The use of fricke dosimetry for low energy x-rays

Austerlitz, C; Souza, V. N.; Villar, Heldio P.; Cordilha, Aloisio

doi:10.1590/s1516-89132006000200004

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…This should reduce the total errors below 8% for a submillimetric irradiation field at 1.28 keV. This latter value compares well with the metrological errors determined in liquid Fricke dosimetry for centimetric irradiation field (3-4%), keeping in mind that these errors actually increase when the irradiation field size decreases (Austerlitz et al, 2006). Owing to these errors, the use of liquid dosimeters to map irradiation fields have indeed been limited to macroscopic ones.…”

Section: Discussionsupporting

confidence: 76%

A microfluidic dosimetry cell to irradiate solutions with poorly penetrating radiations: a step towards online dosimetry for synchrotron beamlines

Huart

Nicolas

Penhoat

et al. 2021

J Synchrotron Radiat

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Synchrotron radiation can induce sample damage, whether intended or not. In the case of sensitive samples, such as biological ones, modifications can be significant. To understand and predict the effects due to exposure, it is necessary to know the ionizing radiation dose deposited in the sample. In the case of aqueous samples, deleterious effects are mostly induced by the production of reactive oxygen species via water radiolysis. These species are therefore good indicators of the dose. Here the application of a microfluidic cell specifically optimized for low penetrating soft X-ray radiation is reported. Sodium benzoate was used as a fluorescent dosimeter thanks to its specific detection of hydroxyl radicals, a radiolytic product of water. Measurements at 1.28 keV led to the determination of a hydroxyl production yield, G(HO . ), of 0.025 ± 0.004 µmol J−1. This result is in agreement with the literature and confirms the high linear energy transfer behavior of soft X-rays. An analysis of the important parameters of the microfluidic dosimetry cell, as well as their influences over dosimetry, is also reported.

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Section: Discussionsupporting

confidence: 76%

A microfluidic dosimetry cell to irradiate solutions with poorly penetrating radiations: a step towards online dosimetry for synchrotron beamlines

Huart

Nicolas

Penhoat

et al. 2021

J Synchrotron Radiat

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“…Fricke's solution was used to compare the absorption dose of CP films containing M‐Qu complex to analyze X‐ray radiation absorption capability. The Fe 2+ in the Fricke solution was converted to Fe 3+ using X‐ray energy, 32 and the radiation absorption efficiency was confirmed by measuring the dose change caused by the MQCP film before the X‐ray energy reached the Fricke solution (Figure 7a). X‐ray energy was generated at a voltage of 320 kV and a current of 5 mA in the irradiator, and the MQCP films and Fricke solution samples were irradiated for 1 h. Subsequently, the absorbance of each Fricke solution after X‐ray irradiation was measured at 304 nm to compare the dose‐change rates of the MQCP films.…”

Section: Resultsmentioning

confidence: 98%

Confirmation of radiation interaction with high‐Z metal‐quercetin complex to utilize factor for radiation protection materials

Choi,

Baek,

Choi

et al. 2024

Applied Organom Chemis

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A high‐Z metal‐quercetin complex‐based material is developed by combining Hf, Ta, and Eu with quercetin (Qu) from a flavonoid series to apply to radiation protection materials. To demonstrate radiation energy absorbance, we utilize a polymer blend composed of carboxymethyl cellulose (CMC) and polyvinylpyrrolidone (PVP) as a matrix. This eco‐friendly film can be easily prepared by simply mixing it with the M‐Qu complex and the CMC‐PVP polymer blend. The possibility of radiation energy absorbance by the M‐Qu complex is confirmed through an analysis of the X‐ray energy absorption dose change rate. In addition, the radiation resistance characteristics of each film sample are measured using high‐energy electron‐beam irradiation. The results show that the Ta‐containing Qu complex has a high capability for UV energy downshift, X‐ray radiation absorption, and stability against electron‐beam radiation. This indicates that the material in question has the potential to serve as a superior radiation protection material for broad‐spectrum radiation energy. Also, it could effectively offer remarkable stability making it a compelling option for radiation‐resistant applications.

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“…The Fricke dosimetry method can be used as a primary standard for MeV electrons (Feist 1982, McEwen et al 2014 and the Federal Office of Metrology (METAS, Switzerland) has great experience with this application (Stucki et al 2003a, 2003b, Vörös et al 2012. Furthermore, Fricke detectors have been used as secondary standards for several different applications in photon and electron beams as well as in x-rays (Nahum and Greening 1978, Kuszpet et al 1982, Feist and Muller 1989, Palm and Mattsson 2002, Austerlitz et al 2006, Moussous et al 2011, deAlmeida et al 2014, Moussous and Medjadj 2016.…”

Section: Introductionmentioning

confidence: 99%

Chemical radiation dosimetry in magnetic fields: characterization of a Fricke-type chemical detector in 6 MV photon beams and magnetic fields up to 1.42 T

Trachsel

Pojtinger²,

Meier³

et al. 2020

Phys. Med. Biol.

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In magnetic resonance guided radiotherapy (MRgRT) radiation dose measurements needs to be performed in the presence of a magnetic field. In this study, the influence of magnetic fields on the readings of a Fricke detector, a chemical dosimeter, have been investigated in 6 MV photon beams. This type of detector has been chosen, as the Federal Office of Metrology (METAS, Switzerland) has great experience with Fricke dosimetry and since it is not expected that this detector is greatly affected by the presence of a magnetic field. Magnetic fields with field strengths between 0 T and 1.42 T were applied during the detector irradiation. In a 5 × 10 cm2 irradiation field, the Fricke readings are affected less than 0.9% by the applied magnetic fields. Taking the altered dose distribution due to the magnetic field ( ) into account, the magnetic field correction factors ( ) for the Fricke detector at 0.35 T and 1.42 T are determined to be 0.9948 and 0.9980, respectively. These small corrections hardly exceed the measurement uncertainties. Hence, we could proof that the Fricke detector is not significantly influenced by the presence of a magnetic field. The Fricke detector was also tested for the feasibility of measuring output factors in the presence of magnetic fields. For irradiation field sizes larger than the detector (>2 × 2 cm2), comparable results were obtained as for other detectors. The output factors decrease when a magnetic field is applied. This effect is more pronounce for larger magnetic field strengths and smaller irradiation fields due to shifts of the depth dose curves and asymmetry of lateral dose profiles.

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The use of fricke dosimetry for low energy x-rays

Abstract: The performance of four X-ray qualities generated in a Pantak X-ray machine operating at

Cited by 8 publications

References 2 publications

A microfluidic dosimetry cell to irradiate solutions with poorly penetrating radiations: a step towards online dosimetry for synchrotron beamlines

A microfluidic dosimetry cell to irradiate solutions with poorly penetrating radiations: a step towards online dosimetry for synchrotron beamlines

Confirmation of radiation interaction with high‐Z metal‐quercetin complex to utilize factor for radiation protection materials

Chemical radiation dosimetry in magnetic fields: characterization of a Fricke-type chemical detector in 6 MV photon beams and magnetic fields up to 1.42 T

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