Anisotropic diffusion of Fe ions in Fricke-XO-Pluronic F-127 and Fricke-XO-gelatine 3D radiotherapy dosimeters

Dudek, Mariusz; Piotrowski, M.; Maras, Piotr; Jaszczak, Malwina; Kozicki, Marek

doi:10.1088/1361-6560/ac101e

Cited by 17 publications

(18 citation statements)

References 55 publications

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“…However, it should be emphasized that the reading of the dosimeter is done shortly after irradiation (when used as a 3D dosimeter) not only due to its poor storage stability, but also due to likely anisotropic diffusion of the irradiated part over time of storage under gravitational force. The anisotropic diffusion was shown recently in another work [ 39 ] not only for Fricke–XO–Pluronic F–127 but also for Fricke−XO−gelatine dosimeter. Fast scanning of the Fricke-based 3D dosimeters with nonzero [XO-Fe] +3 diffusion coefficients after irradiation should eliminate problems related to storage stability and diffusion anisotropicity of irradiated regions.…”

Section: Discussionmentioning

confidence: 52%

“…To this point, one attempt has been made to prepare and test a Fricke dosimeter with a Pluronic F–127 matrix [ 39 ] in accordance with the literature suggestions for composition. In this work, however, only the issue related to the possible anisotropic diffusion of [XO-Fe] +3 complexes formed after irradiation in Fricke–XO–Pluronic F–127 relative to the Fricke−XO−gelatine dosimeter was examined.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Optimal Composition and Storage Conditions of the Fricke–XO–Pluronic F–127 Radiochromic Dosimeter

et al. 2022

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This paper presents the results of research on the Fricke–XO–Pluronic F–127 dosimeter. It consists of a Fricke dosimetric solution and xylenol orange (XO), which are embedded in a matrix of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F–127). Upon irradiation, Fe+2 ions transform into Fe+3, forming a colored complex with XO ([XO-Fe]+3). The color intensity is related to the dose absorbed. The optimal composition, storage conditions, and radiation-induced performance of the Fricke–XO–Pluronic F–127 dosimeter were investigated. The optimal composition was found to be 1 mM FAS, 50 mM sulfuric acid (H2SO4), 0.165 mM XO in 25% Pluronic F–127. The basic features of this dosimeter are discussed, such as dose sensitivity, linear and dynamic dose range, stability before and after irradiation, storage conditions, dose response for irradiation with 6 and 15 MV photons, and batch-to-batch reproducibility. The obtained results showed a certain potential of the Fricke–XO–Pluronic F–127 for radiotherapy dosimetry.

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Section: Discussionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Study of the Optimal Composition and Storage Conditions of the Fricke–XO–Pluronic F–127 Radiochromic Dosimeter

et al. 2022

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“…It stands for standard outdoor illumination conditions in different parts of the world. The spectrum of the illuminant was measured and discussed elsewhere [ 25 ]. To eliminate imperfections in the cabinet walls and provide adequate background for the irradiated samples, its inferior was covered with black paper sheets.…”

Section: Methodsmentioning

confidence: 99%

Features of PABIGnx 3D Polymer Gel as an Ionising Radiation Dosimeter

2022

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This work presents the features of the PABIGnx 3D polymer gel dosimeter. It consists of two cross-linkers: poly(ethylene glycol) diacrylate (PEGDA), as one biacrylic component, and N,N′-methylenebisacrylamide (MBA), which is another cross-linker often used in 3D dosimeters. Additionally, it contains oxygen scavenges of copper sulfate pentahydrate and ascorbic acid. All ingredients are embedded in a physical gel matrix of gelatine. Upon irradiation, the biacrylic cross-linking agents (PEGDA and MBA) undergo radical polymerisation and cross-linking, which is manifested by the appearance of the opacity of the intensity related to the absorbed dose. PABIGnx was irradiated with an oncological source of ionising radiation, and analysed by using a nuclear magnetic resonance (0.5 T). The following characteristics were obtained: (i) linear and dynamic dose-response of 0.5 to ~18 Gy and 40 Gy, respectively, (ii) dose sensitivity of 0.071 ± 0.001 Gy−1 s−1, (iii) integral 3D dose distribution for at least 24 days after irradiation, (iv) adequate batch-to-batch reproducibility, (v) dose-response independent of irradiation with 6 MV photons, 15 MV photons, 6 MV photons FFF of 0.0168–0.1094 Gy/s dose rates, and (vi) soft tissue equivalence. The study showed that the features of PABIGnx confirm its suitability for use in 3D radiotherapy dosimetry.

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“…Recently, a new Fricke-XO dosimeter with a matrix of poly(ethylene oxide)- block -poly(propylene oxide)- block -poly(ethylene oxide) (Pluronic F-127) [ 23 , 24 ] has been developed and described. Pluronic F-127 forms a physical gel characterized by a high degree of transparency and colorlessness.…”

Section: Introductionmentioning

confidence: 99%

Impact of Salt on Thermal Stability and Dose Response of the Fricke-XO-Pluronic F-127 3D Radiotherapy Dosimeter

et al. 2022

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Fricke-XO-Pluronic F-127 has recently been proposed as a 3D dosimeter for radiotherapy. It contains the typical ingredients of the Fricke ionizing radiation dosimeter, which are embedded in a physical gel of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127). The main reactions upon irradiation are the conversion of Fe+2 to Fe+3 and the formation of a colored complex with XO ([XO-Fe]+3). The study attempts to optimize the dosimeter in terms of its solution-to-gel transition temperature. In order to lower this temperature, the use of NaCl salt has been proposed. The new composition was characterized in order to obtain information on its thermal performance, storage stability, dose response to irradiation with a medical accelerator emitting different types of radiation, and tissue equivalence. The results obtained show an improvement in the sol-gel transition temperature and dose sensitivity compared to the composition without NaCl and broaden the knowledge of the Fricke-XO-Pluronic F-127.

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Anisotropic diffusion of Fe ions in Fricke-XO-Pluronic F-127 and Fricke-XO-gelatine 3D radiotherapy dosimeters

Cited by 17 publications

References 55 publications

Study of the Optimal Composition and Storage Conditions of the Fricke–XO–Pluronic F–127 Radiochromic Dosimeter

Study of the Optimal Composition and Storage Conditions of the Fricke–XO–Pluronic F–127 Radiochromic Dosimeter

Features of PABIGnx 3D Polymer Gel as an Ionising Radiation Dosimeter

Impact of Salt on Thermal Stability and Dose Response of the Fricke-XO-Pluronic F-127 3D Radiotherapy Dosimeter

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