Multilayer Shielding Design for Intermediate Radioactive Waste Storage Drums: A Comparative Study between FLUKA and QAD-CGA

Table 4

Comparison of the calculation cost and efficiency of FLUKA.

	Total time	Average CPU time for a primary particle	Total number of particles	Parallel number		FOM factor (1/s)
Case 1	4.625 h	1.67E-04s	1E8	1	0.62%	1.56
Case 2	25.5 h	1.84E-04s	5E8	1	0.33%	1.00
Case 3	5 d	2.16E-03	1.00E+09	5	0.44%	0.024
Case 4^a	9 d	3.70E-03	1.80E+09	9	0.53%	0.005
Case 4^b	25.6 h	9.23E-04	1.00E+08	1	0.98%	0.11

a: direct calculation.
b: optimized setting and VRT adopted.
c here gives the maximum statistical relative error of the dose calculation matrix.