Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university
This paper describes analytical protocols adopted for calibrating a portable gamma rays spectrometer using a 2ʺ × 2ʺ NaI(Tl) scintillation detector for performing exploration and environmental surveys. The steps involved the determination of counting times with good accuracy, calibration in energy a...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/179576 |
| Acceso en línea: | http://dx.doi.org/10.1007/s12665-018-7303-z http://hdl.handle.net/11449/179576 |
| Access Level: | acceso abierto |
| Palabra clave: | Calibration Effective dose K, eU, and eTh windows NaI(Tl) scintillation detector Portable gamma rays spectrometer |
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Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian universityCalibrationEffective doseK, eU, and eTh windowsNaI(Tl) scintillation detectorPortable gamma rays spectrometerThis paper describes analytical protocols adopted for calibrating a portable gamma rays spectrometer using a 2ʺ × 2ʺ NaI(Tl) scintillation detector for performing exploration and environmental surveys. The steps involved the determination of counting times with good accuracy, calibration in energy and concentration, and data conversion to effective dose (Ed) for monitoring the radioactivity levels in the air, for indoor and outdoor environments. The χ2 test was applied to the counting rate data acquired for ten different readings, allowing determine the greater accuracy among them. Some standards yielded values above of the detection limit for calibrating the K, eU, and eTh windows, whereas empirical equations provided satisfactory results. The count rates in these windows were obtained in selected environments related to Geology teaching activities in a Brazilian university. Then, they were converted to Ed, showing the applicability of the adopted procedures for environmental surveys. The radiological monitoring showed two sites exhibiting Ed values above the WHO guideline reference value of 1 mSv/year. The first was in a minerals and rocks museum and the second in a deposit (litoteca) dedicated to the rocks storage. Thus, the members of the public are only occasionally exposed to the natural gamma radiation there. Additionally, the Ed values are much lower than the recommended limit of 20 mSv/year for occupationally exposed individuals.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Instituto de Geociências e Ciências Exatas-IGCE Universidade Estadual Paulista-UNESP, Av. 24-A No. 1515, P.O. Box 178Instituto de Geociências e Ciências Exatas-IGCE Universidade Estadual Paulista-UNESP, Av. 24-A No. 1515, P.O. Box 178Universidade Estadual Paulista (Unesp)2018-12-11T17:35:44Z2018-12-11T17:35:44Z2018-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dx.doi.org/10.1007/s12665-018-7303-zEnvironmental Earth Sciences, v. 77, n. 3, 2018.1866-62991866-6280http://hdl.handle.net/11449/17957610.1007/s12665-018-7303-z2-s2.0-850417427632-s2.0-85041742763.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEnvironmental Earth Sciences0,552info:eu-repo/semantics/openAccessBarbosa, Eder Queiroz [UNESP]Bonotto, Daniel Marcos [UNESP]Roveratti, Gabrielle [UNESP]2024-11-28T13:41:54Zoai:repositorio.unesp.br:11449/179576Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462024-11-28T13:41:54Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
| dc.title.none.fl_str_mv |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| title |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| spellingShingle |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university Barbosa, Eder Queiroz [UNESP] Calibration Effective dose K, eU, and eTh windows NaI(Tl) scintillation detector Portable gamma rays spectrometer |
| title_short |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| title_full |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| title_fullStr |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| title_full_unstemmed |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| title_sort |
Standardization of a NaI(Tl) scintillation detector and its use on environments for Geology teaching in a Brazilian university |
| dc.creator.none.fl_str_mv |
Barbosa, Eder Queiroz [UNESP] Bonotto, Daniel Marcos [UNESP] Roveratti, Gabrielle [UNESP] |
| author |
Barbosa, Eder Queiroz [UNESP] |
| author_facet |
Barbosa, Eder Queiroz [UNESP] Bonotto, Daniel Marcos [UNESP] Roveratti, Gabrielle [UNESP] |
| author_role |
author |
| author2 |
Bonotto, Daniel Marcos [UNESP] Roveratti, Gabrielle [UNESP] |
| author2_role |
author author |
| dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
| dc.subject.por.fl_str_mv |
Calibration Effective dose K, eU, and eTh windows NaI(Tl) scintillation detector Portable gamma rays spectrometer |
| topic |
Calibration Effective dose K, eU, and eTh windows NaI(Tl) scintillation detector Portable gamma rays spectrometer |
| description |
This paper describes analytical protocols adopted for calibrating a portable gamma rays spectrometer using a 2ʺ × 2ʺ NaI(Tl) scintillation detector for performing exploration and environmental surveys. The steps involved the determination of counting times with good accuracy, calibration in energy and concentration, and data conversion to effective dose (Ed) for monitoring the radioactivity levels in the air, for indoor and outdoor environments. The χ2 test was applied to the counting rate data acquired for ten different readings, allowing determine the greater accuracy among them. Some standards yielded values above of the detection limit for calibrating the K, eU, and eTh windows, whereas empirical equations provided satisfactory results. The count rates in these windows were obtained in selected environments related to Geology teaching activities in a Brazilian university. Then, they were converted to Ed, showing the applicability of the adopted procedures for environmental surveys. The radiological monitoring showed two sites exhibiting Ed values above the WHO guideline reference value of 1 mSv/year. The first was in a minerals and rocks museum and the second in a deposit (litoteca) dedicated to the rocks storage. Thus, the members of the public are only occasionally exposed to the natural gamma radiation there. Additionally, the Ed values are much lower than the recommended limit of 20 mSv/year for occupationally exposed individuals. |
| publishDate |
2018 |
| dc.date.none.fl_str_mv |
2018-12-11T17:35:44Z 2018-12-11T17:35:44Z 2018-02-01 |
| dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
| dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s12665-018-7303-z Environmental Earth Sciences, v. 77, n. 3, 2018. 1866-6299 1866-6280 http://hdl.handle.net/11449/179576 10.1007/s12665-018-7303-z 2-s2.0-85041742763 2-s2.0-85041742763.pdf |
| url |
http://dx.doi.org/10.1007/s12665-018-7303-z http://hdl.handle.net/11449/179576 |
| identifier_str_mv |
Environmental Earth Sciences, v. 77, n. 3, 2018. 1866-6299 1866-6280 10.1007/s12665-018-7303-z 2-s2.0-85041742763 2-s2.0-85041742763.pdf |
| dc.language.iso.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
Environmental Earth Sciences 0,552 |
| 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 |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
| instname_str |
Universidade Estadual Paulista (UNESP) |
| instacron_str |
UNESP |
| institution |
UNESP |
| reponame_str |
Repositório Institucional da UNESP |
| collection |
Repositório Institucional da UNESP |
| repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
| repository.mail.fl_str_mv |
repositoriounesp@unesp.br |
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1853672447183683584 |
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15.301603 |