1
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Lépy MC, Thiam C, Anagnostakis M, Cosar C, de Blas A, Dikmen H, Duch MA, Galea R, Ganea ML, Hurtado S, Karfopoulos K, Luca A, Lutter G, Mitsios I, Persson H, Potiriadis C, Röttger S, Salpadimos N, Savva MI, Sima O, Thanh TT, Townson RW, Vargas A, Vasilopoulou T, Verheyen L, Vidmar T. A benchmark for Monte Carlo simulations in gamma-ray spectrometry Part II: True coincidence summing correction factors. Appl Radiat Isot 2024; 204:111109. [PMID: 38029636 DOI: 10.1016/j.apradiso.2023.111109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 10/31/2023] [Accepted: 11/07/2023] [Indexed: 12/01/2023]
Abstract
The goal of this study is to provide a benchmark for the use of Monte Carlo simulation when applied to coincidence summing corrections. The examples are based on simple geometries: two types of germanium detectors and four kinds of sources, to mimic eight typical measurement conditions. The coincidence corrective factors are computed for four radionuclides. The exercise input files and calculation results with practical recommendations are made available for new users on a dedicated webpage.
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Affiliation(s)
- M-C Lépy
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
| | - C Thiam
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - M Anagnostakis
- Nuclear Engineering Department, School of Mechanical Engineering, National Technical University of Athens, Iroon Polytechniou 9, 15780, Zografou, Athens, Greece
| | - C Cosar
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO-077125, Romania; Physics Department, University of Bucharest, 405 Atomistilor Str., Magurele, Ilfov County, RO-077125, Romania
| | - A de Blas
- Universitat Politècnica de Catalunya (UPC), Avda. Diagonal, 647, 08028, Barcelona, Spain
| | - H Dikmen
- TENMAK-NUKEN, Nuclear Energy Research Institute, Saray Mahallesi Atom Caddesi No:27, 06980 Kahramankazan, Ankara, Turkey
| | - M A Duch
- Universitat Politècnica de Catalunya (UPC), Avda. Diagonal, 647, 08028, Barcelona, Spain
| | - R Galea
- National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A0R6, Canada
| | - M L Ganea
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO-077125, Romania
| | - S Hurtado
- Dpto. Física Aplicada II, ETSA, Universidad de Sevilla, Avda. Reina Mercedes 2, 41012, Seville, Spain
| | - K Karfopoulos
- Greek Atomic Energy Commission (EEAE), Environmental Radioactivity Monitoring Unit, P.O. Box 60092, 153 10, Agia Paraskevi, Athens, Greece
| | - A Luca
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO-077125, Romania
| | - G Lutter
- European Commission, Joint Research Centre, Retieseweg 111, 2440, Geel, Belgium; Belgium and Department of Environmental Engineering, Technical University of Denmark, DTU, Risø Campus, 4000, Roskilde, Denmark
| | - I Mitsios
- Nuclear Engineering Department, School of Mechanical Engineering, National Technical University of Athens, Iroon Polytechniou 9, 15780, Zografou, Athens, Greece
| | - H Persson
- Mirion Technologies, Inc, 800 Research Parkway, Meriden, CT, 06450, USA
| | - C Potiriadis
- Greek Atomic Energy Commission (EEAE), Environmental Radioactivity Monitoring Unit, P.O. Box 60092, 153 10, Agia Paraskevi, Athens, Greece
| | - S Röttger
- Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany
| | - N Salpadimos
- Greek Atomic Energy Commission (EEAE), Environmental Radioactivity Monitoring Unit, P.O. Box 60092, 153 10, Agia Paraskevi, Athens, Greece
| | - M I Savva
- INRASTES, NCSR "Demokritos", P.O. Box 60037, 15310 Agia Paraskevi, Greece
| | - O Sima
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO-077125, Romania; Physics Department, University of Bucharest, 405 Atomistilor Str., Magurele, Ilfov County, RO-077125, Romania
| | - T T Thanh
- VNUHCM-University of Science, 227, Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam
