A. Belafrites

Publications (4)2 Total impact

• Article: A joint UAB-IReS-IPNO neutron comparison exercise with nuclear track detectors

  F. Fernández, K. Amgarou, C. Domingo, M.J. García, A. Nourreddine, D. Mouhssine, A. Belafrites, I. Ribaud
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  ABSTRACT: The response of PN3 and CR-39 personal dosemeters with different configurations, developed by the IReS (Strasbourg), the IPNO (Orsay) and the UAB (Barcelona) groups, is investigated in this study. Both dosemeters were mounted on a water-filled phantom and were simultaneously exposed under different incidence angles (0∘, 30∘ and 60∘) to the following: (i) three ISO neutron sources (241Am-Be, bare 252Cf and moderated 252Cf with Cd shielding), and (ii) two realistic neutron sources (SIGMA and moderated 252Cf) at the IRSN (Cadarache) facilities. After irradiation, the plastic detectors were etched and evaluated according to local routine procedures and corrections for the effect of source-to-detector distance were taken into account. A comparison of the average background, the minimum detectable dose equivalent and the field calibration factor is performed as well.
  Radiation Measurements 12/2004; 40(2-6):601-606. · 1.18 Impact Factor
• Article: Comparison of imaging plates with track detectors for fast-neutron dosimetry.

  A Belafrites, A Nourreddine, D Mouhssine, A Nachab, A Pape, A Boucenna, F Fernández
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  ABSTRACT: Imaging plate (IP) radiation detectors are widely used in industrial radiography, medical imagery and autoradiography. When an IP is exposed to ionising radiation, some of the energy is absorbed to form a latent image. The energy stored, which is proportional to the dose received, can be liberated by a selective optical stimulation and collected to reconstitute the distribution of the ionising radiation on the IP. In this work, IPs for use in fast-neutron measurements are characterised. The response of our IP dosemeters in conjunction with their reading system was found to be linear in dose between 75 microSv and 10 mSv. This performance is compared with those of dosemeters based on the plastic track detectors PN3 and CR-39.
  Radiation Protection Dosimetry 02/2004; 110(1-4):333-6. · 0.82 Impact Factor
• Source

  Available from: arxiv.org

  Article: Vies Moyennes Des Etats Excites Du 19F

  A. Belafrites, A. Boucenna, C. Benazzouz, M. A. Benammar
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  ABSTRACT: The determination of the mean lifetime of excited states has been undertaken by coulomb excitation that is a process of inelastic scattering in which the incident particle is charged and provokes an excitation of the target nucleus by mean of the electromagnetic fields during the passage of the projectile. The cross section of this inelastic scattering is proportional to the width of the isomeric state. The mean lifetime of excited states of the 19F are determined by comparing the experimental results of reactions 19F(alpha,alpha' gamma)19F and 19F(p, p' gamma)19F with the theoretical calculations achieved with the help of the multiple coulomb excitation program Coulex. These mean lifetimes are compared to those restraints by Ajzenberg - Selove [1] and Alder and al. [2].
  05/2003;
• Article: Response of PN3 dosimeters to 239Pu–Be neutrons

  A. Belafrites, A. Nourreddine, D. Mouhssine, A. Nachab, A. Boucenna
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  ABSTRACT: CR-39 type PN3 plastic detectors associated with a polyethylene or PN3 radiator or without radiator were exposed to Pu–Be neutrons to evaluate their effectiveness as fast neutron dosimeters. The detectors were chemically etched and track counting was performed using an automated system. It was found that the dosimeter responses were linear up to a neutron dose equivalent of 200 mSv and that the simple PN3 detector without radiator has the same response as the two-element dosimeters and thus appears as a promising fast neutron dosimeter.
  Radiation Measurements. 39(2):241-244.