Design of moderator of a compact accelerator-driven neutron source for coded source imaging

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Abstract

Coded source imaging (CSI) is a possible method to solve the contradiction between neutron flux and L/D ratio. Peking University neutron imaging facility (PKUNIFTY) is a RFQ accelerator based facility. The CSI experiments were carried out on PKUNFTY to test the benefits that this technique might bring. The CSI technique gets more restricts on the moderator, especially the neutron distribution in the inner collimator, where the coded mask sampling the source. The effect caused by the non-uniformity of neutron distribution on the mask plane was investigated. The slope type non-uniformity should less than 20% to keep the artifact in the reconstructed image insignificant. The PKUNIFTY moderator was modified according to the above limit. The preliminary experiments shown the moderator design for coded source imaging is acceptable.

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Wen, W., Wang, S., Zou, Y., Li, H., Liu, S., Tang, G., … Guo, Z. (2014). Design of moderator of a compact accelerator-driven neutron source for coded source imaging. In Physics Procedia (Vol. 60, pp. 144–150). Elsevier B.V. https://doi.org/10.1016/j.phpro.2014.11.021

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