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Audouin J, Hofverberg P, Ngono-Ravache Y, Desorgher L, Baldacchino G. Intermediate LET-like effect in distal part of proton Bragg peak revealed by track-ends imaging during super-Fricke radiolysis. Sci Rep 2023; 13:15460. [PMID: 37726376 PMCID: PMC10509149 DOI: 10.1038/s41598-023-42639-4] [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: 03/29/2023] [Accepted: 09/13/2023] [Indexed: 09/21/2023] Open
Abstract
Upstream of the efficiency of proton or carbon ion beams in cancer therapy, and to optimize hadrontherapy results, we analysed the chemistry of Fricke solutions in track-end of 64-MeV protons and 1.14-GeV carbon ions. An original optical setup is designed to determine the primary track-segment yields along the last millimetres of the ion track with a sub-millimetre resolution. The Fe3+-yield falls in the Bragg peak to (4.9 ± 0.4) × 10-7 mol/J and 1.9 × 10-7 mol/J, under protons and carbon ions respectively. Beyond the Bragg peak, a yield recovery is observed over 1 mm for proton beams. It is attributed to the intermediate-LET of protons in this region where their energy decreases and energy distribution becomes broader, in relation with the longitudinal straggling of the beam. Consequently to this LET decrease in the distal part of the Bragg peak, Fe3+-yield increases. For the first time, this signature is highlighted at the chemical level under proton irradiation. Nevertheless, this phenomenon is not identified for carbon ion beams since their straggling is lower. It would need a greater spatial resolution to be observed.
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Affiliation(s)
- J Audouin
- Université Paris-Saclay, CEA, CNRS, LIDYL, 91191, Gif-sur-Yvette, France
| | | | - Y Ngono-Ravache
- CIMAP, CEA-CNRS-ENSICAEN-UNICAEN, Normandy University, Cedex 04, 14050, Caen, France
| | - L Desorgher
- Institute of Radiation Physics (IRA), Lausanne University Hospital and University of Lausanne, CH-1007, Lausanne, Switzerland
| | - G Baldacchino
- Université Paris-Saclay, CEA, CNRS, LIDYL, 91191, Gif-sur-Yvette, France.
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Ferry M, Dannoux-Papin A, Legand S, Exposito E, Durand D, Ngono-Ravache Y, Esnouf S. Alkaline hydrolysis of radio-oxidized aliphatic polymers. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bouhier M, Vigneron G, Ngono-Ravache Y, Shirdhonkar M, Renault JP, Le Caër S. In situ and time-resolved infrared detection of the reactivity induced by electrons in polymer films. Rev Sci Instrum 2017; 88:034102. [PMID: 28372418 DOI: 10.1063/1.4978442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The real time and in situ analysis of chemical reactions such as polymerization reactions, polymer degradation, and oxidation of polymers is of utmost importance. Surprisingly, only few experimental tools allowing this are available. To bridge this gap, we have developed a new experimental setup coupling a 60 keV electron gun with an infrared spectrometer operating in the mid-IR region (800-4000 cm-1) and associated with the rapid scan mode. The measurements are performed using the infrared reflection absorption spectroscopy approach. We worked here with 0.5-25 ms pulses for which the dose per pulse ranges from 4 to 200 kGy. Combining pulse electrons with rapid scan analysis enables performing experiments with a time resolution of 80 ms (and above). Therefore, this new platform can, for instance, give direct insights into reaction mechanisms at stake during the degradation of polymers. First results on a bisphenol A polycarbonate irradiated under vacuum enabling the validation of this new setup and also the recording of time-resolved spectra are presented. Reaction mechanisms are then proposed.
