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Tüzün D, Chambon L, Kergadallan Y, Lourenço V. Novel production method for traceable surface sources by aluminium functionalisation. Appl Radiat Isot 2023; 202:111045. [PMID: 37804800 DOI: 10.1016/j.apradiso.2023.111045] [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: 06/20/2023] [Revised: 08/26/2023] [Accepted: 09/22/2023] [Indexed: 10/09/2023]
Abstract
Accurate detection of low-level radioactivity is critical in decommissioning. However, commercial sources used for calibration lack representativeness due to their flat surface. The objective of this work is to produce flexible and large area surface sources for alpha and beta emitters by functionalising aluminium foil. Functionalisation strategies were developed to provide these sources. The manganese oxide coated sample shows the highest fixation yield for 241Am: (70.0 ± 2.6)% and conforms to ISO 8769 for uniformity (92%).
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Affiliation(s)
- D Tüzün
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - L Chambon
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - Y Kergadallan
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France
| | - V Lourenço
- Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
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2
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Monteiro S, Dias J, Lourenço V, Partidário A, Lageiro M, Lampreia C, Fernandes J, Lidon F, Reboredo F, Alvarenga N. Development of a Functional Dark Chocolate with Baobab Pulp. Foods 2023; 12:foods12081711. [PMID: 37107506 PMCID: PMC10137990 DOI: 10.3390/foods12081711] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/13/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
In recent years, cocoa and dark chocolate have attracted the interest of consumers not only for their sensory characteristics but also for their nutritional properties and positive impact on health. The baobab is a fruit of African origin with a sour and slightly sweet flavour, widely consumed by local communities due to its unique nutritional features. The aim of this work was to evaluate the impact of the concentration of baobab flour in the development of functional dark chocolate, including physical, chemical, nutritional and sensory evaluations. The results presented a positive correlation between the incorporation of baobab flour and the antioxidant activity (up to 2297 mmol TE/100 g), vitamin C content (up to 49.7 mg/100 g), calcium (up to 1052 mg/kg), potassium (up to 10,175 mg/kg), phosphorus (up to 795.9 mg/kg), chlorine (up to 235.4 mg/kg) and sulphur (up to 1158 mg/kg). The sensory evaluation of dark chocolate with 3% baobab presented the highest evaluation on the parameters "texture" and "overall flavour", while the parameter "overall flavour" presented the lowest evaluation on chocolate with 9% baobab. No influence was observed on fatty acid profile, protein, fat and hardness.
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Affiliation(s)
- Sara Monteiro
- Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - João Dias
- Instituto Politécnico de Beja, Escola Superior Agrária, Rua Pedro Soares, 7800-295 Beja, Portugal
- GeoBioTec Research Center, Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Vanda Lourenço
- Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- Center for Mathematics and Applications (NOVA Math), Department of Mathematics, NOVA SST, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Ana Partidário
- UTI, Instituto Nacional de Investigação Agrária e Veterinária IP, Quinta do Marquês, 2780-157 Oeiras, Portugal
| | - Manuela Lageiro
- GeoBioTec Research Center, Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- UTI, Instituto Nacional de Investigação Agrária e Veterinária IP, Quinta do Marquês, 2780-157 Oeiras, Portugal
| | - Célia Lampreia
- Instituto Politécnico de Beja, Escola Superior Agrária, Rua Pedro Soares, 7800-295 Beja, Portugal
| | - Jaime Fernandes
- Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Fernando Lidon
- Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- GeoBioTec Research Center, Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Fernando Reboredo
- Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- GeoBioTec Research Center, Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Nuno Alvarenga
- GeoBioTec Research Center, Faculdade de Ciências e Tecnologia, Campus da Caparica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- UTI, Instituto Nacional de Investigação Agrária e Veterinária IP, Quinta do Marquês, 2780-157 Oeiras, Portugal
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3
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Lita da Silva J, Lourenço V. Convergence of series of moments on general exponential inequality. STATISTICS-ABINGDON 2022. [DOI: 10.1080/02331888.2022.2038163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- João Lita da Silva
- Department of Mathematics and GeoBioTec, NOVA School of Sciences and Technology, NOVA University of Lisbon, Caparica, Portugal
| | - Vanda Lourenço
- Department of Mathematics and CMA, NOVA School of Sciences and Technology, NOVA University of Lisbon, Caparica, Portugal
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Riffaud J, Lépy MC, Cassette P, Corbel M, Kellett MA, Lourenço V. Measurement of the absolute gamma-ray emission intensities from the decay of 103Pd. Appl Radiat Isot 2020; 167:109298. [PMID: 33010791 DOI: 10.1016/j.apradiso.2020.109298] [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: 04/19/2019] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 11/25/2022]
Abstract
Palladium-103 decays through electron capture to excited levels of 103Rh, and especially to the 39.748-keV metastable state. A high activity palladium chloride solution was standardized by liquid scintillation, using the Triple-to-Double Coincidence Ratio method. The absolute photon emission intensities were determined by gamma-ray spectrometry using point sources prepared with the standard solution. Different detectors and measuring conditions were used to cross-reference the results. The most intense photon emission intensities are derived with about 1% relative combined standard uncertainty.
