Abstract
Medical facilities utilizing neutron sources frequently select concrete as the shielding material. The evaluation of neutron shielding requirements is a complex process that requires detailed knowledge of the physical properties of shield materials, and the fluence rate and energy distribution of the source. Neutron-induced reactions must also be evaluated. Concrete has been the traditional choice for shielding neutrons and additives with large neutron capture cross sections can improve shield performance. The use of additives such as borated materials must be demonstrated with extended duration testing to ensure that the shield performs in the desired manner throughout the facility lifetime. Recent applications of micro- and nanomaterials offer the potential for improving neutron shielding materials, but their cost effectiveness and long-term reliability require verification.
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