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PEOPLE@HES-SO – Annuaire et Répertoire des compétences
PEOPLE@HES-SO – Annuaire et Répertoire des compétences

PEOPLE@HES-SO
Annuaire et Répertoire des compétences

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Triscone Gilles

Triscone Gilles

Professeur HES ordinaire

Compétences principales

Metrology

Protection again radiation

Radon

Nuclear physics

Radiation simulation

Material sciences

Superconductivity

  • Contact

  • Enseignement

  • Publications

  • Conférences

Contrat principal

Professeur HES ordinaire

Bureau: DI

Haute école du paysage, d'ingénierie et d'architecture de Genève
Rue de la Prairie 4, 1202 Genève, CH
hepia
Domaine
Technique et IT
Filière principale
Microtechniques
BSc HES-SO en Microtechniques - Haute école du paysage, d'ingénierie et d'architecture de Genève
  • Radioprotection opérationnelle
  • Nucléaire appliqué
BA HES-SO en Architecture - Haute école du paysage, d'ingénierie et d'architecture de Genève
  • Le radon dans les habitations

2024

Strontium-90 pollution can be bioremediated with the green microalga Tetraselmis chui
Article scientifique ArODES

Inés Segovia-Campos, Anastasios Kanellakopoulos, Ivan John Barrozo, Edouard Fock-Chin-Ming, Montserrat Filella, Axel Baxarias Fontaine, Stavroula Pallada, Gilles Triscone, Karl Perron, Daniel Ariztegui

Environmental Science: Processes & Impacts,  2024, 26, 3, 622-631

Lien vers la publication

Résumé:

Strontium-90 (90Sr) is an artificial radioisotope produced by nuclear fission, with a relatively long half-life of 29 years. This radionuclide is released into the environment in the event of a nuclear incident, posing a serious risk to human and ecosystem health. There is a need to develop new efficient methods for the remediation of 90Sr, as current techniques for its removal have significant technical limitations and involve high energy and economic costs. Recently, several species of green microalgae within the class Chlorodendrophyceae have been found to form intracellular mineral inclusions of amorphous calcium carbonate (ACC), which can be highly enriched in natural (non-radiogenic) Sr. As bioremediation techniques are an attractive option to address radioactive pollution, we investigated the capacity of the unicellular alga Tetraselmis chui (class Chlorodendrophyceae) to sequester 90Sr. The 90Sr uptake capacity of T. chui cells was assessed in laboratory cultures by monitoring the time course of radioactivity in the culture medium using liquid scintillation counting (LSC). T. chui was shown to effectively sequester 90Sr, reducing the initial radioactivity of the culture medium by up to 50%. Thus, this study demonstrates the potential of the microalga T. chui to be used as a bioremediation agent against 90Sr pollution.

Strontium-90 pollution can be bioremediated with the green microalga Tetraselmis chui
Article scientifique

Pallada Stavroula, Kanellakopoulos Anastasios, Triscone Gilles, Axel Baxarias Fontaine, Iñes Segovia-Campos, Karl Perron, Daniel Ariztegui, Montserrat Filella, Ivan Barrozo, Edouard Fock-Chin-Ming

Environ. Sci.: Processes Impacts,, 2024 , vol.  26, pp.  622-631

Lien vers la publication

Résumé:

Strontium-90 (90Sr) is an artificial radioisotope produced by nuclear fission, with a relatively long half-life of 29 years. This radionuclide is released into the environment in the event of a nuclear incident, posing a serious risk to human and ecosystem health. There is a need to develop new efficient methods for the remediation of 90Sr, as current techniques for its removal have significant technical limitations and involve high energy and economic costs. Recently, several species of green microalgae within the class Chlorodendrophyceae have been found to form intracellular mineral inclusions of amorphous calcium carbonate (ACC), which can be highly enriched in natural (non-radiogenic) Sr. As bioremediation techniques are an attractive option to address radioactive pollution, we investigated the capacity of the unicellular alga Tetraselmis chui (class Chlorodendrophyceae) to sequester 90Sr. The 90Sr uptake capacity of T. chui cells was assessed in laboratory cultures by monitoring the time course of radioactivity in the culture medium using liquid scintillation counting (LSC). T. chui was shown to effectively sequester 90Sr, reducing the initial radioactivity of the culture medium by up to 50%. Thus, this study demonstrates the potential of the microalga T. chui to be used as a bioremediation agent against 90Sr pollution.

