Modeling the Radiolysis of Supercritical Water by Fast Neutrons: Density Dependence of the Yields of Primary Species at 400 degree C

In this paper, Monte Carlo simulations were used to predict the G values for the primary species e super( -)aq, H., H2, .OH and H2O2 formed from the radiolysis of pure, deaerated supercritical water (H2O) by 2 MeV monoenergetic neutrons at 400 degree C as a function of water density in the range of...

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Bibliographic Details
Published in:Radiation research 2014-12, Vol.182 (6), p.695-695
Main Authors: Butarbutar, Sofia Loren, Meesungnoen, Jintana, Guzonas, David A, Stuart, Craig R, Jay-Gerin, Jean-Paul
Format: Article
Language:English
Subjects:
Computer simulation
Density
Fast neutrons
Light water
Mathematical models
Radiolysis
Reactors
Recoil protons
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Summary:In this paper, Monte Carlo simulations were used to predict the G values for the primary species e super( -)aq, H., H2, .OH and H2O2 formed from the radiolysis of pure, deaerated supercritical water (H2O) by 2 MeV monoenergetic neutrons at 400 degree C as a function of water density in the range of similar to 0.15-0.6 g/cm super( 3). The 2 MeV neutron was taken as representative of a fast neutron flux in a reactor. For light water, the moderation of these neutrons after knock-on collisions with water molecules generated mostly recoil protons of 1.264, 0.465, 0.171 and 0.063 MeV. Neglecting oxygen ion recoils and assuming that the most significant contribution to the radiolysis came from these first four recoil protons, the fast neutron yields were estimated as the sum of the G values for these protons after appropriate weightings were applied according to their energy. The reaction of H. atoms with water was found to play a critical role in the formation yields of H2 and .OH at 400 degree C.
ISSN:0033-7587
1938-5404