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活化测量是等离子体焦点 (DPF)中子源的窄脉冲、高注量率中子辐射产额的有效测量方法。为提高活化探测器的测量精度 ,采用了散射中子的屏蔽措施。详细讨论了探测器的标定方法 ,用饱和照射后截止的方法 ,在加速器中子源上给出了 3个探测距离下的标定曲线和标定系数。对标定中的物理问题 ,如探测器死时间对其测量范围的影响、银的两种衰变对标定结果的影响等进行了分析。估计了主要测量误差 ,并提出了实际使用中对散射中子影响的处理方法
Activation measurement is a narrow pulse of the plasma focus (DPF) neutron source, an effective measure of high-fluence neutron radiation yield. In order to improve the measurement accuracy of the activated detector, a scattering neutron shielding measure is adopted. The calibration method of the detector is discussed in detail. The calibration curve and the calibration coefficient are given on the accelerator neutron source with three detection distances with the method of cutoff after saturated irradiation. The physical problems in calibration, such as the effect of detector dead time on the measurement range, the influence of two kinds of decay of silver on the calibration result, etc. The main measurement errors were estimated and the treatment of the effects of scattered neutrons in practical use was proposed