| | - R W Townson
- National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A0R6, Canada
| | - A Vargas
- Universitat Politècnica de Catalunya (UPC), Avda. Diagonal, 647, 08028, Barcelona, Spain
| | - T Vasilopoulou
- INRASTES, NCSR "Demokritos", P.O. Box 60037, 15310 Agia Paraskevi, Greece
| | - L Verheyen
- SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, 2400, Mol, Belgium
| | - T Vidmar
- SCK-CEN, Belgian Nuclear Research Centre, Boeretang 200, 2400, Mol, Belgium
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Bobin C, Thiam C, M'Hayham MD, Mougeot X. Activity standardization of 60Co and 106Ru/ 106Rh by means of the TDCR method and the importance of the beta spectrum. Appl Radiat Isot 2023; 201:110993. [PMID: 37651916 DOI: 10.1016/j.apradiso.2023.110993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/13/2023] [Accepted: 08/18/2023] [Indexed: 09/02/2023]
Abstract
Atomic and nuclear data represent an important input for the accuracy of primary activity measurements based on liquid scintillation. In particular, the reliability of β-spectrum computation has been investigated for several years through experimental and theoretical studies providing solid evidence for the need to consider the atomic effects. In the present study, the activity standardization of two β-emitting radionuclides (60Co, 106Ru/106Rh) was carried out by means of the 4πβ-γ coincidence and Triple-to-Double Coincidence Ratio (TDCR) methods. The comparison between the activity concentrations given by both primary techniques presents new evidence that a better agreement is obtained when the exchange and screening effects are included in the β-spectra implemented in the model of light emission for TDCR measurements. A new development of a stochastic model based on Geant4 simulations for TDCR calculations is also presented.
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Affiliation(s)
- C Bobin
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
| | - C Thiam
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - M-D M'Hayham
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - X Mougeot
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
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Sonfo B, Camara Y, Thiam C, Konaté M, Maiga AK, Sacko M, Sangaré I, Touré M, Sidibé S, Sangaré Z, Camara M, Daffé S, Ba HO, Mariko S, Coulibaly S, Menta I, Diall I, Diarra MB. [Epidemiological and clinical aspects of atrial fibrillation at the cardiology department of kati university hospital]. Mali Med 2022; 37:32-35. [PMID: 38196251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
Atrial fibrillation is the most frequent permanent rhythm disorder.Theaim of this work was to determine the epidemiological and clinical aspects of atrial fibrillation cases hospitalized in the cardiology department of the University Hospital of Kati. MATERIALS AND METHODS We carried out a descriptive retrospective study, from January 2018 to December 2019.Patients of all ages and both sexes with clinical and EKG atrial fibrillation admitted to the department during the study period were included in the study.The variables studiedwere: socio-demographic characteristics, clinical signs, classification of atrial fibrillation, and comorbidities associated. RESULTS A total of 52 patients were included in the studyof 203 cases hospitalized in the department, with a hospital prevalence of 25.61%, the female sex was predominant 69.23%. The main reason for consultation was heart failure syndrome (46.15%).Arterial hypertension (55.76%) was the mostassociatedcomorbidity. Permanent atrial fibrillation accounted for 63.46% of cases . CONCLUSION Atrial fibrillation is the most frequent arrhythmia in our environment, preventive measures must be put in place for early detection and better management of comorbiditiesassociatedwith atrial fibrillation.
