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Barbagallo M, Colonna N, Aberle O, Andrzejewski J, Audouin L, Bécares V, Bacak M, Balibrea J, Barros S, Bečvář F, Beinrucker C, Berthoumieux E, Billowes J, Bosnar D, Brugger M, Caamaño M, Calviño F, Calviani M, Cano-Ott D, Cardella R, Casanovas A, Castelluccio D, Cerutti F, Chen Y, Chiaveri E, Cortés G, Cortés-Giraldo M, Cosentino L, Damone L, Diakaki M, Domingo-Pardo C, Dressler R, Dupont E, Durán I, Fernández-Domínguez B, Ferrari A, Ferreira P, Finocchiaro P, Furman V, Göbel K, García A, Gawlik A, Glodariu T, Gonçalves I, González E, Goverdovski A, Griesmayer E, Guerrero C, Gunsing F, Harada H, Heftrich T, Heinitz S, Heyse J, Jenkins D, Jericha E, Käppeler F, Kadi Y, Katabuchi T, Kavrigin P, Ketlerov V, Khryachkov V, Kimura A, Kivel N, Kokkoris M, Krtička M, Leal-Cidoncha E, Lederer C, Leeb H, Lerendegui-Marco J, Meo SL, Lonsdale S, Losito R, Macina D, Marganiec J, Martínez T, Massimi C, Mastinu P, Mastromarco M, Matteucci F, Maugeri E, Mendoza E, Mengoni A, Milazzo P, Mingrone F, Mirea M, Montesano S, Musumarra A, Nolte R, Oprea A, Patronis N, Pavlik A, Perkowski J, Porras J, Praena J, Quesada J, Rajeev K, Rauscher T, Reifarth R, Riego-Perez A, Rout P, Rubbia C, Ryan J, Sabaté-Gilarte M, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Sedyshev P, Smith A, Stamatopoulos A, Tagliente G, Tain J, Tarifeño-Saldivia A, Tassan-Got L, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Vlachoudis V, Vlastou R, Wallner A, Warren S, Weigand M, Weiss C, Wolf C, Woods P, Wright T, Žugec P. 7Be(n,α) and 7Be(n,p) cross-section measurement for the cosmological lithium problem at the n_TOF facility at CERN. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201714601012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mastromarco M, Barbagallo M, Vermeulen M, Colonna N, Altstadt S, Andrzejewski J, Audouin L, Bécares V, Bečvář F, Belloni F, Berthoumieux E, Billowes J, Bosnar D, Brugger M, Calviño F, Calviani M, Cano-Ott D, Carrapiço C, Cerutti F, Chiaveri E, Chin M, Cortés G, Cortés-Giraldo M, Diakaki M, Domingo-Pardo C, Durán I, Dzysiuk N, Eleftheriadis C, Ferrari A, Fraval K, Furman V, Gómez-Hornillos M, Ganesan S, García A, Giubrone G, Gonçalves I, González E, Goverdovski A, Griesmayer E, Guerrero C, Gunsing F, Gurusamy P, Heftrich T, Heinitz S, Hernández-Prieto A, Heyse J, Jenkins D, Jericha E, Käppeler F, Kadi Y, Karadimos D, Katabuchi T, Ketlerov V, Khryachkov V, Koehler P, Kokkoris M, Kroll J, Krtička M, Lampoudis C, Langer C, Leal-Cidoncha E, Lederer C, Leeb H, Leong L, Lerendegui-Marco J, Licata M, Losito R, Manousos A, Marganiec J, Martínez T, Massimi C, Mastinu P, Mendoza E, Mengoni A, Milazzo P, Mingrone F, Mirea M, Mondelaers W, Paradela C, Pavlik A, Perkowski J, Plompen A, Praena J, Quesada J, Rauscher T, Reifarth R, Riego-Perez A, Robles M, Roman F, Rubbia C, Ryan J, Sabaté-Gilarte M, Sarmento R, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Sedyshev P, Tagliente G, Tain J, Tarifeño-Saldivia A, Tarrío D, Tassan-Got L, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Versaci R, Vlachoudis V, Vlastou R, Wallner A, Ware T, Weigand M, Weiss C, Wright T, Žugec P. The 236U neutron capture cross-section measured at the n_TOF CERN facility. