Abstract
The best way to achieve good shielding of 14 MeV neutrons is investigated. The idea is to thermalize as many neutrons as possible with a given shielding thickness. Since hydrogenous material is not efficient for thermalization of 14 MeV neutrons the neutrons are first slowed down with iron to an energy range where hydrogen is more efficient for thermalization. Layers of iron and water of various thicknesses that add up to 14 cm were investigated and it was found that a composition of 7 cm of iron and 7 cm of water gives the highest number of thermal neutrons. The fast flux leaking out of the shielding is decreased continuously with increasing iron thickness. A thin layer of water after the iron layer is enough to increase the number of thermal neutrons considerably.
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