Properties of non-DT-neutron products in neutron tubes
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摘要: 采用两只经过标定的ST401闪烁探测器，测量了脉冲中子管的中子产额，在其中一只探测器前端增加铅板屏蔽，1 cm的铅屏蔽使探测器输出减少了18.20%，在加速器中子源上进行的类似实验表明,0.5 cm的铅使探测器的输出减少了2.90%。对两个中子源上测量的情况进行了蒙特卡罗模拟，加速器实验与模拟符合较好，脉冲中子管实验差别较大。对实验和模拟的情况进行了分析，结果表明：中子管除产生中子外，还会产生数量较多的轫致辐射X射线，这些X射线对准确测量中子管中子产额将造成不良影响。Abstract: By using two calibrated ST401 scintillation detectors, the neutron yield of a pulse neutron tube was measured, and by adding a Pb shield before one detector, the influence of the Pb shield on neutron flux was determined. The 1 cm thick Pb shield decreases the neutron flux by 18.20%. The influence of the Pb shield on accelerator neutron sources was determined the same way. The 0.5 cm thick Pb shield decreases the neutron flux by 2.90%. The measurements of two neutron sources were simulated by Monte Carlo. Compared with the neutron tube experiment, the accelerator experiment results agree with the simulation better. The theoretical analysis shows that neutron tubes can generate much bremsstrahlung X rays, which may have harmful impact on the measurement of neutron tube yields.
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