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201714611054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Barbagallo M, Musumarra A, Cosentino L, Maugeri E, Heinitz S, Mengoni A, Dressler R, Schumann D, Käppeler F, Colonna N, Finocchiaro P, Ayranov M, Damone L, Kivel N, Aberle O, Altstadt S, Andrzejewski J, Audouin L, Bacak M, Balibrea-Correa J, Barros S, Bécares V, Bečvář F, Beinrucker C, Berthoumieux E, Billowes J, Bosnar D, Brugger M, Caamaño M, Calviani M, Calviño F, Cano-Ott D, Cardella R, Casanovas A, Castelluccio DM, Cerutti F, Chen YH, Chiaveri E, Cortés G, Cortés-Giraldo MA, Cristallo S, Diakaki M, Domingo-Pardo C, Dupont E, Duran I, Fernandez-Dominguez B, Ferrari A, Ferreira P, Furman W, Ganesan S, García-Rios A, Gawlik A, Glodariu T, Göbel K, Gonçalves IF, González-Romero E, Griesmayer E, Guerrero C, Gunsing F, Harada H, Heftrich T, Heyse J, Jenkins DG, Jericha E, Katabuchi T, Kavrigin P, Kimura A, Kokkoris M, Krtička M, Leal-Cidoncha E, Lerendegui J, Lederer C, Leeb H, Lo Meo S, Lonsdale SJ, Losito R, Macina D, Marganiec J, Martínez T, Massimi C, Mastinu P, Mastromarco M, Mazzone A, Mendoza E, Milazzo PM, Mingrone F, Mirea M, Montesano S, Nolte R, Oprea A, Pappalardo A, Patronis N, Pavlik A, Perkowski J, Piscopo M, Plompen A, Porras I, Praena J, Quesada J, Rajeev K, Rauscher T, Reifarth R, Riego-Perez A, Rout P, Rubbia C, Ryan J, Sabate-Gilarte M, Saxena A, Schillebeeckx P, Schmidt S, Sedyshev P, Smith AG, Stamatopoulos A, Tagliente G, Tain JL, Tarifeño-Saldivia A, Tassan-Got L, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Vlachoudis V, Vlastou R, Vollaire J, Wallner A, Warren S, Weigand M, Weiß C, Wolf C, Woods PJ, Wright T, Žugec P. ^{7}Be(n,α)^{4}He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN. PHYSICAL REVIEW LETTERS 2016; 117:152701. [PMID: 27768364 DOI: 10.1103/physrevlett.117.152701] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Indexed: 06/06/2023]
Abstract
The energy-dependent cross section of the ^{7}Be(n,α)^{4}He reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron energy. The challenges posed by the short half-life of ^{7}Be and by the low reaction cross section have been overcome at n_TOF thanks to an unprecedented combination of the extremely high luminosity and good resolution of the neutron beam in the new experimental area (EAR2) of the n_TOF facility at CERN, the availability of a sufficient amount of chemically pure ^{7}Be, and a specifically designed experimental setup. Coincidences between the two alpha particles have been recorded in two Si-^{7}Be-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.
