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radioactivity

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TUPLS141 Measured Residual Radioactivity Induced by U Ions of Energy 500 MeV/u in a Cu Target target, ion, GSI, radiation 1834
 
  • E. Mustafin, H. Iwase, E. Kozlova, D. Schardt
    GSI, Darmstadt
  • A. Fertman, A. Golubev
    ITEP, Moscow
  • R. Hinca, M. Pavlovic, I. Strasik
    STU, Bratislava
  • N. Sobolevskiy
    RAS/INR, Moscow
  Several laboratories in the world have started or plan to build new powerful ion accelerators. These facilities promise to provide very valuable tools for experiments in fundamental nuclear physics, physics of high energy density in matter and for medical applications as well. One of the most important problems that have to be solved during the design stage is the radiation protection of the accelerator. Due to the complexity, it is hardly possible to obtain reliable radionuclide production data for accelerator structure materials from radiation transport codes. Thus, the experimental data which can be measured at the presently existing facilities are necessary for the evaluation of the induced levels of radioactivity around intense heavy ion accelerators. The Uranium beam losses are the most dangerous ones in the FAIR facility. Results of the measurement of activation induced by U beam with energy of E = 500 MeV/u in the copper target are presented in this paper.  
 
WEPCH190 A Ridge Filter for 36 MeV Proton Beam Applied to BT and ST proton, simulation, ion, target 2379
 
  • Y.K. Lim, K. R. Kim
    KAERI, Daejon
  We designed a ridge filter to obtain a uniform depth-dose distribution as well as to deliver high linear energy transfer along the depth of a target for 36MeV proton beam. Aluminum was chosen as the material of the filter to reduce the radioactivity induced by proton irradiation. The designed ridge filter has a continuous cross-sectional line shape of ridges so that the smoothly varying depth-dose distribution can be maintained before the distal fall-off for lower proton energy than 36MeV. The height of the ridge is 6 mm, its period is also 6 mm and the minimum thickness is 0.3 mm. A Monte Carlo simulation code, MCNPX 2.5.0., was used to calculate the dose distributions. The width of the calculated uniform dose region was 11 mm for 36MeV proton beam in a water-equivalent sample.  
 
WEPLS083 Consolidation of the 45-year-old CERN PS Main Magnet System radiation, CERN, vacuum, LHC 2571
 
  • Th. Zickler, D. Bodart, W. Kalbreier, K.H. Mess, A. Newborough
    CERN, Geneva
  After a major coil insulation breakdown on two of the 45-year-old CERN PS main magnets in 2003, an extensive magnet consolidation program has been launched. This article reviews the analysis of the magnet state before the repair and the applied major improvements. An overview is given of the production of the new components, the actual refurbishment and the commissioning of the main magnet system after 18 months shut down.