Abstract
A simple additive formula is given which, for neutron energies in the range 10-4 < E<10 eV, permits calculation of the nuclear capture, thermal diffuse and Bragg scattering cross-sections of a crystalline material as a function of its crystal constants and temperature. Computer codes PUO and SUO were developed to calculate the total attenuation of reactor neutrons through poly- and mono-crystalline samples, respectively. The codes were applied to calculate the total cross-section of polycrystalline uranium and thorium dioxides in the energy range from 4 meV to 1 eV. The obtained agreement between the calculated values and available experimental values justifies the applicability of the used formula and the computer codes. A feasibility study on using depleted polycrystalline uranium dioxide as a cold neutron filter and the single crystal as a thermal neutron filter is given. The optimum crystal parameters and thickness for efficiently transmitting the thermal reactor neutrons while strongly attenuating both fast neutrons and γ-rays accompanying the thermal ones is also given.
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Adib, M., Habib, N. On the Use of Depleted Uranium Dioxide as a Neutron Filter. Czechoslovak Journal of Physics 53, 321–333 (2003). https://doi.org/10.1023/A:1023444527084
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DOI: https://doi.org/10.1023/A:1023444527084