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Kulka U, Abend M, Ainsbury E, Badie C, Barquinero JF, Barrios L, Beinke C, Bortolin E, Cucu A, De Amicis A, Domínguez I, Fattibene P, Frøvig, AM, Gregoire E, Guogyte K, Hadjidekova V, Jaworska A, Kriehuber R, Lindholm C, Lloyd D, Lumniczky K, Lyng F, Meschini R, Mörtl S, Della Monaca S, Monteiro Gil O, Montoro A, Moquet J, Moreno M, Oestreicher U, Palitti F, Pantelias G, Patrono C, Piqueret-Stephan L, Port M, Prieto MJ, Quintens R, Ricoul M, Romm H, Roy L, Sáfrány G, Sabatier L, Sebastià N, Sommer S, Terzoudi G, Testa A, Thierens H, Turai I, Trompier F, Valente M, Vaz P, Voisin P, Vral A, Woda C, Zafiropoulos D, Wojcik A. RENEB – Running the European Network of biological dosimetry and physical retrospective dosimetry. Int J Radiat Biol 2016; 93:2-14. [DOI: 10.1080/09553002.2016.1230239] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Monteiro Gil O, Vaz P, Romm H, De Angelis C, Antunes AC, Barquinero JF, Beinke C, Bortolin E, Burbidge CI, Cucu A, Della Monaca S, Domene MM, Fattibene P, Gregoire E, Hadjidekova V, Kulka U, Lindholm C, Meschini R, M’Kacher R, Moquet J, Oestreicher U, Palitti F, Pantelias G, Montoro Pastor A, Popescu IA, Quattrini MC, Ricoul M, Rothkamm K, Sabatier L, Sebastià N, Sommer S, Terzoudi G, Testa A, Trompier F, Vral A. Capabilities of the RENEB network for research and large scale radiological and nuclear emergency situations. Int J Radiat Biol 2016; 93:136-141. [DOI: 10.1080/09553002.2016.1227107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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81
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Costa J, P.Teles, Parafita R, Canudo A, Costa D, Vaz P. In vivo measurements for biokinetic and monte carlo simulations of absorbed dose in paediatric patients using radiopharmaceuticals. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.07.473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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82
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Mingrone F, Aberle O, Andrzejewski J, Audouin L, Bécares V, Bacak M, Balibrea-Correa J, Barbagallo M, Barros S, Bečvář F, Beinrucker C, Berthoumieux E, Billowes J, Bosnar D, Brugger M, Caamaño M, Calviño F, Calviani M, Cano-Ott D, Cardella R, Casanovas A, Castelluccio DM, Cerutti F, Chen Y, Chiaveri E, Colonna N, Cortés-Giraldo MA, Cortés G, Cosentino L, Damone L, Diakaki M, Domingo-Pardo C, Dressler R, Dupont E, Durán I, Fernández-Domínguez B, Ferrari A, Ferreira P, Finocchiaro P, Furman V, Ganesan S, Garcia-Rios AA, Gawlik A, Gheorghe I, Glodariu T, Gonçalves IF, Gonzàlez E, Goverdovski A, Griesmayer E, Guerrero C, Gunsing F, Göbel K, Harada H, Heftrich T, Heinitz S, Heyse J, Jenkins G, Jericha E, Käppeler F, Kadi Y, Katabuchi T, Kavrigin P, Ketlerov V, Khryachkov V, Kimura A, Kivel N, Kokkoris M, Krtička M, Leal-Cidoncha E, Lederer C, Leeb H, Lerendegui J, Lo Meo S, Lonsdale S, Losito R, Macina D, Marganiec J, Martínez T, Massimi C, Mastinu P, Mastromarco M, Matteucci F, Maugeri EA, Mendoza E, Mengoni A, Milazzo PM, Mirea M, Montesano S, Musumarra A, Nolte R, Oprea A, Patronis N, Pavlik A, Perkowski J, Praena J, Quesada JM, Rajeev K, Rauscher T, Reifarth R, Riego-Perez A, Rout P, Rubbia C, Ryan JA, Sabaté-Gilarte M, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Sedyshev P, Smith AG, Stamatopoulos A, Tagliente G, Tain JL, Tarifeño-Saldivia A, Tassan-Got L, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Vlachoudis V, Vlastou R, Wallner A, Warren S, Weigand M, Weiss C, Wolf C, Woods PJ, Wright T, Žugec P. The CERN n_TOF facility: a unique tool for nuclear data measurement. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201612205001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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83
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Ferreira P, Baptista M, Di Maria S, Vaz P. Cancer risk estimation in Digital Breast Tomosynthesis using GEANT4 Monte Carlo simulations and voxel phantoms. Phys Med 2016; 32:717-23. [PMID: 27133140 DOI: 10.1016/j.ejmp.2016.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 04/09/2016] [Accepted: 04/13/2016] [Indexed: 10/21/2022] Open
