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Determination of the optimum thickness of some moderators for fast neutrons. | ||
| Journal of Education and Science | ||
| Article 20, Volume 22, Issue 3, 2009, Pages 115-126 PDF (0 K) | ||
| DOI: 10.33899/edusj.2009.57766 | ||
| Authors | ||
| Rasheed M. Yousif; Khalid Ali Ismaeel | ||
| Abstract | ||
| Abstract The study aims to determine the optimum thickness for some moderators which are used for obtaining thermal neutrons and for wide range of neutron energy (0.03 – 15 × 106) eV. The study involves two groups of materials: the first group consisted of H2O, D2O, Be, & C), while the second one are made of hydrocarbon materials (C25H52, C6H10O5, C6H12O6, C28H48O2, C18H34O2, C5H10O2, & Tissue equivalent material). The results revealed that the best moderator in the first group was water as it has a large scattering macroscopic cross section ∑)s), absorption macroscopic cross section (∑a) and it contains a high percentage of Hydrogen and that the lowest moderator within the same group is Graphite (c) since it has a higher diffusion coefficient (D), and also has a higher diffusion length (L). In the second group, it was found the best moderator was (C25H52), and the lowest one is (C6H10O5), for the same reasons mentioned above. Besides, that a lot of physical parameters are calculated which are related to neutron diffusion in the second group materials, such as (∑a), (∑s), (D), (L), (H%), (ξ), and molecular weight (M) for the hydrocarbon compounds. | ||
| Keywords | ||
| optimum thickness; moderators; fast neutrons | ||
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