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Affiliation(s)
- B Sonfo
- Service de Cardiologie CHU de Kati
| | - Y Camara
- Service de Cardiologie CHU de Kati
| | - C Thiam
- Service de Cardiologie CHU de Kati
| | - M Konaté
- Service de Médecine de l'Hôpital du Mali
| | - A K Maiga
- Service de Cardiologie CHUME « le Luxembourg »
| | - M Sacko
- Service de Cardiologie CHU du Point G
| | - I Sangaré
- Service de Cardiologie CHU « Gabriel Touré »
| | - M Touré
- Service de Cardiologie CHU « Gabriel Touré »
| | - S Sidibé
- Service de Cardiologie CHU du Point G
| | - Z Sangaré
- Service de Cardiologie de l'Hôpital Mère-Enfant de Kayes
| | - M Camara
- Service de Cardiologie CHU de Kati
| | - S Daffé
- Service de Cardiologie CHUME « le Luxembourg »
| | - H O Ba
- Service de Cardiologie CHU « Gabriel Touré »
| | - S Mariko
- Service de Medecine De l'Hôpital de Tombouctou
| | | | - I Menta
- Service de Cardiologie CHU « Gabriel Touré »
| | - I Diall
- Service de Cardiologie CHU du Point G
| | - M B Diarra
- Service de Cardiologie CHUME « le Luxembourg »
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Kellett MA, Vio L, Bobin C, Brondeau L, Cardot-Martin M, Isnard H, Lacour D, Lépy MC, Lourenço V, Marie M, Thiam C. Measurement of the absolute gamma-ray emission intensities from the decay of 147Nd. Appl Radiat Isot 2020; 166:109349. [PMID: 32818806 DOI: 10.1016/j.apradiso.2020.109349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 07/06/2020] [Accepted: 07/20/2020] [Indexed: 10/23/2022]
Abstract
The 2011 Decay Data Evaluation Project (DDEP) evaluation for 147Nd includes recommended absolute emission intensities for the two main gamma-rays at 91.105 (2) keV and 531.016 (22) keV of 0.284 (18) and 0.127 (9) respectively, i.e. with uncertainties of 6.3% and 7.1%. These large uncertainties stem from inconsistencies in the published data and are unfit for modern purposes, since the production of 147Nd is used as an important neutron flux dosimeter. The LNE-LNHB has undertaken new absolute gamma-ray emission intensity measurements. The results of these measurements will be presented, along with a full uncertainty budget, and their effect on the recommended data uncertainties will be discussed.
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Affiliation(s)
- M A Kellett
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France.
| | - L Vio
- CEA, DEN, Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire (LANIE), Bât. 391 PC33, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - C Bobin
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - L Brondeau
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M Cardot-Martin
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - H Isnard
- CEA, DEN, Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire (LANIE), Bât. 391 PC33, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - D Lacour
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M Marie
- CEA, DEN, Laboratoire de développement Analytique Nucléaire Isotopique et Elémentaire (LANIE), Bât. 391 PC33, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - C Thiam
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
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Bobin C, Bouchard J, Chisté V, Collins SM, Dryák P, Fenwick A, Keightley J, Lépy MC, Lourenço V, Robinson AP, Sochorová J, Šolc J, Thiam C. Activity measurements and determination of nuclear decay data of 166Ho in the MRTDosimetry project. Appl Radiat Isot 2019; 153:108826. [PMID: 31525708 DOI: 10.1016/j.apradiso.2019.108826] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 07/23/2019] [Accepted: 07/26/2019] [Indexed: 11/19/2022]
Abstract
Holmium-166 is a high-energy β--emitter radionuclide (~ 1.8 MeV) with a short half-life (~26.8h) that offers great potential as an alternative to 90Y for the treatment of liver cancer based on radioembolization. The possibility of quantitative Single Photon Emission Computed Tomography (SPECT) imaging of the main γ-ray emission at 80.6 keV, in addition to strong paramagnetic properties suitable for Magnetic Resonance Imaging (MRI), complement this therapeutic potential. The present paper describes the measurements carried out in three European radionuclide metrology laboratories for primary standardization of 166Ho and new determinations of X- and γ-ray photon-emission intensities in the framework of the European EMPIR project MRTDosimetry. New half-life measurements were also performed.
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Affiliation(s)
- C Bobin
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France.
