FAIR Newsletter No. 12 - GSI Webserver WWW-WIN
FAIR Newsletter No. 12 - GSI Webserver WWW-WIN
FAIR Newsletter No. 12 - GSI Webserver WWW-WIN
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Status of <strong>FAIR</strong> Radiation Safety<br />
Georg Fehrenbacher (<strong>GSI</strong>)<br />
<strong>FAIR</strong> <strong>Newsletter</strong> <strong>No</strong>. <strong>12</strong> April 2009<br />
Radioactive Activation of Components at <strong>FAIR</strong><br />
The operation of the <strong>FAIR</strong> heavy ion accelerators will be associated with the<br />
production of short-lived radioactivity. Two main paths dominate this: The<br />
fragmentation of projectile and target nuclei and the causation of spallation reactions<br />
by high energy neutrons, being released in heavy ion nuclear reactions.<br />
Fig. 1: Shielding design and dose distribution in the target area of the Super-FRS and in the<br />
maintenance channel.<br />
In the framework of two research projects, SAFERIB (EURONS contract 506065)<br />
and <strong>GSI</strong>-INTAS (EU-contract 03-54-3588), the production of radioisotopes was<br />
measured and calculated. Measurements for uranium beams were performed at <strong>GSI</strong><br />
at energies of 500 and 950 MeV/u, Copper and stainless steel were chosen as targets.<br />
The experiment was modeled using the FLUKA 1 Monte Carlo (MC) code. The key<br />
results of the measurements can be summarized as follows: The overall production of<br />
radioactivity can be estimated with FLUKA within a factor of two, and the magnitude<br />
of the activity of the produced radioisotopes is dominated by target fragmentation 2 .<br />
The building up of radioactivity and the exposure of personnel to potential radiation in<br />
specific experiment and accelerator structures can be estimated on the basis of MC<br />
computations and on assumptions for operation modes and beam parameters.<br />
Refining of layouts of such areas improve the radiological circumstances.<br />
The target area of the Super Fragment Separator (Super-FRS) is an example for<br />
the development of a shielding layout for an area with radioactivity production.<br />
1 FLUKA: a multi-particle transport code" G. Battistoni, S. Muraro, P.R. Sala, F. Cerutti, A. Ferrari, S. Roesler, A.<br />
Fasso`, J. Ranft, Proceedings of the Hadronic Shower Simulation Workshop 2006, Fermilab 6--8 September 2006, M.<br />
Albrow, R. Raja eds., AIP Conference Proceeding 896, 31-49, (2007) "The FLUKA code: Description and<br />
benchmarking" A. Fasso`, A. Ferrari, J. Ranft, and P.R. Sala, CERN-2005-10 (2005), INFN/TC_05/11, SLAC-R-773<br />
2 E. Kozlova et al. Validation of the FLUKA MC code for residual production with 500 MeV/u and 950 MeV/u<br />
Uranium Beam on Copper and Stainless Steel Target, ICRS11, Georgia, USA (2008) accepted for publication in<br />
Nuclear technology (2009)<br />
<strong>12</strong> / 18