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THETA: A three-dimensional particle transport code based on the random ray method for radiation shielding calculation
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DOI：10.1016/j.anucene.2025.112023.png)
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Abstract
En 中文
Accurate radiation shielding simulation is hindered by a dilemma between conventional deterministic methods, which suffer from non-physical ray effects, and stochastic methods, which are plagued by excessive variance in deep-penetration scenarios. The Random Ray Method (TRRM), which combines the Method of Characteristics with Monte Carlo integration, offers a potential solution by fundamentally eliminating ray effects while ensuring statistical sampling. In this work, we introduce THETA, a three-dimensional particle transport code developed to unlock the practical potential of TRRM for large-scale, practical shielding analysis. THETA's capabilities were validated against transport benchmarks and, for the first time, the VENUS-3 benchmark based on a practical experimental facility. The results demonstrate good agreement with experimental data; in the VENUS-3 benchmark, 95 % of the calculated detector responses fall within a 10 % discrepancy of the measured values. This numerical test establishes THETA as a viable tool and proves TRRM is a viable approach for shielding simulations.
Keywords:
Radiation shielding
Particle transport
The random ray method
VENUS-3