| | - J Bouchard
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France
| | - V Chisté
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France
| | - S M Collins
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - P Dryák
- Czech Metrology Institute, Okruzni 31, 638 00, Brno, Czech Republic
| | - A Fenwick
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - J Keightley
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France
| | - A P Robinson
- National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom; University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom; Christie Medical Physics and Engineering (CMPE), The Christie NHS Foundation Trust, Wilmslow Road, M20 4BX, Manchester, United Kingdom
| | - J Sochorová
- Czech Metrology Institute, Okruzni 31, 638 00, Brno, Czech Republic
| | - J Šolc
- Czech Metrology Institute, Okruzni 31, 638 00, Brno, Czech Republic
| | - C Thiam
- CEA, LIST, Laboratoire National Henri Becquerel, (LNE-LNHB), 91191, Gif-sur-Yvette Cedex, France
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Lépy MC, Thiam C, Anagnostakis M, Galea R, Gurau D, Hurtado S, Karfopoulos K, Liang J, Liu H, Luca A, Mitsios I, Potiriadis C, Savva MI, Thanh TT, Thomas V, Townson RW, Vasilopoulou T, Zhang M. A benchmark for Monte Carlo simulation in gamma-ray spectrometry. Appl Radiat Isot 2019; 154:108850. [PMID: 31476556 DOI: 10.1016/j.apradiso.2019.108850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 07/04/2019] [Accepted: 08/08/2019] [Indexed: 10/26/2022]
Abstract
Monte Carlo (MC) simulation is widely used in gamma-ray spectrometry, however, its implementation is not always easy and can provide erroneous results. The present action provides a benchmark for several MC software for selected cases. The examples are based on simple geometries, two types of germanium detectors and four kinds of sources, to mimic eight typical measurement conditions. The action outputs (input files and efficiency calculation results, including practical recommendations for new users) are made available on a dedicated webpage.
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Affiliation(s)
- M C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay 91191 Gif-sur-Yvette Cedex, France.
| | - C Thiam
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay 91191 Gif-sur-Yvette Cedex, France
| | - M Anagnostakis
- Nuclear Engineering Department, National Technical University of Athens, 15870 Athens, Greece
| | - R Galea
- National Research Council of Canada - 1200 Montreal Road - Ottawa ON, K1A0R6, Canada
| | - D Gurau
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO, 077125, Romania
| | - S Hurtado
- Universidad de Sevilla, Servicio de Radioisotopos, CITIUS, Avda. Reina Mercedes 4, SP-41012, Sevilla, Spain
| | - K Karfopoulos
- Greek Atomic Energy Commission EEAE- Patriarchou Grigorio & Neapoleos - P.O. Box 60092- P.C. 15341, Agia Paraskevi, Athens, Greece
| | - J Liang
- Ionizing Radiation Devision National Institute of Metrology, No.18, Bei San Huan Dong Lu, Chao Yang District, Beijing, China
| | - H Liu
- Ionizing Radiation Devision National Institute of Metrology, No.18, Bei San Huan Dong Lu, Chao Yang District, Beijing, China
| | - A Luca
- Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, PO Box MG-6, Magurele, Ilfov County, RO, 077125, Romania
| | - I Mitsios
- Nuclear Engineering Department, National Technical University of Athens, 15870 Athens, Greece
| | - C Potiriadis
- Greek Atomic Energy Commission EEAE- Patriarchou Grigorio & Neapoleos - P.O. Box 60092- P.C. 15341, Agia Paraskevi, Athens, Greece
| | - M I Savva
- INRASTES, NCSR "DEMOKRITOS" - Terma Patriarchou Grigoriou & Neapoleos - 153 10 Ag. Paraskevi, Athens, Greece
| | - T T Thanh
- University of Science, VNU-HCM, Faculty of Physics & Engineering Physics, Department of Nuclear Physics-Nuclear Engineering, 227, Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City, Viet Nam
| | - V Thomas
- CEA, DAM, DIF, F-91297, Arpajon, France
| | - R W Townson
- National Research Council of Canada - 1200 Montreal Road - Ottawa ON, K1A0R6, Canada
| | - T Vasilopoulou
- INRASTES, NCSR "DEMOKRITOS" - Terma Patriarchou Grigoriou & Neapoleos - 153 10 Ag. Paraskevi, Athens, Greece
| | - M Zhang
- Ionizing Radiation Devision National Institute of Metrology, No.18, Bei San Huan Dong Lu, Chao Yang District, Beijing, China
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Bobin C, Thiam C, Bouchard J. Standardization of 68Ge/ 68Ga using the 4πβ-γ coincidence method based on Cherenkov counting. Appl Radiat Isot 2018; 134:252-256. [PMID: 28676277 DOI: 10.1016/j.apradiso.2017.06.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 06/26/2017] [Accepted: 06/28/2017] [Indexed: 11/25/2022]
Abstract
In the framework of an international BIPM comparison (Bureau International des Poids et Mesures), the activity standardization of 68Ge in a solution of 68Ge/68Ga in equilibrium provided by NIST was carried out at LNHB. This exercise was organized to meet the growing interest in 68Ga as a radiopharmaceutical in nuclear medicine services (e.g. as a surrogate of 18F for PET imaging). Due to the volatility of germanium, the activity standardization of 68Ge was investigated at LNHB by means of 4πβ-γ coincidence counting based on Cherenkov measurements. This technique was applied to take advantage of the Cherenkov threshold (~ 260keV in aqueous solutions) in order to prevent counting from electron-capture events associated with 68Ge disintegrations. Cherenkov counting was performed using glass and polyethylene vials and the resulting activity concentrations were compared with 4πβ-γ coincidence measurements based on liquid scintillation. The efficiency-extrapolation curve obtained with Cherenkov measurements in glass vials was compared to Monte Carlo simulations based on the Geant4 code.
