Bulk Shielding Estimation on 1GeV Electron Synchrotron Radiation Facility.
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Accession number;99A1045412
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| Title;Bulk Shielding Estimation on 1GeV Electron Synchrotron Radiation Facility. |
| Author;
IIMOTO T
(Univ. Tokyo, Tokyo, Jpn)
KOSAKO T
(Univ. Tokyo, Tokyo, Jpn)
SUGIURA N
(Univ. Tokyo, Tokyo, Jpn)
KAWANISHI T
(Univ. Tokyo, Tokyo, Jpn)
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Journal Title;Proc Symp Accel Sci Technol
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Journal Code:F0512B
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ISSN:0914-2789
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VOL.12th;NO.;PAGE.135-137(1999)
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| Figure&Table&Reference;FIG.1, TBL.7, REF.6 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Concept on the bulk shielding design for high-energy accelerator was discussed through estimates of dose rates on the VSX(VUV and soft X ray) project of the University of Tokyo. Main facilities are (1) 1GeV Linear Accelerator(LINAC) and (2) 1GeV Light Source Ring(LSR). Dose limits to be achieved around the facility for the project were determined with a large margin for safety allowance as follows; controlled area; 17.MU.Sv/h(1mSv/w*2/3) and boundary of a controlled area; 1.7.MU.Sv/h(1.3mSv/3M*2/3). Beam parameters used in bulk shielding calculations were also determined with large margins. Dose rates from photon, neutron and .MU. particle around the facility were calculated by "Swanson-Braeuer formula" and "Jenkins formula". High-dose areas were located around an electron/positron conversion target(E/P target) of LINAC and around a beam incident point of LSR. Thickness of bulk shield for LINAC was 250cm of ordinary concrete(OC) and 20cm of supplemental ions(Fe) blocks for E/P target. Thickness of that for LSR is 65cm-OC plus 15-40cm supplemental Fe for forward direction and 60cm-OC for side direction. The maximum dose rates of these high-dose areas were estimated around/over 17.MU.Sv/h. Therefore some regions would be controlled areas with working-hours limit. Dose rates at the other regions in controlled area were estimated between 0.2-2.6.MU.Sv/h during the maximum beam operation mode. Therefore the bulk shielding design of the VSX project was estimated to be successful. (author abst.) |
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