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Affiliation(s)
- M Bouhier
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - G Vigneron
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - Y Ngono-Ravache
- DRF/IRAMIS/CIMAP, UMR 6252, BP 5133, F-14070 Caen Cedex 5, France
| | - M Shirdhonkar
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - J P Renault
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
| | - S Le Caër
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris Saclay, F-91191 Gif-sur-Yvette Cedex, France
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Ventura A, Ngono-Ravache Y, Marie H, Levavasseur-Marie D, Legay R, Dauvois V, Chenal T, Visseaux M, Balanzat E. Hydrogen Emission and Macromolecular Radiation-Induced Defects in Polyethylene Irradiated under an Inert Atmosphere: The Role of Energy Transfers toward trans-Vinylene Unsaturations. J Phys Chem B 2016; 120:10367-10380. [DOI: 10.1021/acs.jpcb.6b04503] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Ventura
- Centre
de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, CEA-CNRS, Boulevard Henri Becquerel, BP 5133, 14070 Cedex 5, France
| | - Y. Ngono-Ravache
- Centre
de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, CEA-CNRS, Boulevard Henri Becquerel, BP 5133, 14070 Cedex 5, France
| | - H. Marie
- Centre
de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, CEA-CNRS, Boulevard Henri Becquerel, BP 5133, 14070 Cedex 5, France
| | - D. Levavasseur-Marie
- Centre
de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, CEA-CNRS, Boulevard Henri Becquerel, BP 5133, 14070 Cedex 5, France
| | - R. Legay
- Laboratoire
de Chimie Moléculaire et Thioorganique (LCMT), UMR 6507, 6 Boulevard
Maréchal Juin, 14000 Caen, France
| | - V. Dauvois
- Laboratoire
de Radiolyse et de la Matière Organique (LRMO), CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - T. Chenal
- Univ. Lille, CNRS, ENSCL, Centrale Lille, Univ. Artois, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS), F-59000 Lille, France
| | - M. Visseaux
- Univ. Lille, CNRS, ENSCL, Centrale Lille, Univ. Artois, UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS), F-59000 Lille, France
| | - E. Balanzat
- Centre
de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, CEA-CNRS, Boulevard Henri Becquerel, BP 5133, 14070 Cedex 5, France
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Ferry M, Pellizzi E, Boughattas I, Fromentin E, Dauvois V, de Combarieu G, Coignet P, Cochin F, Ngono-Ravache Y, Balanzat E, Esnouf S. Effect of cumulated dose on hydrogen emission from polyethylene irradiated under oxidative atmosphere using gamma rays and ion beams. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.06.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ngono-Ravache Y, Damaj Z, Dannoux-Papin A, Ferry M, Esnouf S, Cochin F, De Combarieu G, Balanzat E. Effect of swift heavy ions on an EPDM elastomer in the presence of oxygen: LET effect on the radiation-induced chemical ageing. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2014.10.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ferry M, Bessy E, Harris H, Lutz PJ, Ramillon JM, Ngono-Ravache Y, Balanzat E. Aliphatic/aromatic systems under irradiation: influence of the irradiation temperature and of the molecular organization. J Phys Chem B 2013; 117:14497-508. [PMID: 24168676 DOI: 10.1021/jp406260z] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
With the aim of understanding the electronic excitation, charge or reactive species transfers occurring during irradiation, we studied the role of the aromatic content on ethylene/styrene random copolymers (PES) and on cyclohexane/benzene glasses (amorphous organic solids). Radiation-induced modifications were monitored in situ, at the molecular level, using Fourier transform infrared spectroscopy (FTIR). Irradiations were performed under a vacuum, and thanks to in situ measurements, oxidation was avoided. We followed both the C═C bond creation in the aliphatic moiety and the destruction of the aromatic moiety. The influence of the irradiation temperature was investigated by irradiating samples at room temperature and at 11 K. At such a low temperature, long-range migration hardly occurs and its influence is considerably reduced or could even vanish. Therefore, low temperature irradiation gives insight on the relative influence of reactive species transport and electronic excitation and charge transport. We found that the effect of lowering the PES irradiation temperature from room temperature to 11 K is small, indicating a minor role for the reactive species transport. Moreover, the two chosen systems allow the examination of the relative magnitude of intra- and intermolecular transfers. We demonstrate that, under conditions where reactive species are almost frozen, intermolecular transfers are very efficient.
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Affiliation(s)
- M Ferry
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5, France
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Ferry M, Bessy E, Harris H, Lutz P, Ramillon JM, Ngono-Ravache Y, Balanzat E. Irradiation of Ethylene/Styrene Copolymers: Evidence of Sensitization of the Aromatic Moiety As Counterpart of the Radiation Protection Effect. J Phys Chem B 2012; 116:1772-6. [DOI: 10.1021/jp209535p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Ferry
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5,
France
| | - E. Bessy
- Institut Charles
Sadron, CNRS
UPR 22, Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
| | - H. Harris
- Institut Charles
Sadron, CNRS
UPR 22, Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
| | - P.J. Lutz
- Institut Charles
Sadron, CNRS
UPR 22, Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
| | - J.-M. Ramillon
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5,
France
| | - Y. Ngono-Ravache
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5,
France
| | - E. Balanzat
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5,
France
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Affiliation(s)
- M. Ferry
- CIMAP Unit e Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5, France
| | - Y. Ngono-Ravache
- CIMAP Unit e Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5, France
| | - V. Picq
- CIMAP Unit e Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5, France
| | - E. Balanzat
- CIMAP Unit e Mixte CEA-CNRS-ENSICAEN, BP 5133, 14070 Caen Cedex 5, France
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