Low linear energy transfer radiolysis of supercritical water at 400 °C: in situ generation of ultrafast, transient, density-dependent “acid spikes”

Patwary, Mohsin; Kanike, Vanaja; Sanguanmith, Sunuchakan; Meesungnoen, Jintana; Islam, Muhammad Mainul; Jay‐Gerin, Jean‐Paul

doi:10.1039/c9cp00790c

Cited by 6 publications

(3 citation statements)

References 70 publications

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“…35 We calculated the yields (or G-values) 36 and the concentrations of radiolytically formed H 3 O + and the corresponding pH values that prevailed in these track regions immediately after irradiation as a function of time for both low and high LET, 16,25 at ambient and elevated temperatures, 37 even under supercritical conditions. 38,39 In all cases studied, an abrupt, transient acidspike response was observed around the "native" radiation tracks. This response is a very sensitive function of radiation quality (LET) and temperature.…”

Section: The Early Transitory Acidic Ph Responsementioning

confidence: 89%

Generation of ultrafast, transient, highly acidic pH spikes in the radiolysis of water at very high dose rates: relevance for FLASH radiotherapy

et al. 2022

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Monte Carlo multi-track chemistry simulations were carried out to study the effects of high dose rates on the transient yields of hydronium ions (H3O+) formed during low linear energy transfer (LET) radiolysis of both pure, deaerated and aerated liquid water at 25 °C, in the interval ~1 ps–10 μs. Our simulation model consisted of randomly irradiating water with N interactive tracks of 300-MeV incident protons (LET ~ 0.3 keV/μm), which simultaneously impact perpendicularly on the water within a circular surface. The effect of the dose rate was studied by varying N. Our calculations showed that the radiolytic formation of H3O+ causes the entire irradiated volume to temporarily become very acidic. The magnitude and duration of this abrupt “acid-spike” response depend on the value of N. It is most intense at times less than ~10–100 ns, equal to ~3.4 and 2.8 for N = 500 and 2000 (i.e., for dose rates of ~1.9 × 109 and 8.7 × 109 Gy/s, respectively). At longer times, the pH gradually increases for all N values and eventually returns to the neutral value of seven, which corresponds to the non-radiolytic, pre-irradiation concentration of H3O+. It is worth noting that these early acidic pH responses are very little dependent on the presence or absence of oxygen. Finally, given the importance of pH for many cellular functions, this study suggests that these acidic pH spikes may contribute to the normal tissue-sparing effect of FLASH radiotherapy.

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Section: The Early Transitory Acidic Ph Responsementioning

confidence: 89%

Generation of ultrafast, transient, highly acidic pH spikes in the radiolysis of water at very high dose rates: relevance for FLASH radiotherapy

et al. 2022

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“…Through the modeling work, the researchers found that during the radiolysis of uranium hexafluoride, production of uranium pentafluoride occurs and the yield is 1 * 10 −7 of the original concentration of hexafluoride. Patwary et al (2019) explored the radiolysis of supercritical water at 400 °C using low linear energy transfer based on Monte Carlo simulation. The study mentioned that, in the range of 0.15 − 0.6 g∕cm 3 , the duration and extent of the acidic pH depends on water density.…”

Section: Impact Of Radiolysismentioning

confidence: 99%

“…Patwary et al (2019) explored the radiolysis of supercritical water at 400 °C using low linear energy transfer based on Monte Carlo simulation. The study mentioned that, in the range of

0.15 ‐ 0.6 g / {cm}^{3}

, the duration and extent of the acidic pH depends on water density.…”

Section: Impact Of Radiolysismentioning

confidence: 99%

Radioactive waste: A review

Deng

Zhang

Dong

et al. 2020

Water Environment Research

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The reviewed papers presented here provide a general overview of worldwide radioactive waste-related studies conducted in 2019. The current review includes studies related to safety assessments, decommission and decontamination of nuclear facilities, fusion facilities, and transportation. Further, the review highlights radioactive wastewater decontamination, management solutions for the final disposal of low-and highlevel radioactive wastes (LLRW and HLRW), interim storage and final disposal options for spent fuel (SF), and tritiated wastes, with a focus on environmental impacts due to the mobility of radionuclides in the ecosystem, water and soil along with other research progress made in the management of radioactive waste. © 2020 Water Environment Federation • Practitioner points • The release of radionuclides and their subsequent fate and transport in the environment poses public health concern and has stimulated recent research on the waste management techniques. • Seeking a safe and environmental-friendly solution is the current trend for existing and projected inventories of radioactive waste. • Significant progress in the field of geological disposal of radioactive waste has been made in the last two decades.

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Yields of primary species in the low-linear energy transfer radiolysis of water in the temperature range of 25–700 °C

Sultana

Meesungnoen

Jay‐Gerin

2020

Phys. Chem. Chem. Phys.

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Low linear energy transfer radiolysis of supercritical water at 400 °C: in situ generation of ultrafast, transient, density-dependent “acid spikes”

Abstract: An abrupt, temporary and highly acidic pH response (“acid spikes”) is observed around the “native” radiation tracks for all considered densities immediately after irradiation.

Cited by 6 publications

References 70 publications

Generation of ultrafast, transient, highly acidic pH spikes in the radiolysis of water at very high dose rates: relevance for FLASH radiotherapy

Generation of ultrafast, transient, highly acidic pH spikes in the radiolysis of water at very high dose rates: relevance for FLASH radiotherapy

Radioactive waste: A review

Yields of primary species in the low-linear energy transfer radiolysis of water in the temperature range of 25–700 °C

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