Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Centre National De La Recherche Scientifique

Sorbonne Université

Pellenc

Elicit Plant

Matthieu Hamel

Stephane Normand

Stéphane Darbon

Guillaume Bertrand

Tony Caillaud

Adrien Rousseau

Vladimir Kondrasovs

Stéphane Normand

Karim Boudergui

Fabien Sguerra

Emmanuel Scorsone

Romain Coulon

Aymeric Molin

Vesna Simic

Camille Frangville

Jonathan Dumazert

Charlène Boussiron

Fabrice Mathevet

David Kreher

Mathieu Trocme

Licinio Rocha

Chrystele Pittance

Chrystele Dehe-Pittance

Pauline Blanc

Gregory Turk

Frédérick Carrel

Alexandre Rogier

Eva Montbarbon

Haixia Li

Grégory Turk

Chrystèle Pittance

A radiation detector may include an active structure having an input face and an output face for incident ionizing radiation. The active structure may include: a first organic scintillator including at least one neutron-absorbing material and enabling discrimination between fast neutrons, thermal neutrons, and photons; at least one second scintillator arranged in front of the first scintillator and capable of preferentially detecting the alpha and/or beta radiation, the two scintillators having, due to the choice of their constituents, different mean pulse decay constants, and the second scintillator having a thickness smaller than the first.

Ionizing radiation detector

Polymerization composition for manufacturing a hybrid material for plastic scintillation detection comprising: a) monomers, oligomers or their mixtures intended to form at least one constituent polymer of a polymeric matrix and b) a liquid fluorescent mixture comprising i) 95.6 molar % to 99.1 molar % of a main primary fluorophore consisting of naphthalene and ii) 0.9 molar % to 4.4 molar % of an additional primary fluorophore; wherein the centroid of the light absorption spectrum and of the fluorescence emission spectrum, the fluorescence decay constant and the fluorescence quantum yield of which are judiciously chosen. The decay constant of the fluorescence of the hybrid material manufactured with the polymerization composition is intermediate between that of a fast plastic scintillator material and of a slow plastic scintillator. Further, it can be chosen over a wide range. The invention also relates to ready-for-use kits for manufacturing a polymerization composition.

Polymerization composition for producing a scintillating hybrid material and associated kits

Hybrid material for plastic scintillation measurement comprising: The decay constant of the fluorescence of the hybrid material is intermediate between that of a fast plastic scintillator material and of a slow plastic scintillator material. Further, they can be chosen over a wide range. The invention also relates to an associated part, device and item of equipment, to their processes of manufacture or their methods of measurement.

Scintillating hybrid material, associated part, associated device and associated apparatus, methods for producing or measuring same

A scintillator for imaging using X-rays or gamma rays or charged particles, includes a network of glass capillaries with an inner diameter no greater than 500 micrometers. The capillaries are filled with a polymer material made up of at least: (i) a monomer selected from the group including vinyltoluene, styrene and vinylxylene and the isomers thereof, (ii) a cross-linking agent made up of a dimethacrylate having a central chain which includes 1 to 12 carbon atoms, and (iii) lead dimethacrylate. The cross-linking agent is provided to make up 17 wt % to 60 wt % of the mixture thereof with the monomer, and the lead dimethacrylate makes up at least 5 wt %. The cross-linking agent is provided in a ratio of 1.75 to 2.25 times the weight content of the lead dimethacrylate.

Lead-loaded structured solid organic scintillator

A scintillator for imaging using X-rays or gamma rays or charged particles, includes a network of glass capillaries with an inner diameter no greater than 500 micrometers. The capillaries are filled with a polymer material made up of at least (i) a monomer selected from the group comprising vinyltoluene, styrene and vinylxylene and the isomers thereof, (ii) a cross-linking agent made up of a divinylbenzene or a dimethacrylate having a central chain which includes 1 to 12 carbon atoms, and (iii) triphenylbismuth. The cross-linking agent is provided to make up 10 wt % to 60% wt of the mixture thereof with the monomer, and the triphenylbismuth makes up at least 5 wt %. The cross-linking agent is provided in a ratio of 0.75 to 2.25 times the weight content of the triphenylbismuth.

Bismuth-charged structured solid organic scintillator

The invention relates to a solid organic scintillator comprising a polymeric matrix in which there are dispersed one or more fluorophore compounds and one or more chemical elements having an atomic number ranging from 40 to 83, characterized in that said scintillator has a weight content of said chemical elements of at least 5% by weight relative to the total weight of the scintillator, and in that the scintillator emits an emission spectrum comprising an emission peak at a wavelength of at least 550 nm.

Solid organic scintillator doped by one or more chemical elements

A plastic scintillator material, a plastic scintillator prepared by shaping the material, a detection portal, and a method for discrimination a signal due to fast neutrons. The plastic scintillator material including a polymeric matrix into which is incorporated at least one fluorescent compound at a mass concentration greater than or equal to 10% by mass of the total mass of the material. The polymeric matrix comprises a crosslinked polymer obtainable by polymerization of a mixture comprising at least one aromatic monomer and at least one monomer which is a crosslinking agent selected from the group consisting of an alkyl diacrylate, an alkyl dimethacrylate, and a mixture thereof, and molar proportions of the crosslinking monomer and of the aromatic monomer in the mixture are from 10% to 50% and from 90% to 50%, respectively.

Plastic scintillator materials, plastic scintillators comprising such materials and method for distinguishing neutrons from gamma rays using said scintillators

A method for processing electrical signals from a phoswich scintillator including an upstream scintillator and a downstream scintillator, the method including, for each electrical signal: digitization of the electrical signal; determination of an amplitude and an integral surface area of the digitized electrical signal; and representation of an event associated with an electrical signal by a pair of data items.

Method for processing a signal from a phoswich scintillator, and associated scintillation detector

The invention relates to the use of 1,8-naphthalimide derivatives and of their salts as scintillation agents and more specifically as agents for discriminating between fast neutrons and gamma rays. It also relates to liquid scintillators comprising these scintillation agents in solution in a solvent and to novel 1,8-naphthalimide derivates of use as scintillation agents, in particular for discriminating between fast neutrons and gamma rays. Applications: all the fields of use of scintillators and in particular industry, geophysics, fundamental physics, in particular nuclear physics, the safety of goods and people, protection from radiation of workers in the industrial, nuclear and medical sectors, medical imaging, and the like.

1,8-naphthalimide derivatives as scintillation agents, in particular for discriminating between fast neutrons and gamma rays

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Cherbourg-Octeville, France

Matthieu Hamel