2016

Computational fluid dynamics as a tool to predict the air pollution dispersion in a neighborhood :
Article scientifique ArODES
a research project to improve the quality of life in cities

Gilles Triscone, Nabil Abdennadher, Christophe Balistreri, Olivier Donzé, D. Greco, Patrick Haas, H. Haas-Pekoz, T. Mohamed-Nour, Pierre Munier, Piero Pontelandolfo, Roberto Putzu, Jacques Richard, H. Sthioul, Nicolas Delley, D. Choffat, Elena-Lavinia Niederhäuser, Roger Schaer, Henning Müller, Jean Decaix, Sylvain Richard, Cécile Münch-Alligné, P. Kunz, F. Despot

International Journal of Sustainable Development and Planning,  2016, vol. 11, no. 4, pp. 546-557

Lien vers la publication

Résumé:

In large cities, pollution composed of many different chemical components and small particles is an important public health problem that affects especially children and people presenting breathing difficulties. One challenge for public authorities is to respect the norms given by the central state, but how? Today, concrete methods for reducing pollution are perceived by the majority of citizens as constraints. However, the authorities have the possibility of modifying the wind’s action by imposing architectural constraints, such as building emplacement and roof structure. This is the main objective of the Geneva ‘Clean City’ project financed by the University of Applied Sciences Western Switzerland. ‘Clean City’ focuses its research on one of Geneva’s polluted neighborhood called Pâquis, which is situated directly on the Geneva lake front. The project attempts to understand the dispersion of pollution from an experimental and a numerical point of view. After validation of the technique for a simple case, we compare environmental measurements on a 1/500 3D scale model of the Pâquis installed in an instrumented wind tunnel with Computational Fluid Dynamics (CFD) simulation obtained with the help of cloud computing.

2012

A new measurement of the half-life of 166mHo
Article scientifique ArODES

Youcef Nedjadi, Claude Bailat, Y. Caffari, Pascal Froidevaux, Claude Wastiel, Niko Kivel, Ines Guenther-Leopold, Gilles Triscone, Frédéric Jaquenod, François Bochud

Applied Radiation and Isotopes,  2012, vol. 70, pp. 1990-1996

Lien vers la publication

Résumé:

The work presented here is a new and precise measurement of the half-life of 166mHo by determining the activity concentration, using an ionisation chamber calibrated for this nuclide, and measuring the number of 166mHo atoms using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Since the isotope 166Er interferes with the mass spectrometric measurement, Er has to be eliminated from the 166mHo radioactive solution. The elimination was achieved using ion-exchange chromatography with the cation exchange resin Dowex AG 50W-X8 and 2-Hydroxybutanoic acid as the mobile phase. After a first transit through the chromatographic column, the purified 166mHo eluate was spiked with natural Er to get a resulting Er isotopic composition close to that of natural Er at better than 99.5%, and then it underwent two further separations to eliminate the Er. The activity concentration of this Er-free radioactive 166mHo solution was measured in our reference ionisation chamber calibrated for this nuclide by means of the 4πβ(PC)-γ and 4πβ(PS)-4πγ coincidence techniques and integral counting with a well-type NaI(Tl) detector and Monte Carlo efficiencies. An aliquot of this standardized solution was sent to the Paul Scherrer Institute (PSI) for mass concentration determination using an isotope dilution MC-ICP-MS approach. The mass concentration of 166mHo in this solution was determined with 0.25% relative standard uncertainty. This value was corroborated by two other independent measurements. The new half-life of 166mHo, 1132.6(39) years (k=1), is compatible with the value determined in 1965, but is 5.6% shorter and about 43 times more precise.

