Neutron/$\gamma$-ray ($n∕\gamma$) discrimination is a crucial issue in neutron measurements and is usually accomplished employing detectors transparent to $\gamma$-rays (³He proportional counters), or techniques for $\gamma$ rejection (such as Pulse Shape Discrimination). The aim of this work is to test a system able to perform a quasi-digital $n∕\gamma$ discrimination without using techniques based on pulse shape analysis. The system is based on a phoswich consisting of a LiCAF:Eu crystal sensitive to neutrons and two LuAG:Ce ceramics sensitive to $\gamma$-rays. Optical filtering allows obtaining two separate acquisition channels, which selectively collect the light emitted by only one of the two scintillators. Photon induced events are then discarded through an anti-coincidence algorithm.

The results show that the proposed technique is actually capable of discarding $\gamma$-induced events, but the implemented setup downgrades the LiCAF:Eu light collection because of the light attenuation of glasses serving as filters. In some situations, it is preferable to employ the LiCAF:Eu crystal alone, discarding the $\gamma$-induced events on the basis of the signal amplitude. Therefore, the discrimination technique proposed with this setup is intended for situations in which the energy of the incoming photons or the pile-up effects related to the high fluence rate can generate pulses whose amplitude is comparable to a neutron event. In addition, it was noted that some optical filters contain impurities (¹⁰B in our case) which capture neutrons lowering the system detection efficiency.

A Monte Carlo model was also implemented to replicate the system response and predict an optimal configuration for further development.

中子/$\gamma$-射线 （$n∕\gamma$) 鉴别是中子测量中的一个关键问题，通常使用透明的探测器来完成 $\gamma$-射线（³ He正比计数器），或用于$\gamma$拒绝（例如脉冲形状鉴别）。这项工作的目的是测试一个能够执行准数字化的系统$n∕\gamma$不使用基于脉冲形状分析的技术进行区分。该系统基于一个由对中子敏感的 LiCAF:Eu 晶体和两个对中子敏感的 LuAG:Ce 陶瓷组成的 phoswich$\gamma$-射线。光学滤波允许获得两个单独的采集通道，它们选择性地收集仅由两个闪烁体之一发射的光。然后通过反重合算法丢弃光子引发的事件。

结果表明，所提出的技术实际上能够丢弃 $\gamma$- 诱发事件，但由于用作过滤器的眼镜的光衰减，实施的设置降低了 LiCAF:Eu 光收集。在某些情况下，最好单独使用 LiCAF:Eu 晶体，丢弃$\gamma$- 基于信号幅度的诱发事件。因此，此设置提出的鉴别技术适用于入射光子的能量或与高注量率相关的堆积效应可以产生幅度与中子事件相当的脉冲的情况。此外，还注意到一些滤光片含有杂质（在我们的案例中为¹⁰ B），这些杂质会捕获降低系统检测效率的中子。

还实施了蒙特卡罗模型以复制系统响应并预测进一步开发的最佳配置。