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Affiliation(s)
- J Riffaud
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France.
| | - P Cassette
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M Corbel
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - M A Kellett
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), Bât. 602 PC 111, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
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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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6
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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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Riffaud J, Cassette P, Lacour D, Lourenço V, Tartès I, Kellett MA, Corbel M, Lépy MC, Domergue C, Destouches C, Carcreff H, Vigneau O. Measurement of absolute K X-ray emission intensities in the decay of 103mRh. Appl Radiat Isot 2018; 134:399-405. [PMID: 29031491 DOI: 10.1016/j.apradiso.2017.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 03/30/2017] [Revised: 10/02/2017] [Accepted: 10/02/2017] [Indexed: 10/18/2022]
Abstract
A new experiment was designed to measure the photon emission intensities in the decay of 103mRh. The rhodium samples were activated in the ISIS experimental nuclear reactor at CEA Saclay. The procedure includes an absolute activity measurement by liquid scintillation counting using the Triple-to-Double Coincidence Ratio method, followed by X-ray spectrometry using a high-purity germanium detector to determine the photon emission intensities. The new result (IX = 0.0825 (17)) is derived with a significant reduction of the uncertainty.
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Affiliation(s)
- J Riffaud
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.
| | - P Cassette
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - D Lacour
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - I Tartès
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - M A Kellett
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - M Corbel
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - C Domergue
- CEA, DEN, DER, Laboratoire de Dosimétrie, Capteurs et Instrumentation (LDCI), Cadarache, 13108 Saint Paul-lez-Durance, France
| | - C Destouches
- CEA, DEN, DER, Laboratoire de Dosimétrie, Capteurs et Instrumentation (LDCI), Cadarache, 13108 Saint Paul-lez-Durance, France
| | - H Carcreff
- CEA, DEN, DRSN, Laboratoire de Support aux Programmes d'Irradiation (LSPI), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - O Vigneau
- CEA, DEN, DEC, Laboratoire d'Analyses Radiochimiques et Chimiques (LARC), Cadarache, 13108 Saint Paul-lez-Durance, 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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9
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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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10
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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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Lucas PA, Aubineau-Lanièce I, Lourenço V, Vermesse D, Cutarella D. Using LiF:Mg,Cu,P TLDs to estimate the absorbed dose to water in liquid water around an 192Ir brachytherapy source. Med Phys 2014; 41:011711. [PMID: 24387503 DOI: 10.1118/1.4851636] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
PURPOSE The absorbed dose to water is the fundamental reference quantity for brachytherapy treatment planning systems and thermoluminescence dosimeters (TLDs) have been recognized as the most validated detectors for measurement of such a dosimetric descriptor. The detector response in a wide energy spectrum as that of an (192)Ir brachytherapy source as well as the specific measurement medium which surrounds the TLD need to be accounted for when estimating the absorbed dose. This paper develops a methodology based on highly sensitive LiF:Mg,Cu,P TLDs to directly estimate the absorbed dose to water in liquid water around a high dose rate (192)Ir brachytherapy source. METHODS Different experimental designs in liquid water and air were constructed to study the response of LiF:Mg,Cu,P TLDs when irradiated in several standard photon beams of the LNE-LNHB (French national metrology laboratory for ionizing radiation). Measurement strategies and Monte Carlo techniques were developed to calibrate the LiF:Mg,Cu,P detectors in the energy interval characteristic of that found when TLDs are immersed in water around an (192)Ir source. Finally, an experimental system was designed to irradiate TLDs at different angles between 1 and 11 cm away from an (192)Ir source in liquid water. Monte Carlo simulations were performed to correct measured results to provide estimates of the absorbed dose to water in water around the (192)Ir source. RESULTS The dose response dependence of LiF:Mg,Cu,P TLDs with the linear energy transfer of secondary electrons followed the same variations as those of published results. The calibration strategy which used TLDs in air exposed to a standard N-250 ISO x-ray beam and TLDs in water irradiated with a standard (137)Cs beam provided an estimated mean uncertainty of 2.8% (k = 1) in the TLD calibration coefficient for irradiations by the (192)Ir source in water. The 3D TLD measurements performed in liquid water were obtained with a maximum uncertainty of 11% (k = 1) found at 1 cm from the source. Radial dose values in water were compared against published results of the American Association of Physicists in Medicine and the European Society for Radiotherapy and Oncology and no significant differences (maximum value of 3.1%) were found within uncertainties except for one position at 9 cm (5.8%). At this location the background contribution relative to the TLD signal is relatively small and an unexpected experimental fluctuation in the background estimate may have caused such a large discrepancy. CONCLUSIONS This paper shows that reliable measurements with TLDs in complex energy spectra require a study of the detector dose response with the radiation quality and specific calibration methodologies which model accurately the experimental conditions where the detectors will be used. The authors have developed and studied a method with highly sensitive TLDs and contributed to its validation by comparison with results from the literature. This methodology can be used to provide direct estimates of the absorbed dose rate in water for irradiations with HDR (192)Ir brachytherapy sources.
