SUFT12: Monte Carlo Dosimetry of the 60Co Bebig High Dose Rate Source for Brachytherapy
Abstract
Purpose: The purpose of this work is to obtain the dosimetry parameters in accordance with the AAPM TG43U1 formalism with Monte Carlo calculations regarding the BEBIG 60Co highdoserate brachytherapy. The geometric design and material details of the source was provided by the manufacturer and was used to define the Monte Carlo geometry. Methods: The dosimetry studies included the calculation of the air kerma strength Sk, collision kerma in water along the transverse axis with an unbounded phantom, dose rate constant and radial dose function. The Monte Carlo code system that was used was EGSnrc with a new cavity code, which is a part of EGS++ that allows calculating the radial dose function around the source. The XCOM photon crosssection library was used. Variance reduction techniques were used to speed up the calculation and to considerably reduce the computer time. To obtain the dose rate distributions of the source in an unbounded liquid water phantom, the source was immersed at the center of a cube phantom of 100 cm3. Results: The obtained dose rate constant for the BEBIG 60Co source was 1.108±0.001 cGyh1U1, which is consistent with the values in the literature. The radial dose functions were compared with the valuesmore »
 Authors:
 Universidade do Estado do Rio de Janeiro, Rio De Janeiro, Rio de Janeiro (Brazil)
 Publication Date:
 OSTI Identifier:
 22642262
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Medical Physics; Journal Volume: 43; Journal Issue: 6; Other Information: (c) 2016 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; BRACHYTHERAPY; COBALT 60; CROSS SECTIONS; DOSE RATES; DOSIMETRY; KERMA; MONTE CARLO METHOD; NUCLEAR DATA COLLECTIONS; PHANTOMS; RADIATION DOSES; REACTION KINETICS
Citation Formats
Campos, L T, and Almeida, C E V de. SUFT12: Monte Carlo Dosimetry of the 60Co Bebig High Dose Rate Source for Brachytherapy. United States: N. p., 2016.
Web. doi:10.1118/1.4956146.
Campos, L T, & Almeida, C E V de. SUFT12: Monte Carlo Dosimetry of the 60Co Bebig High Dose Rate Source for Brachytherapy. United States. doi:10.1118/1.4956146.
Campos, L T, and Almeida, C E V de. 2016.
"SUFT12: Monte Carlo Dosimetry of the 60Co Bebig High Dose Rate Source for Brachytherapy". United States.
doi:10.1118/1.4956146.
@article{osti_22642262,
title = {SUFT12: Monte Carlo Dosimetry of the 60Co Bebig High Dose Rate Source for Brachytherapy},
author = {Campos, L T and Almeida, C E V de},
abstractNote = {Purpose: The purpose of this work is to obtain the dosimetry parameters in accordance with the AAPM TG43U1 formalism with Monte Carlo calculations regarding the BEBIG 60Co highdoserate brachytherapy. The geometric design and material details of the source was provided by the manufacturer and was used to define the Monte Carlo geometry. Methods: The dosimetry studies included the calculation of the air kerma strength Sk, collision kerma in water along the transverse axis with an unbounded phantom, dose rate constant and radial dose function. The Monte Carlo code system that was used was EGSnrc with a new cavity code, which is a part of EGS++ that allows calculating the radial dose function around the source. The XCOM photon crosssection library was used. Variance reduction techniques were used to speed up the calculation and to considerably reduce the computer time. To obtain the dose rate distributions of the source in an unbounded liquid water phantom, the source was immersed at the center of a cube phantom of 100 cm3. Results: The obtained dose rate constant for the BEBIG 60Co source was 1.108±0.001 cGyh1U1, which is consistent with the values in the literature. The radial dose functions were compared with the values of the consensus data set in the literature, and they are consistent with the published data for this energy range. Conclusion: The dose rate constant is consistent with the results of Granero et al. and Selvam and Bhola within 1%. Dose rate data are compared to GEANT4 and DORZnrc Monte Carlo code. However, the radial dose function is different by up to 10% for the points that are notably near the source on the transversal axis because of the highenergy photons from 60Co, which causes an electronic disequilibrium at the interface between the source capsule and the liquid water for distances up to 1 cm.},