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Affiliation(s)
- C Bobin
- CEA, LIST, Laboratoire national Henri Becquerel, (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France.
| | - C Thiam
- CEA, LIST, Laboratoire national Henri Becquerel, (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - J Bouchard
- CEA, LIST, Laboratoire national Henri Becquerel, (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
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Bobin C, Bichler O, Lourenço V, Thiam C, Thévenin M. Real-time radionuclide identification in γ-emitter mixtures based on spiking neural network. Appl Radiat Isot 2015; 109:405-409. [PMID: 26706284 DOI: 10.1016/j.apradiso.2015.12.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 12/04/2015] [Indexed: 11/29/2022]
Abstract
Portal radiation monitors dedicated to the prevention of illegal traffic of nuclear materials at international borders need to deliver as fast as possible a radionuclide identification of a potential radiological threat. Spectrometry techniques applied to identify the radionuclides contributing to γ-emitter mixtures are usually performed using off-line spectrum analysis. As an alternative to these usual methods, a real-time processing based on an artificial neural network and Bayes' rule is proposed for fast radionuclide identification. The validation of this real-time approach was carried out using γ-emitter spectra ((241)Am, (133)Ba, (207)Bi, (60)Co, (137)Cs) obtained with a high-efficiency well-type NaI(Tl). The first tests showed that the proposed algorithm enables a fast identification of each γ-emitting radionuclide using the information given by the whole spectrum. Based on an iterative process, the on-line analysis only needs low-statistics spectra without energy calibration to identify the nature of a radiological threat.
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Affiliation(s)
- C Bobin
- CEA, LIST, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - O Bichler
- CEA, LIST, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - V Lourenço
- CEA, LIST, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - C Thiam
- CEA, LIST, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - M Thévenin
- CEA, LIST, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France.
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Bobin C, Thiam C, Bouchard J. Calculation of extrapolation curves in the 4π(LS)β-γ coincidence technique with the Monte Carlo code Geant4. Appl Radiat Isot 2015; 109:319-324. [PMID: 26699674 DOI: 10.1016/j.apradiso.2015.12.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 12/04/2015] [Indexed: 11/26/2022]
Abstract
At LNE-LNHB, a liquid scintillation (LS) detection setup designed for Triple to Double Coincidence Ratio (TDCR) measurements is also used in the β-channel of a 4π(LS)β-γ coincidence system. This LS counter based on 3 photomultipliers was first modeled using the Monte Carlo code Geant4 to enable the simulation of optical photons produced by scintillation and Cerenkov effects. This stochastic modeling was especially designed for the calculation of double and triple coincidences between photomultipliers in TDCR measurements. In the present paper, this TDCR-Geant4 model is extended to 4π(LS)β-γ coincidence counting to enable the simulation of the efficiency-extrapolation technique by the addition of a γ-channel. This simulation tool aims at the prediction of systematic biases in activity determination due to eventual non-linearity of efficiency-extrapolation curves. First results are described in the case of the standardization (59)Fe. The variation of the γ-efficiency in the β-channel due to the Cerenkov emission is investigated in the case of the activity measurements of (54)Mn. The problem of the non-linearity between β-efficiencies is featured in the case of the efficiency tracing technique for the activity measurements of (14)C using (60)Co as a tracer.
