Full characterization of a compact 90Sr/90Y beta source for TID radiation testing

Capua, F. Di; Campajola, L.; Casolaro, Pierluigi; Campajola, M.; Aloisio, A.; Lucaroni, A.; Furano, Gianluca; Menicucci, A.; Mascio, Stefano Di; Malatesta, Fabio; Ottavi, Marco

doi:10.1016/j.asr.2019.01.037

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…The blue dots refer to the spectra of the RCF not exposed to the radiation, whereas the other spectra refer to doses of 4.3, 20, and 43 Gy. These acquisitions have been performed with a 38 MBq 90 Sr/ 90 Y β source [19]. The intensity of the spectrum at 4.3 Gy (magenta) at wavelength λ = 500 nm decreases by 5% with respect to the spectrum at 0 Gy spectrum (cyan) at the same wavelength.…”

Section: Resultsmentioning

confidence: 99%

An Innovative Real-Time Dosimeter for Radiation Hardness Assurance Tests

Campajola

Casolaro

Gandolfo

et al. 2022

Physics

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The study of the effects of the radiation dose on devices and materials is a topic of high interest in several fields, including radiobiology, space missions, microelectronics, and high energy physics. In this paper, a new method, based on radiochromic film dosimetry, is proposed for real-time dose assessment in radiation hardness assurance tests. This method allows for correlating the radiation dose at which devices are exposed to the radiation effects (malfunctioning and/or breakdown). In previous studies, it has already been demonstrated that a system, based on optical fibers and a spectrometer, allows for the real-time dose assessment of radiochromic films. The current study not only validates our previous results, but shows that it is possible to apply the new method to an actual radiation environment for the real-time measurement of the dose delivered to a device in radiation hardness assurance tests. This new dosimeter can be used in different radiation environments for a wide dose range, from a few Gy to a few MGy. This high sensitivity can be reached by changing the radiochromic film type and/or the parameters used for the analysis.

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Section: Resultsmentioning

confidence: 99%

An Innovative Real-Time Dosimeter for Radiation Hardness Assurance Tests

Campajola

Casolaro

Gandolfo

et al. 2022

Physics

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“…We already demonstrated the validity of this equation as the calibration equation for B3 films, EBT3 and HDV-2 Gafchromic films analyzed with commercial scanners. 14 In this work, we exposed an XR-QA2 Gafchromic film to beta rays from 90 Sr/ 90 Y source. The reading of the darkening of the film was performed in real-time by means of the new opto-electronic based method.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we proposed the absolute calibration equation for all RCF types. 14,15 This equation, the Green-Saunders equation, has a general validity since it is the physical law that describes the phenomenon of the film darkening. The fitting parameters of this function have therefore a precise physical meaning related in particular to the film's contrast and dynamics.…”

Section: Introductionmentioning

confidence: 99%

Absolute calibration for film dosimetry

Casolaro

Campajola

Breglio

et al. 2020

Int. J. Mod. Phys. Conf. Ser.

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Recent results in the field of film dosimetry demonstrated that the Green–Saunders equation, a solution of the logistic equation describing phenomena of kinetics of chemical reactions, is the absolute calibration function for all radiochromic film types. Taking advantage of the new opto-electronics-based radiochromic film reading method, which allows real-time measurements of the spectral response of radiochromic films, we confirm that the film darkening is ruled by the Green–Saunders equation independently both from the reading instrument or the choice of the observable used for the calibration. In order to demonstrate it, we exposed an XR-QA2 Gafchromic film to 90Sr/90Y beta rays up to 1400 mGy. Film spectra are recorded in real-time. The calibration is performed by means of two analytic methods: evaluation of the integral under the curves from 500 nm to 645 nm and evaluation of the intensity at 570, 600 and 643 nm. Experimental data fit to the Green–Saunders equation for both methods.

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“…The primary application field is in medical physics for dosimetry checks of accelerator beams for particle and radiation therapy [1][2][3]. Its use in industrial applications as material irradiation, food sterilization and radiation hardness is also confirmed by several works [4][5][6][7][8]. In all these applications RCFs are used not only as dosimeters but also as instruments which are capable of providing high-resolution 2D spatial distribution of the radiation field.…”

Section: Introductionmentioning

confidence: 98%

The physics of radiochromic process: one calibration equation for all film types

2019

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A: A unique calibration equation for all radiochromic film types is proposed. The determination of this equation comes from an analogy that the authors made between the radiochromic and photographic processes. Photography dynamics is ruled by a differential equation, the logistic equation, describing phenomena of growth versus competition. A solution of the logistic equation is the Green-Saunders equation which was used for the first time by the same authors in a previous referred work for the calibration of a set of EBT3 Gafchromic films. Since this equation has a fundamental physical interpretation, the fitting parameters also represent important physical quantities and two of them in particular fix the film dynamics; one being the contrast and the other the abscissa of the inflection point of the sensitometric curve. In order to show the validity of this approach for more than one radiochromic film type, two sets of radiochromic films, the B3 and HD-V2 Gafchromic films were exposed to several known doses and the Green-Saunders equation was found to perfectly fit the experimental data. A comparison with the same procedure used for EBT3 Gafchromic films is proposed. The findings of this work are an important step forward in the understanding of an interesting and widely used dosimetry technique.

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Full characterization of a compact 90Sr/90Y beta source for TID radiation testing

Cited by 4 publications

References 5 publications

An Innovative Real-Time Dosimeter for Radiation Hardness Assurance Tests

An Innovative Real-Time Dosimeter for Radiation Hardness Assurance Tests

Absolute calibration for film dosimetry

The physics of radiochromic process: one calibration equation for all film types

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