Síntese e caracterização de novos materiais luminescentes para detecção de radiação
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFS |
Texto Completo: | http://ri.ufs.br/jspui/handle/riufs/7557 |
Resumo: | This work aims the production of luminescent materials based on MgB4O7 (MBO) and Li2B4O7 (LBO), doped and undoped, by alternative routes, verifying the influence of the route on the optical properties and grain size. Sol-gel protein (SGP) and Pechini (MP) methods were chosen for the production of the samples. Structural characterization of the materials was performed through thermal measurements and X-ray diffraction (XRD). Thermal analyses indicate that the crystallization process of the samples at intervals of 700 to 1000 C for MBO and 500 to 700 C for LBO by both production methods. XRD measurements confirm the formation of single crystalline phase under synthesis conditions 900 C/2h (SGP) and 800 C/2h (MP) for MBO crystal and 650 C/2h (SGP) and 600 C/2h (MP) for MBO. These conditions also were used to doped samples but single phases for doped LBO cannot be obtained. All samples present a coloration that could disrupt the luminescent signal during thermoluminescence (TL) and optically stimulated luminescence (OSL) readings. Samples were washed with hydrogen peroxide aiming to test the influence of coloration in optical properties. Optical measurements showed that the samples no washed with hydrogen peroxide have more efficient TL signal than washed samples. As a rule, the unwashed samples of MBO:Ce,Li produced by both methods showed the best TL signal. The MBO:Dy,Li – SGP – washed samples showed only 10% of the batch discharge units 20 tablets with homogeneity tests. On the other hand, for both MBO:Dy,Li (SGP,MP) were verified that the TL signal decays with the decrease of the grain size and occurs a displacement of the position of the TL peaks. The minimum detectable dose calculated for the washed samples of the MBO:Ce,Li and MBO:Dy,Li were 0.02 Gy and approximately 0.3 Gy respectively for both production methods. The OSL measurements showed MBO:Dy,Li – SGP have the best signal and that grain size have no influence in OSL signal. Phototransferred thermoluminescence effect (PTTE) occurred to MBO:Dy,Li – washed samples. Photoluminescent (PL) measurements indicate high symmetry in the dopant region for the MBO:Ce,Li – MP - washed sample. The LBO samples produced by both methods presented high sensitivity to the production method, precursor reagents used and dopants. |
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Lima, Héstia Raíssa Batista ReisLalic, Susana de Souza2018-03-19T19:43:17Z2018-03-19T19:43:17Z2017-02-22LIMA, Héstia Raíssa Batista Reis. Síntese e caracterização de novos materiais luminescentes para detecção de radiação. 2017. 130 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017.http://ri.ufs.br/jspui/handle/riufs/7557This work aims the production of luminescent materials based on MgB4O7 (MBO) and Li2B4O7 (LBO), doped and undoped, by alternative routes, verifying the influence of the route on the optical properties and grain size. Sol-gel protein (SGP) and Pechini (MP) methods were chosen for the production of the samples. Structural characterization of the materials was performed through thermal measurements and X-ray diffraction (XRD). Thermal analyses indicate that the crystallization process of the samples at intervals of 700 to 1000 C for MBO and 500 to 700 C for LBO by both production methods. XRD measurements confirm the formation of single crystalline phase under synthesis conditions 900 C/2h (SGP) and 800 C/2h (MP) for MBO crystal and 650 C/2h (SGP) and 600 C/2h (MP) for MBO. These conditions also were used to doped samples but single phases for doped LBO cannot be obtained. All samples present a coloration that could disrupt the luminescent signal during thermoluminescence (TL) and optically stimulated luminescence (OSL) readings. Samples were washed with hydrogen peroxide aiming to test the influence of coloration in optical properties. Optical measurements showed that the samples no washed with hydrogen peroxide have more efficient TL signal than washed samples. As a rule, the unwashed samples of MBO:Ce,Li produced by both methods showed the best TL signal. The MBO:Dy,Li – SGP – washed samples showed only 10% of the batch discharge units 20 tablets with homogeneity tests. On the other hand, for both MBO:Dy,Li (SGP,MP) were verified that the TL signal decays with the decrease of the grain size and occurs a displacement of the position of the TL peaks. The