Figure 1.
a) External view of the flask. The lateral openings are used to insert and remove the solution. b) Cross-sectional view of the flask, with external and internal dimensions. A: ring-shaped disc (18 mm); B: source length (3.50 mm); C: source diameter (0.60 mm); D: source-holder diameter (1.06 mm); E and F: PMMA wall thicknesses (1.27 mm and 1.62 mm); G and H: internal and external diameter of the vessel (45.09 mm and 54.19 mm).
Figure 2.
The interpolated LET value for the 192Ir average energy using published data [22], [23] and two different curve fittings.
Table 1.
Numerical values of the coefficients for the aqueous 0.4 M H2SO4 used in the formalism proposed by Meesungnoen et al. [23].
Figure 3.
The G value was estimated based on published values and the use of the energy weights for the 192Ir photon fluence calculated by MC simulations. Full circles are the values reported by Klassen et al. [16], full squares are those reported by Fregene [25], and the solid line is all of the data fitted in this work.
Figure 4.
The absorbed dose to water values measured with Fricke dosimetry versus the nominal dose measured by a Farmer-type ionization chamber. The X-axis represents the measured absorbed dose values with the ionization chamber, and the Y-axis represents the measured absorbed dose values with the Fricke system with a total uncertainty of 1.4%, both for k = 1.
Table 2.
Uncertainty budget in the determination of Dw using the Fricke solution.