Monte Carlo-based Investigation of Absorbed-dose Energy Dependence of Thermoluminescent Dosimeters in Therapeutic Proton and Carbon Ion Beams.

Background: The present study is aimed at calculating relative absorbed-dose energy response correction () of commonly used thermoluminescent dosimeters (TLDs) such as LiF, LiBO, and AlO as a function of depth in water for protons (50-250 MeV/n) and carbon ion (80-480 MeV/n) beams using Monte Carlo-based FLUKA code.

Materials And Methods: On-axis depth-dose profiles in water are calculated for protons (50-250 MeV/n) and carbon ion (80-480 MeV/n) beams using FLUKA code. For the calculation of , selective depths are chosen based on the depth-dose profiles.

Monte Carlo-based dosimetry of proposed bi-radionuclide (I and Ru/Rh) eye plaque: A feasibility study.

Background: Combining the sharp dose fall off feature of beta-emitting Ru/Rh radionuclide with larger penetration depth feature of photon-emittingI radionuclide in a bi-radionuclide plaque, prescribed dose to the tumor apex can be delivered while maintaining the tumor dose uniformity and sparing the organs at risk. The potential advantages of bi-radionuclide plaque could be of interest in context of ocular brachytherapy.

Purpose: The aim of the study is to evaluate the dosimetric advantages of a proposed bi-radionuclide plaque for two different designs, consisting of indigenous I seeds and Ru/Rh plaque, using Monte Carlo technique.

Monte Carlo Study on Dose Distributions Around Ir, Yb, and I Brachytherapy Sources Using EGSnrc-based egs_brachy User-code.

Introduction: As per the recommendations of the American Association of Physicists in Medicine Task Group 43, Monte Carlo (MC) investigators should reproduce previously published dose distributions whenever new features of the code are explored. The purpose of the present study is to benchmark the TG-43 dosimetric parameters calculated using the new MC user-code egs_brachy of EGSnrc code system for three different radionuclides Ir, Yb, and I which represent high-, intermediate-, and low-energy sources, respectively.

Materials And Methods: Brachytherapy sources investigated in this study are high-dose rate (HDR) Ir VariSource (Model VS2000), Yb HDR (Model 4140), and I -low-dose-rate (LDR) (Model OcuProsta).

EGSnrc-based depth-dependent photon energy response and phantom scatter corrections for low-energy brachytherapy sources.

In the present study, beam quality correction, [Formula: see text], and phantom scatter correction, k(r), for low-energy brachytherapy sources, Cs, I, and Pd, are calculated using the Monte Carlo-based EGSnrc code system as a function of the distance along the transverse axis of the source. The solid-state detectors investigated are diamond, LiF, LiBO, AlO, and radiochromic films, such as HS, EBT, EBT2, EBT3, RTQA, XRT, and XRQA. The solid phantoms investigated are polystyrene, PMMA, virtual water, solid water, plastic water (LR), A150, RW1, RW3, and WE210.

Comparison of Measured and Monte Carlo Calculated Dose Distributions from Indigenously Developed 6 MV Flattening Filter Free Medical Linear Accelerator.

Purpose: Monte Carlo simulation was carried out for a 6 MV flattening filter-free (FFF) indigenously developed linear accelerator (linac) using the BEAMnrc user-code of the EGSnrc code system. The model was benchmarked against the measurements. A Gaussian distributed electron beam of kinetic energy 6.

Monte Carlo Investigation of Photon Beam Characteristics and its Variation with Incident Electron Beam Parameters for Indigenous Medical Linear Accelerator.

Purpose: A Monte Carlo model of a 6 MV medical linear accelerator (linac) unit built indigenously was developed using the BEAMnrc user code of the EGSnrc code system. The model was benchmarked against the measurements. Monte Carlo simulations were carried out for different incident electron beam parameters in the study.

Monte Carlo Calculation of Beam Quality and Phantom Scatter Corrections for Lithium Formate Electron Paramagnetic Resonance Dosimeter for High-energy Brachytherapy Dosimetry.

Purpose: To investigate beam quality correction, () and phantom scatter correction, () for lithium formate dosimeter as a function of distance r along the transverse axis of the high-energy brachytherapy sources Co, Cs, Ir and Yb using the Monte Carlo-based EGSnrc code system.

Materials And Methods: The brachytherapy sources investigated in this study are BEBIG High Dose Rate (HDR) Co (model Co0.A86), Cs (model RTR), HDR Ir (model Microselectron) and HDR Yb (model 4140).

Phantom scatter corrections of radiochromic films in high-energy brachytherapy dosimetry: a Monte Carlo study.

Our aim in this study was to calculate Monte Carlo-based phantom scatter corrections of various radiochromic films for different solid phantoms for high-energy brachytherapy sources. Brachytherapy sources (60)Co, (137)Cs, (192)Ir, and (169)Yb and radiochromic films EBT, EBT2 (lot 020609 and lot 031109), RTQA, XRT, XRQA, and HS were investigated in this study. The solid phantom materials investigated were PMMA (polymethylmethacrylate), polystyrene, solid water, virtual water, plastic water, RW1, RW3, A150, and WE210.

Monte Carlo-based beam quality and phantom scatter corrections for solid-state detectors in 60Co and 192Ir brachytherapy dosimetry.

Beam quality correction, kQQ0(r), for solid-state detectors diamond, LiF, Li2B4O7, Al2O3, and plastic scintillator are calculated as a function of distance, r, along the transverse axis of the 60Co and 192Ir brachytherapy sources using the Monte Carlo- based EGSnrc code system. This study also includes calculation of detector-specific phantom scatter correction, kphan(r), for solid phantoms such as PMMA, polysty- rene, solid water, virtual water, plastic water, RW1, RW3, A150, and WE210. For 60Co source, kQQ0(r) is about unity and distance-independent for diamond, plastic scintillator, Li2B4O7 and LiF detectors.

Monte Carlo-based investigation of water-equivalence of solid phantoms at (137)Cs energy.

Investigation of solid phantom materials such as solid water, virtual water, plastic water, RW1, polystyrene, and polymethylmethacrylate (PMMA) for their equivalence to liquid water at (137)Cs energy (photon energy of 662 keV) under full scatter conditions is carried out using the EGSnrc Monte Carlo code system. Monte Carlo-based EGSnrc code system was used in the work to calculate distance-dependent phantom scatter corrections. The study also includes separation of primary and scattered dose components.

Monte Carlo-based investigation of absorbed-dose energy dependence of radiochromic films in high energy brachytherapy dosimetry.

Relative absorbed dose energy response correction, R, for various radiochromic films in water phantom is calculated by the use of the Monte Carlo-based EGSnrc code system for high energy brachytherapy sources 60Co, 137Cs, 192Ir and 169Yb. The corrections are calculated along the transverse axis of the sources (1-15 cm). The radiochromic films investigated are EBT, EBT2 (lot 020609 and lot 031109), RTQA, XRT, XRQA, and HS.

Monte Carlo calculation of beam quality correction for solid-state detectors and phantom scatter correction at 137Cs energy.

Beam quality correction kQQo (r), which reflects the absorbed energy dependence of the detector, is calculated for solid state detector materials diamond, LiF, Li2B4O7 and Al2O3 for the 137Cs RTR brachytherapy source using the Monte Carlo-based EGSnrc code system. The study also includes calculation of detector-specific phantom scatter corrections kphant (r) for solid phantoms such as PMMA, polystyrene, RW1, solid water, virtual water and plastic water. Above corrections are calculated as a function of distance r along the transverse axis of the source.