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Radiation Protection Dosimetry Advance Access originally published online on January 25, 2005
Radiation Protection Dosimetry 2005 113(2):140-151; doi:10.1093/rpd/nch454
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Published by Oxford University Press 2005

Adjoint acceleration of Monte Carlo simulations using TORT/MCNP coupling approach: a case study on the shielding improvement for the cyclotron room of the Buddhist Tzu Chi general hospital

R. J. Sheu1,*, R. D. Sheu2, S. H. Jiang2 and C. H. Kao3

1 National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300, Taiwan, Republic of China
2 Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 300, Taiwan, Republic of China
3 PET Center, Buddhist Tzu Chi General Hospital/Department of Radiological Science, Tzu Chi College of Technology, Hualien 970, Taiwan, Republic of China

* Corresponding author: srj{at}nsrrc.org.tw

Received October 28, 2004, amended December 22, 2004, accepted January 2, 2005

Full-scale Monte Carlo simulations of the cyclotron room of the Buddhist Tzu Chi General Hospital were carried out to improve the original inadequate maze design. Variance reduction techniques are indispensable in this study to facilitate the simulations for testing a variety of configurations of shielding modification. The TORT/MCNP manual coupling approach based on the Consistent Adjoint Driven Importance Sampling (CADIS) methodology has been used throughout this study. The CADIS utilises the source and transport biasing in a consistent manner. With this method, the computational efficiency was increased significantly by more than two orders of magnitude and the statistical convergence was also improved compared to the unbiased Monte Carlo run. This paper describes the shielding problem encountered, the procedure for coupling the TORT and MCNP codes to accelerate the calculations and the calculation results for the original and improved shielding designs. In order to verify the calculation results and seek additional accelerations, sensitivity studies on the space-dependent and energy-dependent parameters were also conducted.


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