Characterization of a  unit at a secondary standard dosimetry laboratory: Monte Carlo simulations compared to measurements and results from the literature

Tedgren, Åsa Carlsson; Luelmo, Sandro de; Grindborg, Jan-Erik

doi:10.1118/1.3392198

Cited by 15 publications

(12 citation statements)

References 15 publications

(29 reference statements)

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“…The source is a point source collimated into a 10 × 10 cm 2 field size at the surface of the phantom with the Source Surface Distance (SSD) of 100 cm. For validation purposes, the calculation for Exradin A1SL in reference condition was repeated using the phase space files of the 60 Co radiation unit used by the secondary standard dosimetry laboratory at The Swedish Radiation Safety Authority (SSM) in Stockholm …”

Section: Methodsmentioning

confidence: 99%

“…For validation purposes, the calculation for Exradin A1SL in reference condition was repeated using the phase space files of the 60 Co radiation unit used by the secondary standard dosimetry laboratory at The Swedish Radiation Safety Authority (SSM) in Stockholm. 14 For the calculations with the msr field, the previously generated LGK Perfexion TM phase space file 1 for msr field (16 mm size) is used as an input radiation source in this study. The half-sphere water phantom designed by Drzymala et al, 15 the solid water LGK Dosimetry Phantom 16 and the Elekta acrylonitrile butadiene styrene (ABS) phantom used frequently in the calibration of LGK Perfexion TM model were simulated in EGSnrc and PENELOPE Monte Carlo codes.…”

Section: A Simulation Setup and Parametersmentioning

confidence: 99%

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Determination of factors for ion chambers used in the calibration of Leksell Gamma Knife Perfexion model using EGSnrc and PENELOPE Monte Carlo codes

et al. 2018

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Section: Methodsmentioning

confidence: 99%

Section: A Simulation Setup and Parametersmentioning

confidence: 99%

Determination of factors for ion chambers used in the calibration of Leksell Gamma Knife Perfexion model using EGSnrc and PENELOPE Monte Carlo codes

et al. 2018

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“…1. Fig ure 1 pres ents ex per i men tal set-up for the lat eral beam pro files and geo met ric struc ture of the ir ra di a tion sys tem [15]. Mea sure ments at one po si tion were con ducted 10 times per min ute.…”

Section: Gamma-ray Ir Ra DI a Tion Con Di Tionsmentioning

confidence: 99%

Measurement of absorbed dose rate in water phantom maintained at body temperature by 60Co irradiator – comparison of experimental results and Monte Carlo simulation

et al. 2021

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To analyze the biological effects of radiation, it is important that the conditions of in vitro experiments match closely with those of in vivo experiments. In this study, we constructed an irradiation system to conduct irradiation experiments under conditions similar to those of in vivo experiments. The Dongnam Institute of Radiological and Medial Sciences has a gamma irradiator including 60Co radioisotope for research purposes and accreditation for standard calibration of the ion chamber. The temperature of the water phantom was maintained the same as that of the normal human body, and the physical dosimetry was carried out accurately using the ion chamber with traceability. We report the measurement of lateral profiles, depth profiles, and absorbed dose rate in water, Dw, at the irradiation location of the blood samples using a farmer-type ion chamber. We simulated the source, collimator, irradiator, phantom, and extra structure of the gamma irradiation system using the Monte Carlo code and compared the simulated and the experimental results. The experimentally and theoretically evaluated dose rates were 0.2975 ? 0.0055 Gymin?1 (at coverage factor k = 2) and 0.2978 ? 0.0052 Gymin?1 (at coverage factor k = 2) at source-to-surface distance of 100 cm and 5 gcm?2 depth in the water phantom, respectively. Blood irradiation will be conducted in vitro, under conditions similar to in vivo conditions, to provide the dose-response curve based on dosimetry with traceability.

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“…The radiation field analyzer is used for the measurement of the depth-dose data and dose profiles for the purpose of input data in treatment planning system. Several authors have performed the simulation of various telecobalt units for the study of dosimetry parameters [5]- [12]. Mora et al studied the relative air kerma, influence of collimation system on the photon spectra, and the effect of electron contamination in output in Eldorado telecobalt unit using BEAMnrc code [6].…”

Section: Introductionmentioning

confidence: 99%

“…performed the simulation of 60 Co unit at secondary standard dosimetry laboratory for comparison of results with the measurement data [12].…”

Section: Introductionmentioning

confidence: 99%

Radiation Beam Characterization and Dosimetry of Theratron Equinox-80 Telecobalt Machine Using BEAMnrc Monte Carlo Simulation Code

Patel¹,

Balasubramanian²,

Atri³

et al. 2016

IJMPCERO

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The BEAMnrc code was used for the simulation of the Theratron Equinox-80 telecobalt machine. The phase space of radiation beam was generated at treatment distance of 80 cm for various field sizes. The phase spaces in air were analyzed by BEAMdp data processing program. The electron energy fluence with respect to photon energy was 0.09% and 0.34% for field size of 05 × 05 and 35 × 35 cm 2 respectively and it was maximum at the central axis which gradually decreases beyond this. The profiles for photon fluence were in symmetry for all the fields. The full width at half maximum of profiles in photon energy fluence shows good agreement with the field size. The photon energy fluence was flat till the field size of 27 cm 2 , after which it decreases gradually till the edge in larger field sizes. The air-kerma output factor from the simulation was in good agreement with measured value. We analyzed the dose data scored in the voxels in a large water phantom by simulation using dosxyznrc code. The percentage depth dose for all field sizes was in good agreement with the BJR supplement 25 and the data supplied by the manufacturer of machine. Significant deviation of about 20% in isodose line near the edge of the profile was observed for 35 × 35 cm 2 field size. The penumbra widths of all field sizes were comparable except for 35 × 35 cm 2 , which has a penumbra width of 4.1 cm at 10 cm depth. The significant under dose near the edge as compared to central axis for larger field sizes may be the indication for its careful use in treatment.

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Characterization of a unit at a secondary standard dosimetry laboratory: Monte Carlo simulations compared to measurements and results from the literature

Cited by 15 publications

References 15 publications

Determination of factors for ion chambers used in the calibration of Leksell Gamma Knife Perfexion model using EGSnrc and PENELOPE Monte Carlo codes

Determination of factors for ion chambers used in the calibration of Leksell Gamma Knife Perfexion model using EGSnrc and PENELOPE Monte Carlo codes

Measurement of absorbed dose rate in water phantom maintained at body temperature by 60Co irradiator – comparison of experimental results and Monte Carlo simulation

Radiation Beam Characterization and Dosimetry of Theratron Equinox-80 Telecobalt Machine Using BEAMnrc Monte Carlo Simulation Code

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