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84
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Leal-Cidoncha E, Durán I, Paradela C, Tarrío D, Leong L, Tassan-Got L, Audouin L, Altstadt S, Andrzejewski J, Barbagallo M, Bécares V, Bečvář F, Belloni F, Berthoumieux E, Billowes J, Boccone V, Bosnar D, Brugger M, Calviani M, Calviño F, Cano-Ott D, Carrapiço C, Cerutti F, Chiaveri E, Chin M, Colonna N, Cortés G, Cortés-Giraldo M, Diakaki M, Domingo-Pardo C, Dressler R, Dzysiuk N, Eleftheriadis C, Ferrari A, Fraval K, Ganesan S, García A, Giubrone G, Gómez-Hornillos M, Gonçalves I, González-Romero E, Griesmayer E, Guerrero C, Gunsing F, Gurusamy P, Hernández-Prieto A, Jenkins D, Jericha E, Kadi Y, Käppeler F, Karadimos D, Kivel N, Koehler P, Kokkoris M, Krtička M, Kroll J, Lampoudis C, Langer C, Lederer C, Leeb H, Lo Meo S, Losito R, Mallick A, Manousos A, Marganiec J, Martínez T, Massimi C, Mastinu P, Mastromarco M, Meaze M, Mendoza E, Mengoni A, Milazzo P, Mingrone F, Mirea M, Mondelaers W, Pavlik A, Perkowski J, Plompen A, Praena J, Quesada J, Rauscher T, Reifarth R, Riego A, Robles M, Roman F, Rubbia C, Sabaté-Gilarte M, Sarmento R, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Tagliente G, Tain J, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Versaci R, Vermeulen M, Vlachoudis V, Vlastou R, Wallner A, Ware T, Weigand M, Weiß C, Wright T, Žugec P. Fission Fragment Angular Distribution measurements of235U and238U at CERN n_TOF facility. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611110002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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85
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Diakaki M, Audouin L, Berthoumieux E, Calviani M, Colonna N, Dupont E, Duran I, Gunsing F, Leal-Cidoncha E, Le Naour C, Leong L, Mastromarco M, Paradela C, Tarrio D, Tassan-Got L, Aerts G, Altstadt S, Alvarez H, Alvarez-Velarde F, Andriamonje S, Andrzejewski J, Badurek G, Barbagallo M, Baumann P, Becares V, Becvar F, Belloni F, Berthier B, Billowes J, Boccone V, Bosnar D, Brugger M, Calvino F, Cano-Ott D, Capote R, Carrapiço C, Cennini P, Cerutti F, Chiaveri E, Chin M, Cortes G, Cortes-Giraldo M, Cosentino L, Couture A, Cox J, David S, Dillmann I, Domingo-Pardo C, Dressler R, Dridi W, Eleftheriadis C, Embid-Segura M, Ferrant L, Ferrari A, Finocchiaro P, Fraval K, Fujii K, Furman W, Ganesan S, Garcia A, Giubrone G, Gomez-Hornillos M, Goncalves I, Gonzalez-Romero E, Goverdovski A, Gramegna F, Griesmayer E, Guerrero C, Gurusamy P, Haight R, Heil M, Heinitz S, Igashira M, Isaev S, Jenkins D, Jericha E, Kadi Y, Kaeppeler F, Karadimos D, Karamanis D, Kerveno M, Ketlerov V, Kivel N, Kokkoris M, Konovalov V, Krticka M, Kroll J, Lampoudis C, Langer C, Lederer C, Leeb H, Lo Meo S, Losito R, Lozano M, Manousos A, Marganiec J, Martinez T, Marrone S, Massimi C, Mastinu P, Mendoza E, Mengoni A, Milazzo P, Mingrone F, Mirea M, Mondelaers W, Moreau C, Mosconi M, Musumarra A, O’Brien S, Pancin J, Patronis N, Pavlik A, Pavlopoulos P, Perkowski J, Perrot L, Pigni M, Plag R, Plompen A, Plukis L, Poch A, Pretel C, Praena J, Quesada J, Rauscher T, Reifarth R, Riego A, Roman F, Rudolf G, Rubbia C, Rullhusen P, Salgado J, Santos C, Sarchiapone L, Sarmento R, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Stephan C, Tagliente G, Tain J, Tavora L, Terlizzi R, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Versaci R, Vermeulen M, Villamarin D, Vincente M, Vlachoudis V, Vlastou R, Voss F, Wallner A, Walter S, Ware T, Weigand M, Weiß C, Wiesher M, Wisshak K, Wright T, Zugec P. Towards the high-accuracy determination of the238U fission cross section at the threshold region at CERN – n_TOF. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611102002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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86