2007

Strain relaxation and critical temperature in epitaxial ferroelectric Pb(Zr0.20Ti0.80)O3 thin films
Article scientifique ArODES

Stefano Gariglio, N. Stucki, Jean-Marc Triscone, Gilles Triscone

Applied Physics Letters,  2007, vol. 90, article no. 202905

Lien vers la publication

Résumé:

Strain relaxation and the ferroelectric critical temperature were investigated in a series of epitaxial Pb(Zr0.20Ti0.80)O-3 thin films of different thicknesses grown on metallic 0.5% Nb-doped SrTiO3 substrates. Detailed x-ray diffraction studies reveal that strain relaxation progressively occurs via misfit dislocations as the film thickness is increased from fully coherent films (for films below 150 A) to essentially relaxed films (for thicknesses above typically 800 A). It is found that this change in the strain state does not modify the ferroelectric critical temperature which is found for all the samples to be around 680 degrees C, a value much higher than the bulk.

Primary activity measurements with 4p? NaI(Tl) counting and Monte Carlo calculated efficiencies
Article scientifique ArODES

Youcef Nedjadi, Philippe Spring, Claude Bailat, Marc Decombaz, Gilles Triscone, Jean-Jacques Gostely, Jean-Pascal Laedermann, François O. Bochud

Applied Radiation and Isotopes,  2007, vol. 65, no. 5, pp. 534-538

Lien vers la publication

Résumé:

The radioactive concentrations of 18F, 88Y and 152Eu solutions and the activity of 222Rn gas ampoules are measured using a primary method involving 4πγ NaI(Tl) integral counting with a well-type NaI(Tl) detector and efficiencies computed by Monte Carlo simulations. The simulations use the GEANT code coupled with a routine (sch2for), which generates randomly the decay paths and emissions depending on the decay scheme parameters. The resulting radioactive concentrations of 88Y, 152Eu and 18F are found to agree with those measured with other primary measurement methods, such as 4π (β, e, X)-γ coincidence counting or liquid scintillation counting. Results of the determination of the activity of 222Rn gas ampoules by this method also match the results of an absolute standardisation technique in which radon is condensed onto a cold surface and its α-emissions are detected through an accurately specified solid angle.

2014

Computational fluid dynamics as a tool to predict the air pollution dispersio in a neighborhood :
Conférence ArODES
a research project to improve the quality of life in cities

Gilles Triscone, Nabil Abdennadher, Christophe Balistreri, Olivier Donzé, Davide Greco, Patrick Haas, Hasret Haas-Peköz, Tamer Mohamed-Nour, Pierre Munier, Piero Pontelandolfo, Roberto Putzu, Hervé Sthioul, Nicolas Delley, David Choffat, Elena-Lavinia Niederhäuser, Roger Schaer, Henning Müller, Jean Decaix, Sylvain Richard, Cécile Münch-Alligné, Pierre Kunz, Fabienne Despot

Proceedings of Smart city expo world congress 2014

Lien vers la conférence

Résumé:

In large cities, pollution composed of many different chemical components and small particles is an important public health problem that affects especially children and people presenting breathing difficulties. One challenge for public authorities is to respect the norms given by the central state, but how? Today, concrete methods for reducing pollution are perceived by the majority of citizens as constraints. However, the authorities have the possibility of modifying the wind's action by imposing architectural constraints, such as building emplacement and roof structure. This is the main objective of the Geneva "Clean City" project financed by the University of Applied Sciences Western Switzerland. "Clean City" focuses its research on one of Geneva’s polluted neighborhoods called Pâquis which is situated directly on the Geneva lake front. The project attempts to understand the dispersion of pollution from an experimental and a numerical point of view. After validation of the technique for a simple case, we compare environmental measurements on a 1/500 3D scale model of the Pâquis installed in an instrumented wind tunnel with Computational Fluid Dynamics (CFD) simulation obtained with the help of cloud computing. In Barcelona, we will show the first experimental measurements and simulated “Clean City” results.

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