Paper |
Title |
Page |
TUOCFI01 |
Radiation Measurements vs. Predictions for SNS Linac Commissioning
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977 |
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- I.I. Popova, F. X. Gallmeier, P. L. Gonzalez, D. C. Gregory
ORNL, Oak Ridge, Tennessee
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Detailed predictions for radiation fields, induced inside and outside of the accelerator tunnel, were performed for each of the SNS accelerator commissioning stages, from the ion source through the entire LINAC. Analyses were performed for normal commissioning parameters, for worst possible beam accidents, and for beam fault studies, using the Monte Carlo code MCNPX. Proper temporary shielding was developed and installed in local areas near beam termination points (beam stops) and some critical locations, such as penetrations, in order to minimize dose rates in general occupied areas. Areas that are not full-time occupied and have dose rates above a specified limit during beam accident and fault studies were properly restricted. Radiation monitoring was performed using real time radiation measurement devices and TLDs to measure absorbed dose and dose equivalent rates. The measured radiation fields were analyzed and compared with transport simulations. TLD readings vs. calculations are in a good agreement, generally within a factor of two difference. A large inconsistency among instrument readings is observed, and an effort is underway to understand the variations.
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Transparencies
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TUPLS141 |
Measured Residual Radioactivity Induced by U Ions of Energy 500 MeV/u in a Cu Target
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1834 |
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- 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
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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.
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