minimum detectable dose calculated for the washed samples of the MBO:Ce,Li and MBO:Dy,Li were 0.02 Gy and approximately 0.3 Gy respectively for both production methods. The OSL measurements showed MBO:Dy,Li – SGP have the best signal and that grain size have no influence in OSL signal. Phototransferred thermoluminescence effect (PTTE) occurred to MBO:Dy,Li – washed samples. Photoluminescent (PL) measurements indicate high symmetry in the dopant region for the MBO:Ce,Li – MP - washed sample. The LBO samples produced by both methods presented high sensitivity to the production method, precursor reagents used and dopants.Esse trabalho propõe a produção de materiais luminescentes baseados em MgB4O7 (MBO) e Li2B4O7 (LBO), puros e dopados, por rotas alternativas, verificando a influência da rota sobre as propriedades ópticas e o tamanho do grão. Os métodos sol-gel proteico (SGP) e Pechini (MP) foram escolhidos para a produção das amostras. A caracterização estrutural dos materiais foi realizada através de medições térmicas e difração de raios X (XRD). As análises térmicas indicam que o processo de cristalização das amostras ocorre em intervalos de 700 a 1000 C para MBO e 500 a 700 C para LBO por ambos os métodos de produção. As medidas de XRD confirmam a formação de fase monocristalina em condições de síntese 900 C/2h (SGP) e 800 C/2h (MP) para o MBO; e 650 C/2h (SGP) e 600 C/2h (MP) para o LBO. Essas condições também foram usadas para a preparação de amostras dopadas, porém não foram obtidas fases únicas das amostras de LBO dopadas. Todas as amostras apresentaram uma coloração que poderiam atrapalhar o sinal luminescente durante a termoluminescência (TL) e as leituras de luminescência opticamente estimulada (OSL). Os procedimentos de lavagem com peróxido de hidrogênio foram realizados nas amostras com o objetivo de testar a influência da coloração nas propriedades ópticas. As medições ópticas mostraram que as amostras sem lavagem com peróxido de hidrogênio apresentaram sinais TL com maior intensidade que as amostras lavadas com peróxido de hidrogênio. Em regra, as amostras não lavadas com peróxido de hidrogênio de MBO:Ce,Li produzidas por ambos os métodos mostraram o melhor sinal TL. As amostras lavadas MBO:Dy,Li - SGP mostraram apenas 10% das unidades em lote 20 comprimidos em testes de homogeneidade foram descartadas. Por outro lado, tanto para MBO:Dy,Li (SGP, MP) foram verificados que o sinal TL decai com a diminuição do tamanho do grão e ocorre ao deslocamento da posição dos picos TL. A dose mínima detectável calculada para as amostras lavadas do MBO:Ce,Li e MBO:Dy,Li foram 0,02 Gy e aproximadamente 0,3 Gy, respectivamente, para ambos os métodos de produção. As medidas OSL mostraram MBO:Dy,Li - SGP têm o melhor sinal e que o tamanho do grão não tem influência no sinal OSL. O efeito de termoluminescência fototransferido (PTTE) ocorreu em amostras lavadas com MBO:Dy,Li. As medidas fotoluminescentes (PL) indicam uma simetria elevada na região dopante para a amostra lavada com MBO:Ce,Li - MP. As amostras LBO produzidas por ambos os métodos apresentaram alta sensibilidade ao método de produção, reagentes precursores utilizados e dopantes.São Cristóvão, SEporFísicaTetraborato de magnésioTetraborato de lítioDosimetriaMagnesium tetraborateLithium tetraborateDosimetryCIENCIAS EXATAS E DA TERRA::FISICASíntese e caracterização de novos materiais luminescentes para detecção de radiaçãoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisPós-Graduação em FísicaUniversidade Federal de Sergipereponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/7557/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALHESTIA_RAISSA_BATISTA_R_LIMA.pdfHESTIA_RAISSA_BATISTA_R_LIMA.pdfapplication/pdf5169593https://ri.ufs.br/jspui/bitstream/riufs/7557/2/HESTIA_RAISSA_BATISTA_R_LIMA.pdf195cf9165b86d38a7c8aa3677e23b88cMD52TEXTHESTIA_RAISSA_BATISTA_R_LIMA.pdf.txtHESTIA_RAISSA_BATISTA_R_LIMA.pdf.txtExtracted texttext/plain254315https://ri.ufs.br/jspui/bitstream/riufs/7557/3/HESTIA_RAISSA_BATISTA_R_LIMA.pdf.txt328b8df224c7693f0eadf599c475cf14MD53THUMBNAILHESTIA_RAISSA_BATISTA_R_LIMA.pdf.jpgHESTIA_RAISSA_BATISTA_R_LIMA.pdf.jpgGenerated Thumbnailimage/jpeg1420https://ri.ufs.br/jspui/bitstream/riufs/7557/4/HESTIA_RAISSA_BATISTA_R_LIMA.pdf.jpgf932a385e1807484228edf3bb8ef4c86MD54riufs/75572018-10-16 15:41:36.296oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2018-10-16T18:41:36Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
title |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