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Paradela C, Duran I, Tassan-Got L, Audouin L, Berthier B, Isaev S, Le Naour C, Stephan C, Tarrío D, Abbondanno U, Aerts G, Álvarez-Pol H, Álvarez-Velarde F, Andriamonje S, Andrzejewski J, Badurek G, Baumann P, Becvar F, Berthoumieux E, Calviño F, Calviani M, Cano-Ott D, Capote R, Carrapiço C, Cennini P, Chepel V, Chiaveri E, Colonna N, Cortes G, Couture A, Cox J, Dahlfors M, David S, Dillmann I, Domingo-Pardo C, Dridi W, Eleftheriadis C, Embid-Segura M, Ferrant L, Ferrari A, Ferreira-Marques R, Fujii K, Furman W, Gonçalves I, Gonzalez-Romero E, Goverdovski A, Gramegna F, Guerrero C, Gunsing F, Haight R, Heil M, Igashira M, Jericha E, Kadi Y, Kaeppeler F, Karadimos D, Kerveno M, Ketlerov V, Koehler P, Konovalov V, Krticka M, Lampoudis C, Lederer C, Leeb H, Lindote A, Lukic S, Marganiec J, Martinez T, Marrone S, Massimi C, Mastinu P, Mengoni A, Milazzo P, Moreau C, Mosconi M, Pancin SJ, Pavlik A, Pavlopoulos P, Perrot L, Plag R, Plompen A, Plukis A, Poch A, Pretel C, Praena J, Quesada J, Rauscher T, Reifarth R, Rubbia C, Rudolf G, Rullhusen P, Salgado J, Santos C, Sarchiapone L, Savvidis I, Tagliente G, Tain J, Tavora L, Terlizzi R, Vaz P, Ventura A, Villamarin D, Vincente M, Vlachoudis V, Vlastou R, Voss F, Walter S, Weiss C, Wiesher M, Wisshak K. High accuracy235U(n,f) data in the resonance energy region. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611102003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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87
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Vaz P, Pereira T, Figueiras E, Correia C, Humeau-Heurtier A, Cardoso J. Which wavelength is the best for arterial pulse waveform extraction using laser speckle imaging? Biomed Signal Process Control 2016. [DOI: 10.1016/j.bspc.2015.11.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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88
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Pereira E, Quental L, Oliveira M, Raposinho P, Belchior A, Di Maria S, Correia I, Lavrado J, Mendes F, Vaz P, Santos I, Paulo A. Radiolabeled Acridine Orange (AO) Derivatives as DNA-Targeted Probes for Auger Therapy. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)30170-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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89
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Vaz P. Radiological protection, safety and security issues in the industrial and medical applications of radiation sources. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.05.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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90
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Figueira C, Di Maria S, Baptista M, Mendes M, Madeira P, Vaz P. Paediatric CT exposures: comparison between CTDI vol and SSDE methods using measurements and Monte Carlo simulations. RADIATION PROTECTION DOSIMETRY 2015; 165:210-215. [PMID: 25883302 DOI: 10.1093/rpd/ncv100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Computed tomography (CT) is one of the most used techniques in medical diagnosis, and its use has become one of the main sources of exposure of the population to ionising radiation. This work concentrates on the paediatric patients, since children exhibit higher radiosensitivity than adults. Nowadays, patient doses are estimated through two standard CT dose index (CTDI) phantoms as a reference to calculate CTDI volume (CTDI vol) values. This study aims at improving the knowledge about the radiation exposure to children and to better assess the accuracy of the CTDI vol method. The effectiveness of the CTDI vol method for patient dose estimation was then investigated through a sensitive study, taking into account the doses obtained by three methods: CTDI vol measured, CTDI vol values simulated with Monte Carlo (MC) code MCNPX and the recent proposed method Size-Specific Dose Estimate (SSDE). In order to assess organ doses, MC simulations were executed with paediatric voxel phantoms.
