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Radiation Protection Dosimetry 2005 115(1-4):216-221; doi:10.1093/rpd/nci194
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The refined shielding design for the cyclotron room of the Buddhist Tzu Chi General Hospital

R. D. Sheu1, C. C. Chen1, R. J. Sheu2, C. H. Kao3 and S. H. Jiang1,*

1 Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan, ROC
2 National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, ROC
3 PET Center, Buddhist Tzu Chi General Hospital, Department of Radiological Science, Tzu Chi College of Technology, Hualien 970, Taiwan, ROC

* Corresponding author: shjiang{at}mx.nthu.edu.tw

Full-scale Monte Carlo simulations of the cyclotron room of the Buddhist Tzu Chi General Hospital were carried out to improve the inadequate maze design. The double differential neutron source from the 18O(p,n)18F reaction was adopted for the calculation. The weight window variance reduction technique, where the weight window was set by applying the adjoint flux, has been implemented in the MCNP run to facilitate the calculation of the dose rates outside the cyclotron room. Dose rates including neutron and gamma-ray components were calculated for some maze shielding modifications.


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