NUCLEAR TECHNIQUES, Volume. 47, Issue 2, 020602(2024)
Application of global variance reduction methods for the calculation of γ radiation field in a large space
Figures & Tables(14)
Fig. 1. Geometric model for the computation of large-space γ radiation field (color online)
Fig. 2. Calculated γ fluence and error in the circular and rectangular grid cells with respect to distance
Fig. 3. Error distribution of γ flux obtained using different variance reduction methods
Fig. 4. Lower limit of the weight window wth in the near-ground cell computed using different GVR methods with volume modification (color online)
Fig. 5. Simulated particle number Nps in the near-ground cells simulated using GVR-P method (color online)
Fig. 6. Error distribution of γ flux computed using three GVR methods
Fig. 9. wth in the near-ground cell computed using GVR methods based on information of different particles (color online)
Fig. 10. wth in the near-ground cell computed using GVR methods with different SI values (color online)
Table 1. Main parameters simulated using different variance reduction methods
View tableView in ArticleTable 1. Main parameters simulated using different variance reduction methods
减方差方法Variance reduction FOMG Rave / % Rmax / % σ 直接模拟None 4.6×10-3 20 1 9.3×10-2 局域减方差LVR 0.07 3.7 93 6.7×10-3 无体积修正的全局减方差GVR-F without fvol 1.3×10-3 36 92 6.4×10-2 体积修正的全局减方差GVR-F with fvol 0.18 4.5 14 9.5×10-4
Table 2. Main parameters computed using volume modification and different non-count area modifications
View tableView in ArticleTable 2. Main parameters computed using volume modification and different non-count area modifications
减方差方法Variance reduction FOMG Rave / % Rmax / % σ GVR-F 0.18 4.5 14 9.5×10-4 GVR-F with wth,none=0 0.17 4.5 36 1.1×10-3 非计数区修正的GVR-F
GVR-F with non-count area modification
0.25 4.1 11 6.9×10-4 GVR-R 0.84 1.9 7.3 3.8×10-4 GVR-R with wth,none=0 0.21 2.4 51 2.2×10-3 非计数区修正的GVR-R
GVR-R with non-count area modification
1.03 1.7 7.1 3.1×10-4
Table 3. Main parameters simulated using seven GVR methods (3rd iteration)
View tableView in ArticleTable 3. Main parameters simulated using seven GVR methods (3rd iteration)
GVR FOMG Rave / % Rmax / % σ 加速比Speed ratio None 4.6×10-3 20 1 9.3×10-2 — GVR-R 0.87 1.8 8.5 3.8×10-4 190 GVR-W 10.49 0.6 1.8 1.6×10-5 2 304 GVR-T 2.23 1.3 4.1 8.1×10-5 490 GVR-P 2.55 1.3 3.8 7.2×10-5 561 GVR-E 2.61 1.3 3.6 7.2×10-5 574 GVR-C 3.44 1.1 3.2 5.1×10-5 756 GVR-F 2.58 1.2 4.2 7.3×10-5 566
Table 4. Main parameters computed using GVR methods with different SI values (3rd iteration)
View tableView in ArticleTable 4. Main parameters computed using GVR methods with different SI values (3rd iteration)
SI FOMG Rave / % Rmax / % σ 加速比
Speed ratio
0.4 0.12 4.3 26.0 3.1×10-3 27 0.5 0.87 1.8 8.5 3.8×10-4 190 0.6 4.02 0.9 3.6 7.0×10-5 883 0.7 11.40 0.6 1.8 2.0×10-5 2 503 0.8 14.78 0.5 1.7 1.4×10-5 3 246 0.9 8.99 0.7 2.0 2.1×10-5 1 974 1.0 2.56 1.2 4.2 7.3×10-5 562
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Li LIU, Yinghong ZUO, Shengli NIU, Jinhui ZHU, Peng SHANG, Xuedong WANG. Application of global variance reduction methods for the calculation of γ radiation field in a large space[J]. NUCLEAR TECHNIQUES, 2024, 47(2): 020602
Paper Information
Category: Research Articles
Received: Jul. 4, 2023
Accepted: --
Published Online: Apr. 24, 2024
The Author Email: LIU Li (liuli@nint.ac.cn)
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