Résumé du preprint DAPNIA-06-110

DAPNIA-06-110
Detection of Nuclear Material by Photon Activation Inside Cargo Containers
M.Gmar, S.Boyer, E.Berthoumieux, F.Carrel, D.Doré, M-L.Giacri, F.Lainé,B.Poumarède, D.Ridikas, A.Van Lauwe
Photons with energies above 6 MeV can be used to detect small amounts of nuclear material 
inside large cargo containers. The method consists in using an intense beam of high-energy 
photons (bremsstrahlung radiation) in order to induce reactions of photofission on actinides. 
The measurement of delayed neutrons and delayed gammas emitted by fission products brings 
specific information on localization and quantification of the nuclear material. A simultaneous 
measurement of both of these delayed signals can overcome some important limitations due 
to matrix effects like heavy shielding and/or the presence of light elements as hydrogen. We 
have a long experience in the field of nuclear waste package characterization by photon 
interrogation and we have demonstrated that presently the detection limit can be less than 
one gram of actinide per ton of package. Recently we tried to extend our knowledge to assess 
the performance of this method for the detection of special nuclear materials in sea and air 
freights. This paper presents our first results based on experimental measurements carried 
out in the SAPHIR facility, which houses a linear electron accelerator with the energy range 
from 15 MeV to 30 MeV. Our experiments were also modeled using the full scale Monte Carlo 
techniques. In addition, and in a more general frame, due to the lack of consistent data on 
photonuclear reactions, we have been working on the development of a new photonuclear 
activation file (PAF), which includes cross sections for more than 600 isotopes including 
photofission fragment distributions and delayed neutron tables for actinides. Therefore, 
this work includes also some experimental results obtained at the ELSA electron accelerator, 
which is more adopted for precise basic nuclear data measurements.

 

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