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本文对用铅减弱法测 k_u 的历史情况作了简短回顾,并介绍了处理铅减弱法实验数据的方法。在由 Sames 静电加速器上 T(d,n)~4He 反应产生的(n,γ)混合场中,用铅减弱法对自己设计制作的平行板流气电离室(TE-TE,Mg-Ar 和 Al-Ar)作了测量。由计算给出了组织等效电离室的 k_T值,且确定出:k_U(Mg-Ar)=0.193±0.010及 k_U(Al-Ar)=0.160+0.011。同时,对窄束、宽束(n,γ)混合场相应的中子、γ组分的吸收剂量作了测定。
In this paper, a brief review of the history of k_u by the lead-abatement method is presented, and the experimental data of the lead-abatement method is introduced. In the (n, γ) mixed field generated by T (d, n) ~ 4He reaction on the Sames electrostatic accelerator, the parallel plate flow ionization chamber (TE-TE, Mg-Ar and Al -Ar) was measured. The k_T value of the tissue equivalent ionization chamber is given by calculation and it is determined that: k_U (Mg-Ar) = 0.193 ± 0.010 and k_U (Al-Ar) = 0.160 + 0.011. At the same time, the absorbed dose of γ component of the neutron corresponding to the narrow-beam, wide-beam (n, γ) mixed field was measured.