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91
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Baptista M, Di Maria S, Figueira C, Orvalho L, Vaz P. Determination of backscatter factors in breast tomosynthesis using MCNPX simulations and measurements. RADIATION PROTECTION DOSIMETRY 2015; 165:325-330. [PMID: 25836681 DOI: 10.1093/rpd/ncv102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The perspective of adding digital breast tomosynthesis (DBT) to standard mammography in screening raises concerns regarding the dose absorbed by the fibroglandular breast tissue. Thus, it is important to estimate accurately the mean glandular dose (MGD), although there are no standard protocols for dosimetry, concerning DBT. This study aims at introducing backscatter factors (BSF) to calculate the entrance surface air kerma (ESAK), directly on patients or phantoms, in order to be introduced in the formalism proposed by Dance et al. MCNPX simulations were performed, to mimic a DBT acquisition, for a wide range of X-ray spectra. A homogeneous breast phantom with 50 % of glandular tissue was considered and several thicknesses were evaluated. Dose measurements were performed, to validate and support the simulation results. The BSF may indicate a real MGD estimation in vivo for DBT examinations and contribute for the improvement of the current guidelines used in these applications.
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92
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Teles P, Barros S, Cardoso S, Facure A, da Rosa LAR, Santos M, Pereira P, Vaz P, Zankl M. A dosimetric study of prostate brachytherapy using Monte Carlo simulations with a voxel phantom, measurements and a comparison with a treatment planning procedure. RADIATION PROTECTION DOSIMETRY 2015; 165:482-487. [PMID: 25870437 DOI: 10.1093/rpd/ncv055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In prostate brachytherapy treatments, there is an initial swelling of the prostate of the patient due to an oedema related to the insertion of the seeds. The variation of the prostate volume can lead to variations in the final prescribed dose in treatment planning procedures. As such, it is important to understand their influence for dose optimisation purposes. This work reports on a dosimetric study of the swelling of the prostate in prostate brachytherapy using Monte Carlo simulations. Dosimetric measurements performed on a physical anthropomorphic tissue-equivalent prostate phantom and thermoluminescent dosimeters (TLDs) were used to validate the MC model. Finally the MC model was also used to simulate prostate swelling in a real treatment planning procedure. The obtained results indicate that the parameters mentioned above represent a source of uncertainty in dose assessment in prostate brachytherapy, and can be detrimental to a correct dose evaluation in treatment plannings, and that these parameters can be accurately determined by means of MC simulations with a voxel phantom.
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Baptista M, Figueira C, Teles P, Cardoso G, Zankl M, Vaz P. Assessment of the occupational exposure in real time during interventional cardiology procedures. RADIATION PROTECTION DOSIMETRY 2015; 165:304-309. [PMID: 25848113 DOI: 10.1093/rpd/ncv052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Interventional cardiology (IC) procedures can be complex, requiring the operators to work near the patient, during long exposure times. Owing to scattered radiation in the patient and the fluoroscopic equipment, the medical staff are exposed to a non-uniform radiation field and can receive high radiation doses. In this study, it is proposed to analyse staff doses obtained in real time, during IC procedures. A system for occupational dosimetry in real time was used. In order to identify some parameters that may affect the staff doses, Monte Carlo (MC) calculations, using MCNPX v.2.7.0 code and voxel phantoms, were performed. The data obtained from measurements, together with MC simulations, allowed the identification of actions and behaviours of the medical staff that could be considered a risk under routine working conditions. The implementation of this monitoring system for exposure of personnel may have a positive effect on optimisation of radiological protection in fluoroscopically guided cardiac procedures.
