Scintillators with n-γ discrimination property are widely used in the measurement of neutrons. In sub MeV region, the n-γ discrimination property will be greatly deteriorated so that the neutron and γ-ray events can't be accurately discriminated. As a result, the determination of the proportions of neutron and γ-ray events beyond the discrimination threshold is important if scintillators are applied to measure the low energy neutrons. In the present work, a method based on the time-of-flight technique is proposed to calibrate the proportions of neutron and γ-ray events beyond the discrimination threshold. After the calibration, the numbers of the measured neutron and γ-ray events can be separately determined even if the neutron and γ-ray events can't be perfectly discriminated.

具有n - γ鉴别特性的闪烁体被广泛用于中子的测量中。在亚MeV区域，n - γ的判别特性将大大降低，从而无法准确地区分中子和γ射线事件。结果，如果使用闪烁体来测量低能中子，那么确定超出判别阈值的中子和γ射线事件的比例就很重要。在本文中，提出了一种基于飞行时间技术的标定中子和γ比例的方法。射线事件超出了辨别阈值。校准后，将测得的中子的数量和γ射线事件可以被单独确定，即使中子和γ射线的事件不能完全分开。