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取两种合适的并且含量已知的不同核素作标准,即可利用(1)式求出辐照位置的谱指标(即超热中子通量(φ_α)与热中子通量(φ_t)之比)。 φ_α/φ_t=(A_2σ_(01)α_1m_1-A_1σ_(02)α_2m_2)/(A_1I_2α_2m_2-A_2I_1α_1m_1) (1) 式中:角标1、2分别表示两个标准核素;A为活化核素某个特征峰的计数率;σ_0为热中子活化截面;I为共振积分;α为θεαSD/M;θ为靶核的同位素丰度;ε为探测器效率;α为活化核特征γ射线的分支比;S
Take two kinds of different radionuclide with known content as the standard, we can use (1) to find the spectral index of the irradiation position (ie, the superheated neutron flux (φ_α) and the thermal neutron flux (φ_t )Ratio). (1) where: 1 and 2 denote two standard nuclides, respectively; A is a feature of the activated nuclide Peak count rate; σ_0 is the thermal neutron activation cross section; I is the resonance integral; α is θεαSD / M; θ is the isotope abundance of the target nucleus; ε is the detector efficiency; α is the branching ratio of γ- S