doi = {10.1118/1.4956146},
journal = {Medical Physics},
number = 6,
volume = 43,
place = {United States},
year = 2016,
month = 6
}

An ytterbium169 high dose rate brachytherapy source, distinguished by an intensityweighted average photon energy of 92.7 keV and a 32.015{+}0.009 day halflife, is characterized in terms of the updated AAPM Task Group Report No. 43 specifications using the MCNP5 Monte Carlo computer code. In accordance with these specifications, the investigation included Monte Carlo simulations both in water and air with the inair photon spectrum filtered to remove lowenergy photons below 10 keV. TG43 dosimetric data including S{sub K}, D(r,{theta}), {lambda}, g{sub L}(r), F(r,{theta}), {phi}{sub an}(r), and {phi}{sub an} were calculated and statistical uncertainties in these parameters were derived and calculatedmore »

Monte Carlo characterization of the M19 high dose rate Iridium192 brachytherapy source
The MCNP5 Monte Carlo code was used to simulate the dosimetry of an M19 iridium192 high dose rate brachytherapy source in both air/vacuum and water environments with the inair photon spectrum filtered to remove lowenergy photons below {delta}=10 keV. Dosimetric data was organized into an awayalong table and was used to derive the updated AAPM Task Group Report No. 43 (TG43U1) parameters including S{sub K}, D(r,{theta}), {lambda}, g{sub L}(r), F(r,{theta}), {phi}{sub an}(r), and {phi}{sub an} and their respective statistical uncertainties. 
Monte Carlo characterization of a new Yb169 high dose rate source for brachytherapy application
Purpose: The objective was to characterize a new Yb169 high dose rate source for brachytherapy application. Methods: Monte Carlo simulations were performed using the MCNP5 F6 energy deposition tallies placed around the Yb169 source at different radial distances in both airvacuum and water environments. The calculations were based on a spherical water phantom with a radius of 50 cm. The output from the simulations was converted into radial dose rate distribution in polar coordinates surrounding the brachytherapy source. Results: The results from Monte Carlo simulations were used to calculate the AAPM Task Group 43 dosimetric parameters: Anisotropy function, radial dosemore » 
{sup 32}P Brachytherapy Conformal Source Model RIC100 for HighDoseRate Treatment of Superficial Disease: Monte Carlo Calculations, Diode Measurements, and Clinical Implementation
Purpose: A novel {sup 32}P brachytherapy source has been in use at our institution intraoperatively for temporary radiation therapy of the spinal dura and other localized tumors. We describe the dosimetry and clinical implementation of the source. Methods and Materials: Dosimetric evaluation for the source was done with a complete set of MCNP5 Monte Carlo calculations preceding clinical implementation. In addition, the depth dose curve and dose rate were measured by use of an electron field diode to verify the Monte Carlo calculations. Calibration procedures using the diode in a customdesigned phantom to provide an absolute dose calibration and tomore » 
PatientSpecific Monte Carlo Dose Calculations for HighDoseRate Endorectal Brachytherapy With Shielded Intracavitary Applicator
Purpose: An integrated software platform was developed to perform a patientspecific dosimetric study on highdoserate {sup 192}Ir endorectal brachytherapy. Monte Carlo techniques were used to examine the perturbation effects of an eightchannel intracavitary applicator with shielding and a liquidinflatable balloon. Such effects are ignored in conventional treatment planning systems that assume waterequivalent geometries. Methods and Materials: A total of 40 Task Group 43based rectal patient plans were calculated using the PTRAN{sub C}T Monte Carlo photon transport code. The silicone applicator, tungsten or lead shielding, contrast solutionfilled balloon, and patient anatomy were included in the simulations. The dose to water andmore »