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94
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Marques T, Ribeiro A, Di Maria S, Belchior A, Cardoso J, Matela N, Oliveira N, Janeiro L, Almeida P, Vaz P. Effect of the glandular composition on digital breast tomosynthesis image quality and dose optimisation. RADIATION PROTECTION DOSIMETRY 2015; 165:337-341. [PMID: 25836692 DOI: 10.1093/rpd/ncv124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In the image quality assessment for digital breast tomosynthesis (DBT), a breast phantom with an average percentage of 50 % glandular tissue is seldom used, which may not be representative of the breast tissue composition of the women undergoing such examination. This work aims at studying the effect of the glandular composition of the breast on the image quality taking into consideration different sizes of lesions. Monte Carlo simulations were performed using the state-of-the-art computer program PENELOPE to validate the image acquisition system of the DBT equipment as well as to calculate the mean glandular dose for each projection image and for different breast compositions. The integrated PENELOPE imaging tool (PenEasy) was used to calculate, in mammography, for each clinical detection task the X-ray energy that maximises the figure of merit. All the 2D cranial-caudal projections for DBT were simulated and then underwent the reconstruction process applying the Simultaneous Algebraic Reconstruction Technique. Finally, through signal-to-noise ratio analysis, the image quality in DBT was assessed.
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95
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Mendes M, Costa F, Figueira C, Madeira P, Teles P, Vaz P. Assessment of patient dose reduction by bismuth shielding in CT using measurements, GEANT4 and MCNPX simulations. RADIATION PROTECTION DOSIMETRY 2015; 165:175-181. [PMID: 25813483 DOI: 10.1093/rpd/ncv059] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This work reports on the use of two different Monte Carlo codes (GEANT4 and MCNPX) for assessing the dose reduction using bismuth shields in computer tomography (CT) procedures in order to protect radiosensitive organs such as eye lens, thyroid and breast. Measurements were performed using head and body PMMA phantoms and an ionisation chamber placed in five different positions of the phantom. Simulations were performed to estimate Computed Tomography Dose Index values using GEANT4 and MCNPX. The relative differences between measurements and simulations were <10 %. The dose reduction arising from the use of bismuth shielding ranges from 2 to 45 %, depending on the position of the bismuth shield. The percentage of dose reduction was more significant for the area covered by the bismuth shielding (36 % for eye lens, 39 % for thyroid and 45 % for breast shields).
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96
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Baptista M, Di Maria S, Barros S, Figueira C, Sarmento M, Orvalho L, Vaz P. Dosimetric characterization and organ dose assessment in digital breast tomosynthesis: Measurements and Monte Carlo simulations using voxel phantoms. Med Phys 2015; 42:3788-800. [DOI: 10.1118/1.4921362] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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97
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Kulka U, Ainsbury L, Atkinson M, Barnard S, Smith R, Barquinero JF, Barrios L, Bassinet C, Beinke C, Cucu A, Darroudi F, Fattibene P, Bortolin E, Monaca SD, Gil O, Gregoire E, Hadjidekova V, Haghdoost S, Hatzi V, Hempel W, Herranz R, Jaworska A, Lindholm C, Lumniczky K, M'kacher R, Mörtl S, Montoro A, Moquet J, Moreno M, Noditi M, Ogbazghi A, Oestreicher U, Palitti F, Pantelias G, Popescu I, Prieto MJ, Roch-Lefevre S, Roessler U, Romm H, Rothkamm K, Sabatier L, Sebastià N, Sommer S, Terzoudi G, Testa A, Thierens H, Trompier F, Turai I, Vandevoorde C, Vaz P, Voisin P, Vral A, Ugletveit F, Wieser A, Woda C, Wojcik A. Realising the European network of biodosimetry: RENEB-status quo. RADIATION PROTECTION DOSIMETRY 2015; 164:42-5. [PMID: 25205835 PMCID: PMC4401036 DOI: 10.1093/rpd/ncu266] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Creating a sustainable network in biological and retrospective dosimetry that involves a large number of experienced laboratories throughout the European Union (EU) will significantly improve the accident and emergency response capabilities in case of a large-scale radiological emergency. A well-organised cooperative action involving EU laboratories will offer the best chance for fast and trustworthy dose assessments that are urgently needed in an emergency situation. To this end, the EC supports the establishment of a European network in biological dosimetry (RENEB). The RENEB project started in January 2012 involving cooperation of 23 organisations from 16 European countries. The purpose of RENEB is to increase the biodosimetry capacities in case of large-scale radiological emergency scenarios. The progress of the project since its inception is presented, comprising the consolidation process of the network with its operational platform, intercomparison exercises, training activities, proceedings in quality assurance and horizon scanning for new methods and partners. Additionally, the benefit of the network for the radiation research community as a whole is addressed.
