We used as a sensor the commercial low-cost Si-PIN planar photodiode SLCD-61N5 with an area of 9.67x9.67 mm2, sensitive to alpha particles. An Arduino UNO was attached to the electrical circuit of the device to count the logic pulses and connected to a computer to send and save the data. The initial prototype is comprised of a commercial light-tight metal box with 22.2x14.5x5.5 cm3 with lateral perforations where the gas enters by natural diffusion. Electrical pulse signals corresponding to the hit of the alpha particles in the sensor, distinguishable from noise, were observed in a test using a 241Am source. Indeed , this showed an excellent response to alpha particles detection. We performed three different experiments to estimate the order of magnitude of radon concentration using passive alpha-trackCR-39, the commercial monitor Ramon2.2and a sodium iodide detector employing rocks sample from Nisa uranium mine as radon source. A new alpha-track counting technique, using the free CellProfiler software, was further applied and tested to replace the visual counting method during theCR-39 test. From the comparison between the two techniques, deviations of 1-14% were obtained, which are quite satisfactory, demonstrating the feasibility of use for rapid and cheap analysis of alpha-track detectors. We also performed simultaneous measurements in radon atmosphere to test the prototype comparing its performance with a commercial Geiger given as reference. The total number of counts was recorded in 10 minutes intervals. We observed an increase of the sensitivity response of the prototype for a higher reverse voltage applied to the photodiode. We carried out the same test for a month, keeping a fixed voltage, in order to study the prototype’s stability for long-term measurements. A positive high correlation was obtained. As a future work on it, our study suggests the possibility of making a fully portable detector powered only by batteries and data recording on a memory card attached to the Arduino. This will allow operating in areas where the electricity supply is not stable. Furthermore, despite the ability of the prototype to detect the presence of radon in air calibration study are necessary in order to obtain exact concentrations values.Peralta, Luís Filipe dos Santos Garcia, 1961-Repositório da Universidade de LisboaElísio, Soraia Sofia Clareu2019-07-11T13:23:30Z201920192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/39062TID:202260178enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:37:16Zoai:repositorio.ul.pt:10451/39062Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:52:49.549846Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Development of an active detector for radon detection in air
title Development of an active detector for radon detection in air
spellingShingle Development of an active detector for radon detection in air
Elísio, Soraia Sofia Clareu
Deteção de radão em ar
Fotodíodo
Coleção eletrostática
Monitor económico de radão
Teses de mestrado - 2019
Departamento de Física
title_short Development of an active detector for radon detection in air
title_full Development of an active detector for radon detection in air
title_fullStr Development of an active detector for radon detection in air
title_full_unstemmed Development of an active detector for radon detection in air
title_sort Development of an active detector for radon detection in air
author Elísio, Soraia Sofia Clareu
author_facet Elísio, Soraia Sofia Clareu
author_role author
dc.contributor.none.fl_str_mv Peralta, Luís Filipe dos Santos Garcia, 1961-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Elísio, Soraia Sofia Clareu
dc.subject.por.fl_str_mv Deteção de radão em ar
Fotodíodo
Coleção eletrostática
Monitor económico de radão
Teses de mestrado - 2019
Departamento de Física
topic Deteção de radão em ar
Fotodíodo
Coleção eletrostática
Monitor económico de radão
Teses de mestrado - 2019
Departamento de Física
description Tese de mestrado integrado, Engenharia Física, Universidade de Lisboa, Faculdade de Ciências, 2019
publishDate 2019
dc.date.none.fl_str_mv 2019-07-11T13:23:30Z
2019
2019
2019-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/39062
TID:202260178
url http://hdl.handle.net/10451/39062
identifier_str_mv TID:202260178
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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