FAST NEUTRON TRANSMISSION MEASUREMENTS FOR REACTOR CORE AND SHIELDING MATERIALS. Final Report.

Thermal neutron transmission measurements have been made as a function of wavelength on a pyrolytic graphite monochromator crystal that has been set to diffract a horizontal beam at different take-off angles. The major dips in the transmission caused by the various reflections have been identified. These results can be used for the design of a beamline on which more than one instrument is placed. The transmission data show that it is best for the monochromator with the greatest (horizontal) take-off angle to be placed upstream, with monochromators with decreasing take-off angles progressively further downstream. The order of instruments for which the wavelength is greater than 0.43 nm is unimportant.

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Neutron transmission measurements of zinc and lead single crystals

Journal of Materials Science ◽

10.1007/bf00551912 ◽

1988 ◽

Vol 23 (12) ◽

pp. 4231-4236 ◽

Cited By ~ 4

Author(s):

M. Adib ◽

A. Abdel-Kawy ◽

Y. Abbas ◽

A. Ashry ◽

M. Wahba

Keyword(s):

Single Crystals ◽

Neutron Transmission ◽

Transmission Measurements

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Explosives detection via fast neutron transmission spectroscopy

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/j.nimb.2006.04.173 ◽

2006 ◽

Vol 251 (2) ◽

pp. 470-478 ◽

Cited By ~ 29

Author(s):

J.C. Overley ◽

M.S. Chmelik ◽

R.J. Rasmussen ◽

R.M.S. Schofield ◽

G.E. Sieger ◽

...

Keyword(s):

Fast Neutron ◽

Explosives Detection ◽

Neutron Transmission ◽

Transmission Spectroscopy

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Formation of Local, Transient “Acid Spikes” in the Fast Neutron Radiolysis of Supercritical Water at 400 °C: A Potential Source of Corrosion in Supercritical Water-Cooled Reactors?

Journal of Nuclear Engineering and Radiation Science ◽

10.1115/1.4044409 ◽

2020 ◽

Vol 6 (3) ◽

Author(s):

Md Mohsin Patwary ◽

Sunuchakan Sanguanmith ◽

Jintana Meesungnoen ◽

Jean-Paul Jay-Gerin

Keyword(s):

Fast Neutron ◽

Supercritical Water ◽

Reactor Core ◽

Radiation Chemistry ◽

Operating Conditions ◽

Monte Carlo Simulation Study ◽

Proper Understanding ◽

Gen Iv ◽

Reactor Operating

Abstract The use of supercritical water (SCW) in GEN IV reactors is a logical approach to the ongoing development of nuclear energy. A proper understanding of the radiation chemistry and reactivities of transients in a reactor core under SCW conditions is required to achieve optimal water chemistry control and safety. A Monte Carlo simulation study of the radiolysis of SCW at 400 °C by incident 2 MeV monoenergetic neutrons (taken as representative of a fast neutron flux in a reactor) was carried out as a function of water density between ∼150 and 600 kg/m3. The in situ formation of H3O+ by the generated recoil protons was shown to render the “native” track regions temporarily very acidic (pH ∼ 1). This acidity, though local and transitory (“acid spikes”), raises the question whether it may promote a corrosive environment under proposed SCW-cooled reactor operating conditions that would lead to progressive degradation of reactor components.

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