TABLE 1.

Absorbed Fraction of Uniformly Distributed ¹³¹I Source in Various Sizes of Spheres Filled with Water as Medium

Sphere R (cm)	131I β*	Voxel sphere*	Ref. A†	Sphere R (cm)	131Iγ‡	Voxel sphere‡	Ref. B§
0.1	0.71	—∥	0.73	1.0	0.025	0.028	0.025
0.2	0.85	0.87	N/A	2.0	0.049	0.048	0.049
0.25	0.88	0.90	0.89	4.0	0.099	0.101	0.099
0.5	0.94	0.96	0.94	6.0	0.149	0.149	0.151
1.0	0.97	0.98	0.97	8.0	0.197	0.197	0.197
2.0	0.99	0.98	0.98	10.0	0.244	0.244	0.244
				12.0	0.287	0.288	0.288
				14.0	0.329	0.328	0.329

^*NPS = 10,000; relative errors < 10%.

^†Akabani et al. (32).

^‡NPS = 50,000; relative errors < 10%.

^§Furhang et al. (33).

^∥Sphere with 0.1-cm radius is below resolution of (0.4 cm)³ voxel.

NPS = number of histories; N/A = not applicable.