Jean-Luc Ma's research while affiliated with Cea Leti and other places
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Publications (9)
Gamma logging for uranium exploration is currently based on total counting with the Geiger-Müller gas detectors or NaI(Tl) scintillators. However, the total count rate interpretation in terms of uranium concentration may be impaired in case of roll fronts when the radioactive equilibrium of the natural
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Since the last past years, the Nuclear Measurement Laboratory of CEA Cadarache, France, together with Partners from European and National projects, has been studying the application of fast neutron interrogation with the Associated Particle Technique for material identification in different areas of homeland and maritime security, and for the chara...
The yields of fission products are one of the main characteristics of the fission process. In the field of nuclear waste package characterization, using Photon Activation Analysis (PAA), these yields are needed in order to optimize a technique enabling the identification of actinides (<sup>235</sup>U, <sup>238</sup>U, <sup>239</sup>Pu), based on th...
Abstract-The Alpha-activity resulting from the presence of actinides inside nuclear waste packages must be characterized, in order to select the most appropriate means of storage. Non-destructive active methods, based on the fission process, allow the global mass of actinides to be quantified. However, in most cases, these measurements provide no i...
The associated particle technique (APT) is a “neutron in - gamma out” non destructive characterization method recently brought out of the laboratory thanks to the development of transportable associated particle neutron generators. The possibility to determine a 3D map of the elements present in an inspected volume makes this technique very attract...
The detection of special elements that can be used by terrorists in improvised chemical weapons can be performed by the spectroscopic analysis of neutron-induced gamma rays. Numerical simulations and experiments have been performed with the aim of designing a portable inspection system. Both thermal neutron analysis (TNA) and the associated particl...
A characterization of the alpha-activity due to the presence of actinides inside nuclear waste packages is necessary to select the best mode of storage. Non-destructive active methods, based on fission process, allow to quantify the global mass of actinides. However, these measurements give no information on the nature of isotopes in most cases. We...
The EURopean Illicit TRAfficing Countermeasures Kit project is part of the 6th European Union Framework Program, and aims at developing a neutron inspection system for detecting threat materials (explosives, drugs, etc.) in cargo containers. Neutron interaction in the container produces specific gamma-rays used to determine the chemical composition...
The EURopean Illicit TRAfficing Countermeasures Kit project is part of the 6th European Union Framework Program, and aims at developing a neutron inspection system for detecting threat materials (explosives, drugs, etc.) in cargo containers. Neutron interaction in the container produces specific gamma-rays used to determine the chemical composition...
Citations
... Determining the concentration of uranium ore samples by high-resolution gamma spectrometry with a high-31 purity germanium (HPGe) detector [1] allows avoiding the well-known disequilibrium issues encountered in 32 total gamma counting [2]. Indeed, as shown in Figure 1, most gamma radiation is emitted by the 226 Ra 33 descendants 214 Bi and 214 Pb. ...
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... Detection of characteristic γ quanta produced in de-excitation of the nuclei then allows one to identify the elemental composition of the substance [7,8]. The NAA is widely used in explosives detection systems operating on the ground, such as EURITRACK or SWAN [9][10][11], but in the aquatic environment one needs to overcome many difficulties related to technical aspects and strong background radiation from oxygen and hydrogen. There is only one solution built and tested in the framework of the show the official and unofficial transport routes, respectively. ...
... Furthermore, for C-BORD, it also planned to detect chemical warfare agents by recognizing their characteristic gamma rays. LaBr3 detectors will be used to identify specific low-energy (<1 MeV) gamma rays, which are sign the presence of elements such as arsenic or bromine [3]. ...
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... The reliable information about their isotopic composition is required to successfully solve this problem. One of the widely used non-destructive methods for the detection and isotopic identification of unshielded and shielded nuclear materials is based on the use of delayed gamma-rays from their fission products [1][2][3][4][5][6][7][8][9][10]. ...
... The large numbers of pure elements were measured with the LaBr 3 : Ce and BGO gamma-ray detectors and used in fitting procedures, but their gammaray spectra were not very well presented ( Fig. 5 in [9]). Another example is described in [10] where the capacity of thermal neutron analysis (TNA) and the associated alpha particle method (AAP) to detect fluorine, sodium, phosphorus, sulphur, chlorine, arsenic, bromine, iodine and mercury have been studied. Tagged neutron-based sensor suitable for luggage control was also presented in [11] where an 76 mm ×76 mm LYSO gamma-ray detector was used. ...
... The existing experimental data on product yields at energies close to the second chance threshold of photofission of 238 U [3,9,14] describe only the shape of the mass distribution and do not allow us to draw an unambiguous conclusion about its structure due to the lack of a sufficient number of experimental points (at fixed fragment masses). ...
... The reliable information about their isotopic composition is required to successfully solve this problem. One of the widely used non-destructive methods for the detection and isotopic identification of unshielded and shielded nuclear materials is based on the use of delayed gamma-rays from their fission products [1][2][3][4][5][6][7][8][9][10]. ...