spellingShingle |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação Lima, Héstia Raíssa Batista Reis Física Tetraborato de magnésio Tetraborato de lítio Dosimetria Magnesium tetraborate Lithium tetraborate Dosimetry CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
title_full |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
title_fullStr |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
title_full_unstemmed |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
title_sort |
Síntese e caracterização de novos materiais luminescentes para detecção de radiação |
author |
Lima, Héstia Raíssa Batista Reis |
author_facet |
Lima, Héstia Raíssa Batista Reis |
author_role |
author |
dc.contributor.author.fl_str_mv |
Lima, Héstia Raíssa Batista Reis |
dc.contributor.advisor1.fl_str_mv |
Lalic, Susana de Souza |
contributor_str_mv |
Lalic, Susana de Souza |
dc.subject.por.fl_str_mv |
Física Tetraborato de magnésio Tetraborato de lítio Dosimetria |
topic |
Física Tetraborato de magnésio Tetraborato de lítio Dosimetria Magnesium tetraborate Lithium tetraborate Dosimetry CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Magnesium tetraborate Lithium tetraborate Dosimetry |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
This work aims the production of luminescent materials based on MgB4O7 (MBO) and Li2B4O7 (LBO), doped and undoped, by alternative routes, verifying the influence of the route on the optical properties and grain size. Sol-gel protein (SGP) and Pechini (MP) methods were chosen for the production of the samples. Structural characterization of the materials was performed through thermal measurements and X-ray diffraction (XRD). Thermal analyses indicate that the crystallization process of the samples at intervals of 700 to 1000 C for MBO and 500 to 700 C for LBO by both production methods. XRD measurements confirm the formation of single crystalline phase under synthesis conditions 900 C/2h (SGP) and 800 C/2h (MP) for MBO crystal and 650 C/2h (SGP) and 600 C/2h (MP) for MBO. These conditions also were used to doped samples but single phases for doped LBO cannot be obtained. All samples present a coloration that could disrupt the luminescent signal during thermoluminescence (TL) and optically stimulated luminescence (OSL) readings. Samples were washed with hydrogen peroxide aiming to test the influence of coloration in optical properties. Optical measurements showed that the samples no washed with hydrogen peroxide have more efficient TL signal than washed samples. As a rule, the unwashed samples of MBO:Ce,Li produced by both methods showed the best TL signal. The MBO:Dy,Li – SGP – washed samples showed only 10% of the batch discharge units 20 tablets with homogeneity tests. On the other hand, for both MBO:Dy,Li (SGP,MP) were verified that the TL signal decays with the decrease of the grain size and occurs a displacement of the position of the TL peaks. The minimum detectable dose calculated for the washed samples of the MBO:Ce,Li and MBO:Dy,Li were 0.02 Gy and approximately 0.3 Gy respectively for both production methods. The OSL measurements showed MBO:Dy,Li – SGP have the best signal and that grain size have no influence in OSL signal. Phototransferred thermoluminescence effect (PTTE) occurred to MBO:Dy,Li – washed samples. Photoluminescent (PL) measurements indicate high symmetry in the dopant region for the MBO:Ce,Li – MP - washed sample. The LBO samples produced by both methods presented high sensitivity to the production method, precursor reagents used and dopants. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017-02-22 |
dc.date.accessioned.fl_str_mv |
2018-03-19T19:43:17Z |
dc.date.available.fl_str_mv |
2018-03-19T19:43:17Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
LIMA, Héstia Raíssa Batista Reis. Síntese e caracterização de novos materiais luminescentes para detecção de radiação. 2017. 130 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017. |
dc.identifier.uri.fl_str_mv |
http://ri.ufs.br/jspui/handle/riufs/7557 |
identifier_str_mv |
LIMA, Héstia Raíssa Batista Reis. Síntese e caracterização de novos materiais luminescentes para detecção de radiação. 2017. 130 f. Tese (Doutorado em Física) - Universidade Federal de Sergipe, São Cristóvão, SE, 2017. |
url |
http://ri.ufs.br/jspui/handle/riufs/7557 |
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openAccess |
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Pós-Graduação em Física |
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Universidade Federal de Sergipe |
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