Gunshot residues: screening analysis by laser-induced breakdown spectroscopy
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532009001000017 |
Resumo: | Laser induced breakdown spectroscopy (LIBS) is further developed for the detection of gunshot residue (GSR) on the hands of a suspected shooter. To develop the procedure, 114 samples were obtained by pressing a small piece of adhesive tape against the dorsal region of the hands of non-shooters, of shooters just after firing a weapon, and of shooters after washing their hands with soap and water. The tapes were analyzed directly in a time-resolved echelle based LIBS system, assembled in the laboratory, and 20 single laser pulses, spread uniformly on the tape surface, were shown to be enough to ensure the detection of true positives. The spectra obtained by LIBS from the tape present a signature with emission lines that are attributed to barium and lead. After the spectral data was submitted to a pattern recognition method SIMCA (Soft Independent Modeling of Class Analogy), shooters and non-shooters were corrected classified. The method based on LIBS and SIMCA has been demonstrated to be non-destructive of crime evidence and enabled discrimination between the samples collected from non-shooter volunteers and shooter volunteers before and after washing their hands. |
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Gunshot residues: screening analysis by laser-induced breakdown spectroscopylaser-induced breakdown spectroscopygunshot residuesSIMCAscreening analysisLIBSLaser induced breakdown spectroscopy (LIBS) is further developed for the detection of gunshot residue (GSR) on the hands of a suspected shooter. To develop the procedure, 114 samples were obtained by pressing a small piece of adhesive tape against the dorsal region of the hands of non-shooters, of shooters just after firing a weapon, and of shooters after washing their hands with soap and water. The tapes were analyzed directly in a time-resolved echelle based LIBS system, assembled in the laboratory, and 20 single laser pulses, spread uniformly on the tape surface, were shown to be enough to ensure the detection of true positives. The spectra obtained by LIBS from the tape present a signature with emission lines that are attributed to barium and lead. After the spectral data was submitted to a pattern recognition method SIMCA (Soft Independent Modeling of Class Analogy), shooters and non-shooters were corrected classified. The method based on LIBS and SIMCA has been demonstrated to be non-destructive of crime evidence and enabled discrimination between the samples collected from non-shooter volunteers and shooter volunteers before and after washing their hands.Sociedade Brasileira de Química2009-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532009001000017Journal of the Brazilian Chemical Society v.20 n.10 2009reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532009001000017info:eu-repo/semantics/openAccessSilva,Maria JoséCortez,JulianaPasquini,CelioHonorato,Ricardo S.Paim,Ana Paula S.Pimentel,Maria Fernandaeng2011-10-14T00:00:00Zoai:scielo:S0103-50532009001000017Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2011-10-14T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
title |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
spellingShingle |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy Silva,Maria José laser-induced breakdown spectroscopy gunshot residues SIMCA screening analysis LIBS |
title_short |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
title_full |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
title_fullStr |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
title_full_unstemmed |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
title_sort |
Gunshot residues: screening analysis by laser-induced breakdown spectroscopy |
author |
Silva,Maria José |
author_facet |
Silva,Maria José Cortez,Juliana Pasquini,Celio Honorato,Ricardo S. Paim,Ana Paula S. Pimentel,Maria Fernanda |
author_role |
author |
author2 |
Cortez,Juliana Pasquini,Celio Honorato,Ricardo S. Paim,Ana Paula S. Pimentel,Maria Fernanda |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Silva,Maria José Cortez,Juliana Pasquini,Celio Honorato,Ricardo S. Paim,Ana Paula S. Pimentel,Maria Fernanda |
dc.subject.por.fl_str_mv |
laser-induced breakdown spectroscopy gunshot residues SIMCA screening analysis LIBS |
topic |
laser-induced breakdown spectroscopy gunshot residues SIMCA screening analysis LIBS |
description |
Laser induced breakdown spectroscopy (LIBS) is further developed for the detection of gunshot residue (GSR) on the hands of a suspected shooter. To develop the procedure, 114 samples were obtained by pressing a small piece of adhesive tape against the dorsal region of the hands of non-shooters, of shooters just after firing a weapon, and of shooters after washing their hands with soap and water. The tapes were analyzed directly in a time-resolved echelle based LIBS system, assembled in the laboratory, and 20 single laser pulses, spread uniformly on the tape surface, were shown to be enough to ensure the detection of true positives. The spectra obtained by LIBS from the tape present a signature with emission lines that are attributed to barium and lead. After the spectral data was submitted to a pattern recognition method SIMCA (Soft Independent Modeling of Class Analogy), shooters and non-shooters were corrected classified. The method based on LIBS and SIMCA has been demonstrated to be non-destructive of crime evidence and enabled discrimination between the samples collected from non-shooter volunteers and shooter volunteers before and after washing their hands. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532009001000017 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532009001000017 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532009001000017 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.20 n.10 2009 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318170309132288 |