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Affiliation(s)
- C Bobin
- CEA, LIST, Laboratoire National Henri Becquerel, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France.
| | - C Thiam
- CEA, LIST, Laboratoire National Henri Becquerel, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - J Bouchard
- CEA, LIST, Laboratoire National Henri Becquerel, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France
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Lourenço V, Bobin C, Chisté V, Thiam C, Lacour D, Rigoulay F, Ferreux L. Standardization of 90Y-labelled SIR-Spheres used for selective internal radiotherapy. Phys Med 2015. [DOI: 10.1016/j.ejmp.2015.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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11
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Menta I, Bâ HO, Dimzoré S, Kéita A, Thiam C, Traoré D, Daffe S, Touré M, Diarra MB. [A descriptive study of ventricular septal defect (VSD) in the Luxembourg mother-child Hospital in Bamako]. Mali Med 2015; 30:34-37. [PMID: 29927156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE This work aimed to determine the incidence, epidemiological, clinical, echocardiographic aspects, and treatment of ventricular septal defect (VSD) in the Luxembourg mother-child Hospital in Bamako. METHOD A descriptive cross-sectional study was conducted between September 1, 2011 and May 31, 2012. It focused on children of both sexes seen in consultation or for echocardiography, in whom VSD was found through echocardiography. Were not included in the study VSD in complex malformations such as CAV, T4F, VU. RESULTS VSD was the first congenital heart disease noted with 39.4%. It was detected mainly in the first 2 years of life (66.7% of cases). The boy:girl sex ratio was 0.93. The perimembranous defect type and the VSD group II were dominant with respectively 76.8% and 57.4% of cases (IIa: 38.9%; IIb: 18.5%). A surgical indication was raised in 59.3% of cases based on clinical presentation and ultrasound data. Management was primarily medical, the high cost of surgical through evacuation is beyond the financial means of our patients most of the time. CONCLUSION VSD is the most common congenital heart disease, but its management is currently almost exclusively medical.
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Affiliation(s)
- I Menta
- Service de Cardiologie CHU Gabriel Touré
| | - H O Bâ
- Service de Cardiologie CHU Gabriel Touré
| | - S Dimzoré
- Service de Cardiologie Centre Hospitalier Mère Enfant
| | - A Kéita
- Service de Cardiologie Centre Hospitalier Mère Enfant
| | - C Thiam
- Service de Cardiologie Centre Hospitalier Mère Enfant
| | - D Traoré
- Service de Médecine Interne et d'Endocrinologie Hôpital du Mali
| | - S Daffe
- Service de Cardiologie Centre Hospitalier Mère Enfant
| | - M Touré
- Service de Cardiologie CHU Gabriel Touré
| | - M B Diarra
- Service de Cardiologie Centre Hospitalier Mère Enfant
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12
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Lourenço V, Bobin C, Chisté V, Lacour D, Rigoulay F, Tapner M, Thiam C, Ferreux L. Primary standardization of SIR-Spheres based on the dissolution of the (90)Y-labeled resin microspheres. Appl Radiat Isot 2014; 97:170-176. [PMID: 25579458 DOI: 10.1016/j.apradiso.2014.12.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/08/2014] [Accepted: 12/23/2014] [Indexed: 10/24/2022]
Abstract
The project "Metrology for molecular radiotherapy" is a collaborative European project initiated to bring together expertize in ionizing radiation metrology and nuclear medicine research. This project deals with the development of personalized dosimetry to individual patients who are undergoing molecular radiotherapy (also known as targeted radionuclide therapy). The general aim is to provide a metrological traceability to primary standards for individual dosimetry in the case of molecular radiotherapy. In particular, one objective is the standardization of (90)Y-labeled resin microspheres SIR-Spheres (Sirtex, Sydney, Australia) used for the treatment of liver cancer by radioembolization. The present paper describes the primary measurements carried out using the Triple to Double Coincidence Ratio (TDCR) method applied after the complete dissolution of the SIR-Spheres in the Sirtex vial. A method for the dissolution was developed to optimize the homogeneity of the solution to enable the primary measurements based on Cherenkov and liquid scintillation counting. A comprehensive description of the protocol implemented for the microsphere dissolution is reported. First calibration factors obtained with the reference ionization chambers at LNE-LNHB are also given.