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Affiliation(s)
- P Avilés Lucas
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette, France
| | - I Aubineau-Lanièce
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette, France
| | - D Vermesse
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette, France
| | - D Cutarella
- CEA, LIST, Laboratoire National Henri Becquerel, 91191 Gif-sur-Yvette, France
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12
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Ferreux L, Lépy MC, Bé MM, Isnard H, Lourenço V. Photon emission intensities in the decay of 108mAg and 110mAg. Appl Radiat Isot 2014; 87:101-6. [PMID: 24369893 DOI: 10.1016/j.apradiso.2013.11.101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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: 04/24/2013] [Accepted: 11/20/2013] [Indexed: 11/18/2022]
Abstract
This study focuses on two radioisotopes of silver, (108m)Ag and (110m)Ag, characterized by a complex decay scheme. Each isotope has two disintegration modes, the isomeric transition leading to the daughter isotope ((108)Ag and (110)Ag, respectively) with a short half-life. The radioactive solution was obtained by neutron activation on silver powder enriched in (109)Ag. Gamma-spectrometry was carried out using a calibrated high purity germanium detector. The main relative photon emission intensities for both radionuclides were obtained and compared with previously published values.
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Affiliation(s)
- L Ferreux
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France.
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
| | - M-M Bé
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
| | - H Isnard
- CEA, DEN/DANS/DPC/SEARS, Laboratoire de Développement Analytique Nucléaire Isotopique et Elémentaire, PC 33, Gif-sur-Yvette F-91191, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
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13
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Lourenço V, Ferreux L, Lacour D, Le Garrérès I, Morelli S. Preparation of spiked grass for use as an environmental radioactivity reference material. Appl Radiat Isot 2013; 87:456-60. [PMID: 24331857 DOI: 10.1016/j.apradiso.2013.11.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 04/25/2013] [Accepted: 11/17/2013] [Indexed: 11/20/2022]
Abstract
Measurement of radionuclides from environmental samples includes a wide variety of matrix compositions and densities. To improve the traceability of environmental monitoring, LNE-LNHB intends to produce mixed γ-ray reference materials with a known mass activity and a composition as representative as possible of real environmental samples. This paper describes the preparation and characterization of a low density treated grass matrix spiked with mixed γ-emitters. This material was used in a proficiency test exercise whose results are presented.
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Affiliation(s)
- V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France.
| | - L Ferreux
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - D Lacour
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - I Le Garrérès
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
| | - S Morelli
- CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), 91191 Gif-sur-Yvette Cedex, France
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Le Roy M, Daures J, de Carlan L, Delaunay F, Garcia T, Gouriou J, Lourenço V, Ostrowsky A, Sommier L, Sorel S, Vermesse D, Bordy JM, Hachem S. Establishment of references in terms of absorbed dose to water in MV X-ray beams for small radiation fields. Phys Med 2011. [DOI: 10.1016/j.ejmp.2011.06.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lin M, Garcia T, Lourenço V, Cui Y, Chen Y, Wang F. Bilateral comparison of an alanine/ESR dosimetry system at radiotherapy dose levels. RADIAT MEAS 2010. [DOI: 10.1016/j.radmeas.2010.03.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lourenço V. Inhaled aerosols. Arch Intern Med 1973; 131:21-2. [PMID: 4682060 DOI: 10.1001/archinte.1973.00320070023002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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