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98
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Žugec P, Barbagallo M, Colonna N, Bosnar D, Altstadt S, Andrzejewski J, Audouin L, Bécares V, Bečvář F, Belloni F, Berthoumieux E, Billowes J, Boccone V, Brugger M, Calviani M, Calviño F, Cano-Ott D, Carrapiço C, Cerutti F, Chiaveri E, Chin M, Cortés G, Cortés-Giraldo M, Diakaki M, Domingo-Pardo C, Dressler R, Duran I, Dzysiuk N, Eleftheriadis C, Ferrari A, Fraval K, Ganesan S, García A, Giubrone G, Gómez-Hornillos M, Gonçalves I, González-Romero E, Griesmayer E, Guerrero C, Gunsing F, Gurusamy P, Heinitz S, Jenkins D, Jericha E, Kadi Y, Käppeler F, Karadimos D, Kivel N, Koehler P, Kokkoris M, Krtička M, Kroll J, Langer C, Lederer C, Leeb H, Leong L, Lo Meo S, Losito R, Manousos A, Marganiec J, Martínez T, Massimi C, Mastinu P, Mastromarco M, Meaze M, Mendoza E, Mengoni A, Milazzo P, Mingrone F, Mirea M, Mondalaers W, Paradela C, Pavlik A, Perkowski J, Pignatari M, Plompen A, Praena J, Quesada J, Rauscher T, Reifarth R, Riegov A, Roman F, Rubbia C, Sarmento R, Saxena A, Schillebeeckx P, Schmidt S, Schumann D, Tagliente G, Tain J, Tarrío D, Tassan-Got L, Tsinganis A, Valenta S, Vannini G, Variale V, Vaz P, Ventura A, Versaci R, Vermeulen M, Vlachoudis V, Vlastou R, Wallner A, Ware T, Weigand M, Weiß C, Wright T. Experimental neutron capture data of 58Ni from the CERN n_TOF facility. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159302009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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99
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Costa F, Teles P, Nogueira A, Barreto A, Santos A, Carvalho A, Martins B, Oliveira C, Gaspar C, Barros C, Neves D, Costa D, Rodrigues E, Godinho F, Alves F, Cardoso G, Cantinho G, Conde I, Vale J, Santos J, Isidoro J, Pereira J, Salgado L, Rézio M, Vieira M, Simãozinho P, Almeida P, Castro R, Parafita R, Pintão S, Lúcio T, Reis T, Vaz P. Estimation of the collective ionizing dose in the Portuguese population for the years 2011 and 2012, due to nuclear medicine exams. Rev Esp Med Nucl Imagen Mol 2015; 34:1-8. [DOI: 10.1016/j.remn.2014.03.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/28/2014] [Accepted: 03/31/2014] [Indexed: 10/25/2022]
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100
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Costa F, Teles P, Nogueira A, Barreto A, Santos A, Carvalho A, Martins B, Oliveira C, Gaspar C, Barros C, Neves D, Costa D, Rodrigues E, Godinho F, Alves F, Cardoso G, Cantinho G, Conde I, Vale J, Santos J, Isidoro J, Pereira J, Salgado L, Rézio M, Vieira M, Simãozinho P, Almeida P, Castro R, Parafita R, Pintão S, Lúcio T, Reis T, Vaz P. Estimation of the collective ionizing dose in the Portuguese population for the years 2011 and 2012, due to nuclear medicine exams. Rev Esp Med Nucl Imagen Mol 2015. [DOI: 10.1016/j.remnie.2014.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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