Quantification of 37Ar emanation fractions from irradiated natural rock samples and field applications

Musy, Stephanie; Casolaro, Pierluigi; Dellepiane, Gaia; Berger, Alfons; Braccini, S.; Purtschert, Roland

doi:10.1016/j.jenvrad.2022.106966

Cited by 5 publications

(3 citation statements)

References 47 publications

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“…The Bern cyclotron laboratory is equipped with an IBA Cyclone HC, accelerating Hions to a kinetic energy of 18 MeV with a maximum current of 150 µA 13 . In addition to the commercial radioisotope production for Positron Emission Tomography (PET), the Bern cyclotron is used for multi-disciplinary research activities, including studies of novel radioisotopes for nuclear medicine 14,15 , developments on particle accelerators and detectors 16 , studies of environmental physics 17 and radiation hardness 18,19 . These activities are possible thanks to a 6-meter long Beam Transfer Line (BTL) ending in a separate bunker with independent access to the experimental area.…”

Section: The Bern Cyclotron Laboratorymentioning

confidence: 99%

Ultra-high dose rate dosimetry with miniaturized scintillation detectors coupled to optical fibers

Casolaro

Dellepiane

Gottstein

et al. 2023

Preprint

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FLASH radiotherapy is a novel radiation delivery modality, generally considered a potential breakthrough in cancer care. With ultra-high dose rates (>40 Gy/s) delivered in fractions of a second, FLASH is characterized by unique irradiation conditions which bring along new challenges in dosimetry and beam monitoring. This article reports on the validation of innovative detection systems based on sub-millimeter-sized fast scintillation detectors coupled to optical fibers. We characterized different scintillators, namely Gadolinium Aluminium Gallium Garnet (GAGG), yttrium doped barium fluoride (Y-BaF2), and polystyrene, by studying their response to ultra-high dose rate 18 MeV proton beams. Beam tests were carried out at the Bern medical cyclotron, providing beams for multidisciplinary research activities and commercial radioisotope production, that we characterized for ultra-high dose rates irradiations. The possibility of changing the scintillator to be coupled to the optical fiber gives great flexibility to the system, by allowing to measure proton dose rates up 10.4 kGy/s and mm-small fields with high time resolution. The measurements reported in this paper were performed at a sampling rate of 20 kHz, although data acquisition up to 10 MHz is possible. The developed detection system can be successfully used to measure ultra-high dose rates and it can be further optimized to address specific and essential issues of FLASH radiation therapy, including quality assurance, real-time beam monitoring and in-vivo dosimetry.

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Section: The Bern Cyclotron Laboratorymentioning

confidence: 99%

Ultra-high dose rate dosimetry with miniaturized scintillation detectors coupled to optical fibers

Casolaro

Dellepiane

Gottstein

et al. 2023

Preprint

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“…In watersaturated media, 37 Ar can also be produced on 36 Ar dissolved in airequilibrated water (AEW). However, the reaction on 40 Ca is dominating in most cases due to the low 36 Ar abundance [ 36 Ar/Ar = 0.33 %] (Musy et al, 2022).…”

Section: Reactions With Neutrons From Different Originsmentioning

confidence: 99%

Reviewing 39ar and 37ar Underground Production in Shallow Depths with Implications for Groundwater Dating

Musy

Purtschert

2023

Preprint

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“…where, ǫ (-) is the emanation factor, which was determined by irradiation experiments (Johnson et al, 2021;Musy et al, 2022).…”

Section: Ar Productionmentioning

confidence: 99%

Explicit simulation of environmental gas tracers with integrated surface and subsurface hydrological models

et al. 2022

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Environmental gas tracers allow inferring groundwater travel times and mixing ratios. Their concentrations are commonly interpreted with simplified and indirect approaches that are conceptually at odds with the high degree of complexity found in natural systems. However, the information content of the tracers can potentially be fully explored through the explicit simulation of an advection-dispersion transport equation, for example using integrated surface-subsurface hydrological models (ISSHMs). These integrated models can be used to explicitly simulate environmental tracers in complex environments. ISSHMs are usually variably saturated flow models. However, these models do not explicitly simulate gas partitioning with the aqueous phase, restricting explicit simulation of gas tracers to fully saturated conditions or to tracers with very low solubilities. We propose a mathematical formulation for the production of environmental gas tracers that are emanated in the subsurface. The production is scaled according to gas/water partitioning and water saturation, which is already computed by the model. Therefore, ISSHMs can now be used to their full potential to explicitly simulate tracer concentrations under variably saturated and dynamic conditions. The new formulation has been successfully verified against reference simulations provided with a multi-phase flow and transport model. In addition, explicit simulation of 222Rn and 37Ar groundwater concentrations in a synthetic alluvial river-groundwater system was demonstrated, for the first time, with an ISSHM.

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Quantification of 37Ar emanation fractions from irradiated natural rock samples and field applications

Cited by 5 publications

References 47 publications

Ultra-high dose rate dosimetry with miniaturized scintillation detectors coupled to optical fibers

Ultra-high dose rate dosimetry with miniaturized scintillation detectors coupled to optical fibers

Reviewing 39ar and 37ar Underground Production in Shallow Depths with Implications for Groundwater Dating

Explicit simulation of environmental gas tracers with integrated surface and subsurface hydrological models

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