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Affiliation(s)
- V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
| | - C Bobin
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France.
| | - V Chisté
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
| | - D Lacour
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
| | - F Rigoulay
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
| | | | - C Thiam
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
| | - L Ferreux
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette Cedex, France
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Halter E, Thiam C, Bobin C, Bouchard J, Chambellan D, Chauvenet B, Hamel M, Rocha L, Trocmé M, Woo R. First TDCR measurements at low energies using a miniature x-ray tube. Appl Radiat Isot 2014; 93:7-12. [PMID: 24685767 DOI: 10.1016/j.apradiso.2014.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 02/26/2014] [Accepted: 03/10/2014] [Indexed: 10/25/2022]
Abstract
Developed for radionuclide standardization using liquid scintillation, the Triple to Double Coincidence Ratio (TDCR) method is applied using coincidence counting obtained with a specific three-photomultiplier system. For activity determination, a statistical model of light emission is classically used to establish a relation between the detection efficiency and the experimental TDCR value. At LNE-LNHB, a stochastic approach of the TDCR modeling was developed using the Monte Carlo code Geant4. The interest of this TDCR-Geant4 model is the possibility to simulate the propagation of optical photons from their creation in the scintillation vial to the production of photoelectrons in photomultipliers. As an alternative to the use of radionuclide sources, first TDCR measurements are presented using a miniature x-ray tube closely coupled to the scintillation vial. The objective of this new set-up was to enable low-energy depositions (lower than 20 keV) in liquid scintillator in order to study the influence of both time and geometrical dependence between PMTs already observed with radioactive sources. As for the statistical TDCR model, the non-linearity of light emission is implemented in the TDCR-Geant4 model using the Birks formula which depends on the kB factor and the scintillation yield. Measurements performed with the x-ray tube are extended to the assessment of these parameters and they are tested afterwards in the TDCR-Geant4 model for activity measurements of (3)H.
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Affiliation(s)
- E Halter
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France; CEA, List, Laboratoire Capteurs et Architectures Electroniques, 91191 Gif-sur-Yvette Cedex, France
| | - C Thiam
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - C Bobin
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France.
| | - J Bouchard
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - D Chambellan
- CEA, List, Laboratoire Images, Tomographie et Traitements, 91191 Gif-sur-Yvette Cedex, France
| | - B Chauvenet
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - M Hamel
- CEA, List, Laboratoire Capteurs et Architectures Electroniques, 91191 Gif-sur-Yvette Cedex, France
| | - L Rocha
- CEA, List, Laboratoire Capteurs et Architectures Electroniques, 91191 Gif-sur-Yvette Cedex, France
| | - M Trocmé
- CEA, List, Laboratoire Capteurs et Architectures Electroniques, 91191 Gif-sur-Yvette Cedex, France
| | - R Woo
- CEA, List, Laboratoire Capteurs et Architectures Electroniques, 91191 Gif-sur-Yvette Cedex, France
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Thiam C, Le Quan Sang K, Aegerter P, Ou P, Nuel G, Thalabard JC. Évaluation comparative de deux procédures diagnostiques multi-dimensionnelles, corrélées, en absence de gold standard : application au suivi d’enfants opérés du cœur (TGVs). Rev Epidemiol Sante Publique 2014. [DOI: 10.1016/j.respe.2013.12.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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15
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Bobin C, Bouchard J, Thiam C, Ménesguen Y. Digital pulse processing and optimization of the front-end electronics for nuclear instrumentation. Appl Radiat Isot 2013; 87:195-9. [PMID: 24326314 DOI: 10.1016/j.apradiso.2013.11.090] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 11/23/2013] [Indexed: 11/28/2022]
Abstract
This article describes an algorithm developed for the digital processing of signals provided by a high-efficiency well-type NaI(Tl) detector used to apply the 4πγ technique. In order to achieve a low-energy threshold, a new front-end electronics has been specifically designed to optimize the coupling to an analog-to-digital converter (14 bit, 125 MHz) connected to a digital development kit produced by Altera(®). The digital pulse processing is based on an IIR (Infinite Impulse Response) approximation of the Gaussian filter (and its derivatives) that can be applied to the real-time processing of digitized signals. Based on measurements obtained with the photon emissions generated by an (241)Am source, the energy threshold is estimated to be equal to ~2 keV corresponding to the physical threshold of the NaI(Tl) detector. An algorithm developed for a Silicon Drift Detector used for low-energy x-ray spectrometry is also described. In that case, the digital pulse processing is specifically designed for signals provided by a reset-type preamplifier ((55)Fe source).
