Simulation geometry of the left FSD ovoid. Component (A) is the anterior shielding segment, which has a thickness of 0.5 cm and width of 0.5 cm and is positioned 0.4 cm laterally from the center of the ovoid. Component (B) is the posterior shielding segment, which has a thickness of 0.5 cm and diameter of 1.8 cm and is positioned at a 45° angle in the ovoid. The anterior and posterior shields were constructed of densimet 17. This is a tungsten alloy of composition 90.5% W, 6.5% Ni, and 3% Fe and density of .
Comparison of FSD ovoid dose calculations for shielded and unshielded geometries (A). The dashed lines are the unshielded calculations while the solid lines are the shielded calculations. (B) is a plot of the transmission through the shields.
Optical density to dose curve for the ovoid irradiation. The solid line is a second order polynomial fit to the data .
Monte Carlo calculation vs radiochromic film comparison for the left ovoid. Isodose lines are in units of Gy. Dashed lines are the film measurements, while the solid lines are the Monte Carlo calculations.
vs dose curve for the ovoid irradiation. The solid line is a second order polynomial fit to the data . This figure reprinted with permission from K Gifford et al., J. Phys.: Conf. Ser. 3, 217–220 (2004) [Journal of Physics: Conference Series] © 2004 IOP Publishing Ltd.
Monte Carlo calculation vs normoxic gel comparison for the right ovoid. Solid lines are the Monte Carlo calculations. Dashed lines indicate the gel measurements.
Composition of 1000 g of 5% methacrylic acid gel.
Composition and density of materials used in the Monte Carlo calculations.
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