Calculation of the Yields for the Primary Species Formed from the Radiolysis of Liquid Water by Fast Neutrons at Temperatures between 25–350°C

Butarbutar, Sofia Loren; Sanguanmith, Sunuchakan; Meesungnoen, Jintana; Sunaryo, Geni Rina; Jay‐Gerin, Jean‐Paul

doi:10.1667/rr13638.1

Cited by 12 publications

(18 citation statements)

References 24 publications

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“…Recently, however, in the course of a Monte Carlo simulation study of the radiolysis of water by fast (2 MeV) neutrons (which produce high-LET recoil protons and oxygen ions) [38], our calculations showed, somewhat unexpectedly, that g(H 2 ) exhibited a downward discontinuity at ~150°C similar to that observed at low LET (Fig. 1).…”

Section: Resultssupporting

confidence: 52%

On the Temperature Dependence of the Rate Constant of the Bimolecular Reaction of Two Hydrated Electrons

et al. 2013

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Self-reaction of the hydrated electron Rate constant Yield of H 2 Linear energy transfer (LET) Monte Carlo track chemistry calculationsIt has been a longstanding issue in the radiation chemistry of water that, even though H 2 is a molecular product, its "escape" yield g(H 2 ) increases with increasing temperature. A main source of H 2 is the bimolecular reaction of two hydrated electrons (e − aq ). The temperature dependence of the rate constant of this reaction (k 1 ), measured under alkaline conditions, reveals that the rate constant drops abruptly above ~150°C. Recently, it has been suggested that this temperature dependence should be regarded as being independent of pH and used in hightemperature modeling of near-neutral water radiolysis. However, when this drop in the e − aq self-reaction rate constant is included in low (isolated spurs) and high (cylindrical tracks) linear energy transfer (LET) modeling calculations, g(H 2 ) shows a marked downward discontinuity at ~150°C which is not observed experimentally. The consequences of the presence of this discontinuity in g(H 2 ) for both low and high LET radiation are briefly discussed in this communication. It is concluded that the applicability of the sudden drop in k 1 observed at ~150°C in alkaline water to near-neutral water is questionable and that further measurements of the rate constant in pure water are highly desirable.

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Section: Resultssupporting

confidence: 52%

On the Temperature Dependence of the Rate Constant of the Bimolecular Reaction of Two Hydrated Electrons

et al. 2013

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“…In this work, principally the effects of 0.8-MeV fast neutron were predicted by calculating the yields of the first three recoil protons and by neglecting the radiation effects due to oxygen ion recoils [15,16]. We finally chose the contributions of the first three recoil protons after some tests have been conducted.…”

Section: Oh Hmentioning

confidence: 99%

“…The quantity that most significantly characterizes neutron transmission through matter is the mean-free-path (i.e., the mean distance between two successive neutron interactions). For example, the mean free path of a 0.8-MeV incident neutron in water at 25°C is ~3 cm, while the recoil proton and oxygen ion maximum ranges at this energy are in µm order [15,16]. Thus, it can be inferred that proton and oxygen ion recoils in H 2 O are widely separated from one another along the path of the neutron and their ranges are much less than the average separation between two successive neutron interactions, so there is no overlap between one and another.…”

Section: Theorymentioning

confidence: 99%

“…From those numbers, it is obvious that oxygen ion recoils give a relatively small contribution to the radiolysis, in addition to the fact that the water molecule (H 2 O) consists of two hydrogen atoms but only one oxygen atom; for those reasons, it is reasonable to simply neglect the radiation effects due to these recoil oxygen ions, or in other words, assume that neutrons are stopped by protons only [15,16].…”

Section: Theorymentioning

confidence: 99%

“…As in the previous work, the energy of a recoil proton can be calculated using the following equation [15,16]:…”

Section: Theorymentioning

confidence: 99%

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Temperature Dependence of the Primary Species Yields of Liquid Water Radiolysis by 0.8-MeV Fast Neutrons

et al. 2016

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The yields of species such as e -aq , H • , • OH, H 2 and H 2 O 2 , formed from the radiolysis of neutral liquid water by the incidence of 0.8-MeV neutrons at temperatures between 25 and 350°C, were calculated by using Monte Carlo simulations. The slowing down of these neutrons through elastic scattering produced recoil protons elastically of ~0.5057, 0.186, and 0.0684 MeV which had linear energy transfers (LETs) of ~40, 67 and 76 keV/µm, respectively, at 25°C. The effects of neutron radiation can be predicted based on the contribution of those first three recoil protons by neglecting the radiation effects due to oxygen ion recoils. Then, the fast neutron yields could be estimated by summing the yields of contributing protons after corresponding weightings were used according to their energy. In this work, yields were calculated at 10 -7 and 10 -6 s after incidence of neutron radiation in water at the aforementioned temperature range. Overall, there is a reasonably good agreement between our calculated and existing experimental G-values for the entire temperature range. However, we proposed an hypothesis that the not very significant difference between experimental data and our calculated data is due to the different measuring time used in obtaining the experimental data as compared to the ones used in our calculation. Our computed yields for 0.8-MeV fast neutron radiation show an essentially similar temperature dependences over the range of temperature studied with 2-MeV fast neutron and low-LET radiation, but with lower values for yields of free radicals and higher values for molecular yields.

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Oxidative treatment of micropollutants present in wastewater: A special emphasis on transformation products, their toxicity, detection, and field-scale investigations

Singh,

Majumder,

Saidulu

et al. 2024

Journal of Environmental Management

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Calculation of the Yields for the Primary Species Formed from the Radiolysis of Liquid Water by Fast Neutrons at Temperatures between 25–350°C

Cited by 12 publications

References 24 publications

On the Temperature Dependence of the Rate Constant of the Bimolecular Reaction of Two Hydrated Electrons

On the Temperature Dependence of the Rate Constant of the Bimolecular Reaction of Two Hydrated Electrons

Temperature Dependence of the Primary Species Yields of Liquid Water Radiolysis by 0.8-MeV Fast Neutrons

Oxidative treatment of micropollutants present in wastewater: A special emphasis on transformation products, their toxicity, detection, and field-scale investigations

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