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中子注量测量方法常采用的金活化法,主要原因是金的纯度高,易于加工,且~(197)Au(n,γ)~(198)Au反应截面准确知道,衰变放出的γ射线易于测定。中子注量率φ的表达式为:φ=λA/(N_tσ(E)εI(1-e~(-λ_0))e~(-λ_1)(1-e~(λ_2)))式中:N_t为金片内的原子核总数;σ(E)为在中子能量为E时~(197)Au的活化截面值;λ为~(198)Au的衰变常数;A为高纯锗探测器测出的~(198)Au放出411.8 keVγ射线的全能峰面积;I为~(198)Au放出411.8 keVγ射线的强度;ε为高纯锗探测器对411.8 keVγ射线的
The gold activation method commonly used in neutron fluence measurement method is mainly due to its high purity and easy processing. Au (n, γ) ~ (198) Au cross section accurately know that the decay of γ ray Easy to measure. The expression of neutron fluence rate φ is: φ = λA / (N_tσ (E) εI (1-e ~ (-λ_0)) e ~ (-λ_1) (1-e ~ (λ_2))) N_t is the total number of nuclei in the gold plate; σ (E) is the activation cross section of ~ (197) Au when the neutron energy is E; λ is the decay constant of ~ (198) Au; The ~ (198) Au released from the (111.8 keV) γ-ray all-around peak area; I ~ (198) Au emitted 411.8 keV γ-ray intensity; ε is the high-purity germanium detector for 411.8 keV γ ray