The Cs₂LiYCl₆ (CLYC) scintillator is proven to be suitable for dual $\gamma$-ray/neutron detection owing to its distinct response to both radiation types. This feature makes this material attractive for applications in nuclear security and safeguards. Two 3.8 cm diameter CLYC crystals, one enriched with 95% ⁶Li, and the second one depleted of ⁶Li and with $>$99% ⁷Li, were characterized with conventional gamma-ray sources as well as with ($\alpha$, n) and a bare and heavy-water-moderated ²⁵²Cf neutron source. The suitability of the two scintillators for detection and characterization of special fissionable materials was evaluated experimentally using uranium and plutonium samples with different isotopic concentrations. Whereas the two detectors have comparable performances for gamma rays, ⁶Li-enriched CLYC shows better response for neutron gross count, because of its sensitivity to thermal neutrons. A simple method based on neutron/gamma ratios within certain energy regions has been demonstrated to be able to distinguish between different neutron emitting sources, showing very promising results for the development of more sophisticated identification algorithms based on neutron/gamma signatures. The results reported here suggest the ⁶Li-enriched one as a better candidate for nuclear security applications.

Cs ₂ LiYCl ₆ (CLYC) 闪烁体已被证明适用于双$\gamma$-射线/中子探测，因为它对两种辐射类型都有不同的响应。这一特性使这种材料对核安全和保障方面的应用具有吸引力。两颗 3.8 cm 直径的 CLYC 晶体，一颗富含 95% ⁶ Li，第二颗缺乏⁶ Li 并含有$>$99% ⁷ Li，用传统的伽马射线源以及（$\alpha$, n) 和一个裸露和重水慢化的²⁵² Cf 中子源。使用具有不同同位素浓度的铀和钚样品，通过实验评估了两种闪烁体对特殊可裂变材料的检测和表征的适用性。虽然这两种探测器对伽马射线的性能相当，但⁶富锂 CLYC 对中子总计数显示出更好的响应，因为它对热中子敏感。一种基于某些能量区域内中子/伽马比率的简单方法已被证明能够区分不同的中子发射源，显示出非常有希望的结果，用于开发基于中子/伽马特征的更复杂的识别算法。这里报告的结果表明，富含⁶ Li 的一种是核安全应用的更好候选者。