The Study of Dosimetric Characteristics of the XHA600D Medical Linear Accelerator Based on a Monte Carlo Code

Table 6

The simulated and measured values for various field sizes at the depth of for FF and FFF beams. (The uncertainties of simulated values in FF mode of 4 × 4, 6 × 6, 8 × 8, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 cm² fields were as follows: 0.3%, 0.3%, 0.4%, 0.4%, 0.5%, 0.7%, 0.8%, 1% (k = 2). The uncertainties of simulated values in FFF mode of 4 × 4, 6 × 6, 8 × 8, 10 × 10, 15 × 15, 20 × 20, 25 × 25, 30 × 30 cm² fields were as follows: 0.3%, 0.3%, 0.4%, 0.4%, 0.5%, 0.6%, 0.6%, 0.8% (k = 2).).

Field size (cm^2)	FF			FFF
	Simulated	Measured	Diff. (%)	Simulated	Measured	Diff. (%)
4 × 4	0.932	0.933	−0.107	0.951	0.953	−0.210
6 × 6	0.963	0.962	0.104	0.977	0.976	0.102
8 × 8	0.977	0.984	−0.711	0.987	0.987	0.00
10 × 10	1.00	1.00	—	1.00	1.00	—
15 × 15	1.02	1.03	−0.971	1.03	1.02	0.980
20 × 20	1.05	1.04	0.962	1.04	1.04	0.00
25 × 25	1.06	1.06	−0.00	1.06	1.05	0.952
30 × 30	1.07	1.06	0.943	1.07	1.06	0.943