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Affiliation(s)
- C Bobin
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91191 Gif-sur-Yvette Cedex, France.
| | - J Bouchard
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91191 Gif-sur-Yvette Cedex, France
| | - C Thiam
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91191 Gif-sur-Yvette Cedex, France
| | - Y Ménesguen
- CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91191 Gif-sur-Yvette Cedex, France
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Bobin C, Bouchard J, Pierre S, Thiam C. Overview of a FPGA-based nuclear instrumentation dedicated to primary activity measurements. Appl Radiat Isot 2012; 70:2012-7. [DOI: 10.1016/j.apradiso.2012.02.068] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Accepted: 02/19/2012] [Indexed: 11/24/2022]
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Bobin C, Thiam C, Chauvenet B, Bouchard J. On the stochastic dependence between photomultipliers in the TDCR method. Appl Radiat Isot 2012; 70:770-80. [PMID: 22244195 DOI: 10.1016/j.apradiso.2011.12.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 12/02/2011] [Accepted: 12/15/2011] [Indexed: 10/14/2022]
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Diarena M, Nowak S, Boire JY, Bloch V, Donnarieix D, Fessy A, Grenier B, Irrthum B, Legré Y, Maigne L, Salzemann J, Thiam C, Spalinger N, Verhaeghe N, de Vlieger P, Breton V. HOPE, an open platform for medical data management on the grid. Stud Health Technol Inform 2008; 138:34-48. [PMID: 18560106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The paper describes a platform developed for the secure management and analysis of medical data and images in a grid environment. Designed for telemedicine and built upon the EGEE gLite middleware and particularly the metadata catalogue AMGA as well as the GridSphere web portal, the platform provides to healthcare professionals the capacity to upload and query medical information stored over distributed servers. A job submission environment is also available for data analysis. Security features include authentication and authorization by grid certificates, anonymization of medical data and image encryption. The platform is currently deployed on several sites in Europe and Asia and is being customized for applications in the field of telemedicine and medical physics.
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Affiliation(s)
- M Diarena
- LPC Clermont-Ferrand, Université Blaise Pascal, CNRS-IN2P3, campus des Cézeaux, 63177 Aubière cedex, France
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Camara B, Diack B, Diouf S, Signate-Sy H, Sall MG, Ba M, Sarr M, Hanne K, Thiam C, Diouf L. [Low birth weight: rate and risk factors in the Guédianwaye district (suburb of Dakar, Senegal)]. Dakar Med 1998; 40:213-9. [PMID: 9827084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The authors report the results of a six months survey about the low weight of birth (L.W.B.) in the district of Guédiawaye, suburb of Dakar. The purpose is to determine the rate of L.W.B. in two main maternity hospitals of that locality and the associated risk factors. It is a survey with a control group. This survey results in a 10.7% rate, according to the data of another retrospective survey in the same maternity hospitals in 1992 (10.03%). The risk factors are mainly: celibacy, primiparity, an associated pathology with the pregnancy, the physical strain of mothers correlated to the income and to the previous L.W.B.
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Affiliation(s)
- B Camara
- l'Institut de Pédiatrie Sociale, Université C.A.D. Dakar, Sénégal
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