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

Roquette Freres

Veronique Rebuffel

Jean Rinkel

Guillaume Beldjoudi

Jean-Charles Baritaux

Mathias Ibert

Jean-Marc Dinten

Baptiste Boit

Guillaume Montemont

Loïck Verger

Caroline Paulus

Joachim Tabary

Patrice Ouvrier-Buffet

Andrea Brambilla

Aline Lecocq

Emmanuelle Schultz

Lucie Guerin

Georges Gonon

Andréa Brambilla

Charlotte Robert

Oumar Toure

Emil Popa

Emeric Bergmann

Artur Sossin

A method for determining the degree of polymerization of a polymer is disclosed, the polymer being contained in a sample (), the method comprising the following steps:

Method for determining a degree of polymerisation of a polymer

The invention is a method for characterizing an object (), comprising the following steps:

Method for characterizing an object using spectral imaging

The invention is an iterative method for acquiring a spectrum of a particle that is subjected to an illumination. It may in particular be a Raman spectrum. The method includes successively acquiring spectra that are what are called elementary spectra. These elementary spectra are combined to form a combined spectrum, which may be obtained by summing said elementary spectra. With each elementary spectrum is associated an acceptance criterion that is representative of a variation between said elementary spectrum and the elementary spectra acquired beforehand. Depending on this acceptance criterion, the elementary spectrum is either rejected, or accepted, in which case it is added to the combined spectrum. The invention makes it possible to guard against a degradation of the particle under the effect of an excessive exposure to said illumination.

Method for acquiring a spectrum

The invention relates to a method for linearizing attenuation measurements obtained by means of a direct conversion spectrometer. The spectrometer comprises a radiation source and a detector for detecting said radiation after it has passed through an object. An attenuation measurement is represented by a vector Mgiving the attenuation of the radiation in a plurality Nof energy channels of the detector, said spectrometer being characterized by a response matrix &#x3a8;. Said method estimates, by means of an iterative process, a vector M, called an equivalent linear attenuation vector, giving for each energy channel an attenuation linearly depending on the thickness of the material through which the radiation passes. Said method is applicable to the characterization of the material as well as to the reduction of artifacts in computed tomography.

Method for linearizing attenuation measurements taken by a spectrometry sensor

The invention relates to a method for processing energy spectra of a radiation transmitted by an object irradiated by a source of ionizing radiations, in particular an X radiation, for applications in medical imaging or non-destructive inspection. The method implements a detector comprising a plurality of pixels, each pixel being able to establish a spectrum of the radiation transmitted by the object. The method makes it possible, from a plurality of spectra detected, to establish so-called corrected spectra. Each corrected spectrum is an estimation of the spectrum of a radiation, called primary radiation, transmitted by the object. The invention makes it possible to reduce the influence of the scattering, by the object, of the spectrum emitted by the source.

Method for correcting a spectrum

A method for characterizing nature of a material, including: providing at least one sample of the material between an X-ray source and a detector; using the X-ray source to make N X-radiation spectra transmitted through the material, each for a time; calculating transmission function of the material as a function of energy or the detection channel; and in each of at least two energy zones, calculating the integral of the transmission function, thus forming at least a first transmission coefficient and a second transmission coefficient.

Method and device for recognition of a material making use of its transmission function

A method identifying a material, includes: measuring an electromagnetic radiation spectrum emitted through the material; determining at least one measurement energy band, and spectral coefficients of a comparison function in the measurement band, using the measured spectrum; estimating, using the determined spectral coefficients, a nature and/or thickness of the material based on a set of reference spectral parameters relating to reference materials and/or thicknesses and defined in reference bands. The estimating includes: prior selecting plural reference materials and/or thicknesses, as possible candidates, from comparing the spectral coefficients determined with at least one portion of the reference spectral parameters; estimating the nature and/or thickness of the material from comparing the spectral coefficients determined with the spectral parameters of at least one portion of the possible candidates, in at least one energy band common to the reference bands of the at least one portion of possible candidates and the measurement band.

Method and device for identifying a material by the spectral analysis of electromagnetic radiation passing through said material

A calibration method for a device for identifying materials using X-rays, including: a) determining at least one calibration material and, for each calibration material, at least one calibration thickness of this material, b) measuring, for each of the calibration materials and for each of the selected calibration thicknesses, attenuation or transmission coefficients for X radiation, c) calculating statistical parameters from the coefficients, d) determining or calculating, for each calibration material and for each calibration thickness, a presence probability distribution law, as a function of the statistical parameters.

Method of identifying materials from multi-energy X-rays

A photonic radiation detection device includes a collimator, a detector, means for localization in the detection plane defining on the one hand the partitioning of the detection plane in physical or virtual pixels of transversal dimensions smaller than those of the collimator channels, and associating on the other hand one of said pixels to each photon interaction. The detection device has at least in one previously selected acquisition configuration, a degree of pixelation in the detection plane greater than 1 and a collimator-detector distance (c) greater than one tenth of the septal height (h) of the collimator. A method for dimensioning such a device includes, for at least one given spatial frequency, calculating and comparing merit indicator values for different acquisition configurations of a structural model of the detection device.

Photonic radiation detection device, and methods for dimensioning and operating such device

A method for underwater packaging of radioactive materials includes creating a vacuum in a cavity of a cleaning device to automatically cause a portion of the cleaning device to move upward to actuate the cleaning device from an open position to a closed position; mounting the cleaning device inside a safe containment area of a transportation and/or storage device; placing the transportation and/or storage device in a pool after filling the safe containment area with water; loading a radioactive material into the safe containment area; closing the transportation and/or storage device using at least one cover; extracting the transportation and/or storage device from the pool; draining the water inside the safe containment area; and creating a pressure differential in the safe containment area to dry the safe containment area, wherein the pressure differential causes the cleaning device to automatically actuate from the closed position to the open position.

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Corenc, France

Veronique Rebuffel