Fricke xylenol gel characterization using a photoacustic technique

Caldeira, A.M.F.; Almeida, Adelaide de; Neto, A. M. J. C.; Baesso, Mauro Luciano; Bento, A. C.; Silva, M.A.

doi:10.1016/j.nima.2007.09.001

Cited by 20 publications

(5 citation statements)

References 21 publications

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“…It has advantages over the liquid solution when spatial resolution and natural oxidation stability are crucial. In addition, the FXG dosimeter allows quantitative and qualitative analysis of the absorbed dose spatial distribution over an irradiated volume [68], [69] with various analysis techniques, including UV/visible spectroscopy [67], [70]–[75], magnetic resonance [64]–[66], [71], [76]–[80], Charge-Coupled Device (CCD) [69], [81]–[90] and photoacoustics [91], [92].…”

Section: Introductionmentioning

confidence: 99%

Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

et al. 2013

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Irradiation of whole blood and blood components before transfusion is currently the only accepted method to prevent Transfusion-Associated Graft-Versus-Host-Disease (TA-GVHD). However, choosing the appropriate technique to determine the dosimetric parameters associated with blood irradiation remains an issue. We propose a dosimetric system based on the standard Fricke Xylenol Gel (FXG) dosimeter and an appropriate phantom. The modified dosimeter was previously calibrated using a 60Co teletherapy unit and its validation was accomplished with a 137Cs blood irradiator. An ionization chamber, standard FXG, radiochromic film and thermoluminescent dosimeters (TLDs) were used as reference dosimeters to determine the dose response and dose rate of the 60Co unit. The dose distributions in a blood irradiator were determined with the modified FXG, the radiochromic film, and measurements by TLD dosimeters. A linear response for absorbed doses up to 54 Gy was obtained with our system. Additionally, the dose rate uncertainties carried out with gel dosimetry were lower than 5% and differences lower than 4% were noted when the absorbed dose responses were compared with ionization chamber, film and TLDs.

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Section: Introductionmentioning

confidence: 99%

Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

et al. 2013

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“…, forming the XO-Fe complex bond, which shows a linearity with the absorbed dose when it is measured by a spectrophotometric system at a range of 575 to 585 nm (5) . The FXG dosimeter can present reproducibility and accuracy (3) .…”

Section: +3mentioning

confidence: 99%

“…In this work the Fricke Xylenol Gel (FXG) is used to measure the dose response (calibration curve) and some physical parameters such as the open and wedged X-ray beam profiles, open electron beam profiles and X-ray output factor for two X-ray energies (6 & 15 MV) and two electron energies (6 & 15 MeV). The FXG has some interesting features such as, broad linear dependence with the absorbed dose from 0.5 up to 30 Gy for γ and x-ray photons (5)(6)(7) . All these absorbance measurements are done with a visible spectrophotometric technique (8,9) .…”

Section: +3mentioning

confidence: 99%

Radiotherapy Measurements Using Fricke Gel Dosimeter

2016

Egypt. J. Biophys. Biomed. Engng.

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HE RADIOTHERAPY is mainly used in cancer treatment. The treatment machines are divided into two types, one is depending on natural sources (e.g cobalt 60 machine) which delivers gamma ray and the other is depending on artificial source such as linear accelerator machine (Linac), they both deliver electron and X-ray with different energies. To calculate treatment dose or to setup a radiotherapy plan for a patient with suitable energy, some parameters must be measured to check the quality and the quantity of this energy. In present study, dosimetric parameters, such as calibration curve, open and wedged beam profiles and total scatter factors, are evaluated for two mega voltage photons "X-ray" (6 & 15 MV) and two electrons (6 & 15 MeV) beam energies using a chemical dosimeters such as Fricke Xylenol Gel dosimeter (FXG). The measurements are compared with other dosimeters such as ionization chambers and daily QA machine. The aim of this work is to evaluate the FXG to be used in measuring these parameters and acts as alternative dosimeter used in daily quality assurance checks. The results show that the differences of these parameters between the standard dosimeters (Ionization chambers and daily QA machine) are not more than 3%.

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“…It has advantages over the liquid solution when spatial resolution and natural oxidation stability are crucial. In addition, the FXG dosimeter allows quantitative and qualitative analysis of the absorbed dose spatial distribution over an irradiated volume [68,69] with various analysis techniques, including UV/visible spectroscopy [67,[70][71][72][73][74][75], magnetic resonance [64][65][66]71,[76][77][78][79][80], Charge-Coupled Device (CCD) [69,[81][82][83][84][85][86][87][88][89][90] and photoacoustics [91,92].…”

Section: Introductionmentioning

confidence: 99%

Correction: Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

Lama¹,

GÃ3es²,

Petchevist³

et al. 2014

PLoS ONE

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Irradiation of whole blood and blood components before transfusion is currently the only accepted method to prevent Transfusion-Associated Graft-Versus-Host-Disease (TA-GVHD). However, choosing the appropriate technique to determine the dosimetric parameters associated with blood irradiation remains an issue. We propose a dosimetric system based on the standard Fricke Xylenol Gel (FXG) dosimeter and an appropriate phantom. The modified dosimeter was previously calibrated using a 60 Co teletherapy unit and its validation was accomplished with a 137 Cs blood irradiator. An ionization chamber, standard FXG, radiochromic film and thermoluminescent dosimeters (TLDs) were used as reference dosimeters to determine the dose response and dose rate of the 60 Co unit. The dose distributions in a blood irradiator were determined with the modified FXG, the radiochromic film, and measurements by TLD dosimeters. A linear response for absorbed doses up to 54 Gy was obtained with our system. Additionally, the dose rate uncertainties carried out with gel dosimetry were lower than 5% and differences lower than 4% were noted when the absorbed dose responses were compared with ionization chamber, film and TLDs.

show abstract

Fricke xylenol gel characterization using a photoacustic technique

Cited by 20 publications

References 21 publications

Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

Radiotherapy Measurements Using Fricke Gel Dosimeter

Correction: Prevention of Transfusion-Associated Graft-versus-Host Disease by Irradiation: Technical Aspect of a New Ferrous Sulphate Dosimetric System

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