Monte Carlo studies of the Tunisian gamma irradiation facility using GEANT4 code

Kadri, O.; Gharbi, F.; Farah, K.; Mannai, K.; Trabelsi, A.

doi:10.1016/j.apradiso.2005.07.009

Cited by 20 publications

(6 citation statements)

References 2 publications

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“…For space application the new GEANT4 based tool GRAS is recently available [4]. There are different radiation protection studies for photon beam technology using GEANT4, see for example [5].…”

Section: Introductionmentioning

confidence: 99%

GEANT4 simulation of electron energy deposition in extended media

Kadri

Ivanchenko

Gharbi

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Introductionmentioning

confidence: 99%

GEANT4 simulation of electron energy deposition in extended media

Kadri

Ivanchenko

Gharbi

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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“…In order to keep the statistical uncertainties associated with the presented estimated results below 1%, 10 6 histories were generated for each simulated run, a value lower than the experimental uncertainty. Simulated dose rate was calculated using the following relation [24]:…”

Section: Methodsmentioning

confidence: 99%

Influence of thyroid volume reduction on absorbed dose in ¹³¹ I therapy studied by using Geant4 Monte Carlo simulation

Rahman¹,

Mirza²,

Arshed³

et al. 2014

Chinese Phys. C

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A simulation study has been performed to quantify the effect of volume reduction on the thyroid absorbed dose per decay and to investigate the variation of energy deposition per decay due to βand γ-activity of 131 I with volume/mass of thyroid, for water, ICRP-and ICRU-soft tissue taken as thyroid material. A Monte Carlo model of the thyroid, in the Geant4 radiation transport simulation toolkit was constructed to compute the βand γ-absorbed dose in the simulated thyroid phantom for various values of its volume. The effect of the size and shape of the thyroid on energy deposition per decay has also been studied by using spherical, ellipsoidal and cylindrical models for the thyroid and varying its volume in 1-25 cm 3 range. The relative differences of Geant4 results for different models with each other and MCNP results lie well below 1.870%. The maximum relative difference among the Geant4 estimated results for water with ICRP and ICRU soft tissues is not more than 0.225%. S-values for ellipsoidal, spherical and cylindrical thyroid models were estimated and the relative difference with published results lies within 3.095%. The absorbed fraction values for beta particles show a good agreement with published values within 2.105% deviation. The Geant4 based simulation results of absorbed fractions for gammas again show a good agreement with the corresponding MCNP and EGS4 results (±6.667%) but have 29.032% higher values than that of MIRD calculated values. Consistent with previous studies, the reduction of the thyroid volume is found to have a substantial effect on the absorbed dose. Geant4 simulations confirm dose dependence on the volume/mass of thyroid in agreement with MCNP and EGS4 computed values but are substantially different from MIRD8 data. Therefore, inclusion of size/mass dependence is indicated for 131 I radiotherapy of the thyroid.

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“…For good statistical results 10 7 histories (number of particles) were generated for each measurement and each measurement was repeated three times. The simulated dose rate was calculated using the following relation [19]:…”

Section: Methodsmentioning

confidence: 99%

Absorbed dose estimations of ¹³¹ I for critical organs using the GEANT4 Monte Carlo simulation code

et al. 2012

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The aim of this study is to compare the absorbed doses of critical organs of 131I using the MIRD (Medical Internal Radiation Dose) with the corresponding predictions made by GEANT4 simulations. S-values (mean absorbed dose rate per unit activity) and energy deposition per decay for critical organs of 131I for various ages, using standard cylindrical phantom comprising water and ICRP soft-tissue material, have also been estimated. In this study the effect of volume reduction of thyroid, during radiation therapy, on the calculation of absorbed dose is also being estimated using GEANT4. Photon specific energy deposition in the other organs of the neck, due to 131I decay in the thyroid organ, has also been estimated. The maximum relative difference of MIRD with the GEANT4 simulated results is 5.64% for an adult's critical organs of 131I. Excellent agreement was found between the results of water and ICRP soft tissue using the cylindrical model. S-values are tabulated for critical organs of 131I, using 1, 5, 10, 15 and 18 years (adults) individuals. S-values for a cylindrical thyroid of different sizes, having 3.07% relative differences of GEANT4 with Siegel & Stabin results. Comparison of the experimentally measured values at 0.5 and 1 m away from neck of the ionization chamber with GEANT4 based Monte Carlo simulations results show good agreement. This study shows that GEANT4 code is an important tool for the internal dosimetry calculations.

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Monte Carlo studies of the Tunisian gamma irradiation facility using GEANT4 code

Cited by 20 publications

References 2 publications

GEANT4 simulation of electron energy deposition in extended media

GEANT4 simulation of electron energy deposition in extended media

Influence of thyroid volume reduction on absorbed dose in ¹³¹ I therapy studied by using Geant4 Monte Carlo simulation

Absorbed dose estimations of ¹³¹ I for critical organs using the GEANT4 Monte Carlo simulation code

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Monte Carlo studies of the Tunisian gamma irradiation facility using GEANT4 code

Cited by 20 publications

References 2 publications

GEANT4 simulation of electron energy deposition in extended media

GEANT4 simulation of electron energy deposition in extended media

Influence of thyroid volume reduction on absorbed dose in 131 I therapy studied by using Geant4 Monte Carlo simulation

Absorbed dose estimations of 131 I for critical organs using the GEANT4 Monte Carlo simulation code

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Influence of thyroid volume reduction on absorbed dose in ¹³¹ I therapy studied by using Geant4 Monte Carlo simulation

Absorbed dose estimations of ¹³¹ I for critical organs using the GEANT4 Monte Carlo simulation code