An EGSnrc Monte Carlo‐calculated database of TG‐43 parameters

Abstract

Monte Carlo methods are used to calculate a complete TG-43 dosimetry parameter data set for 27 low-energy photon emitting brachytherapy sources (18 125I and 9 l03Pd). All Monte Carlo calculations are performed using the EGSnrc user-code BrachyDose. TG-43 dosimetry parameters, including dose rate constants, radial dose functions (with functional fitting parameters), and anisotropy data, are calculated with finer spatial resolution, greater range of distances, and smaller uncertainties than data currently available in the literature for many of these sources. In particular, for most of the seeds, this is the first time that anisotropy data have been tabulated at distances less than 0.5 cm from the source. These calculations employ the state-of-the-art XCOM photon cross sections, and detailed source geometries are modeled using Yegin's multigeometry package. This data set serves as a completely independent verification of the currently available dosimetry parameters calculated using other Monte Carlo codes, including MCNP and PTRAN. This report also describes the Carleton Laboratory for Radiotherapy Physics TG-43 Parameter Database, a publicly accessible web site (at http://www.physics.carleton.ca/clrp/seed_database/) through which all of the data calculated for this study can be accessed. Also available on the web site are descriptions of the methods and Monte Carlo models used in this study and comparisons of data calculated in this study with data calculated by other authors.

Episcleral eye plaque dosimetry comparison for the Eye Physics EP917 using Plaque Simulator and Monte Carlo simulation

“…However, Λ from this study agrees with MC and TLD results reported by Solberg et al (25) within 0.4 and 0.2% respectively and to within 0.1% of recent work by Taylor and Rogers, (17) using point voxel scoring cells. When compared with Λ, calculated using WAFAC voxel scoring cells, Λ from this study is 3.6% higher (17) .…”

“…However, Λ from this study agrees with MC and TLD results reported by Solberg et al (25) within 0.4 and 0.2% respectively and to within 0.1% of recent work by Taylor and Rogers, (17) using point voxel scoring cells. When compared with Λ, calculated using WAFAC voxel scoring cells, Λ from this study is 3.6% higher (17) . When compared with Λ from recently published work by Aryal et al (26) using WAFAC voxel scoring cells and slightly different seed design (simulation condition 11), Λ from this study is 3.9% higher (Table 5).…”

“…When compared with more recent published data from Taylor and Rogers (17) and Aryal et al, (26) the radial dose function values in this work agree to within $\pm 2\%$ over the entire range from 0.5 to 10 cm (Fig. 4).…”

“…When compared with recently published data from Taylor and Rogers, (17) agreement is between $-3.7\%$ and 0.5% for all points, except at 3 and 5 cm at 0°, at which these points disagree by $-5.9\%$ and ‐6.6%, respectively. When compared with recently published data from Aryal et al, (26) agreement is between $-3.3\%$ and 0.5% for all points at angles $\ge {30}^{\circ }$.…”

“…The AgI coating is defined by the volume between the two cylinders. The dimensions used in this model are the same as those used in Meigooni et al (16) and Taylor and Rogers (17) (Fig. 1).…”