《Table 1 Fitted results of the attenuation length k and coefficient of determination R2for different

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《Neutron penetration in labyrinths under different beam losses》

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In the case of the curved labyrinth，the neutron attenuation curves for different beam losses are shown in Fig.9.It was found that the attenuation of the logarithm value of the dose rate is almost linear with distance.The neutron attenuation length k determined by fitting the results and the coefficient of determination R2for different beam losses are given in Table 1.The comparison between the calculated and the fitted results appears to be quite good.The fitted k values for different beam losses are almost consistent with the empirical formula calculation for k?0:7R1=2?1:44 m.Moreover，in case of the on-axis point source，the k is about a factor of 1.2 larger than the empirical formula estimation.Thus，in the practical design，adding a factor of 1.5 is recommended to obtain a conservative estimation of the attenuation length.