The light output response and efficiency of 5”$\times$5” BC501A liquid scintillator neutron detectors composing the NAND detector array have been measured by time of flight technique using ²⁵²Cf source. Energy dependent detection efficiency was calculated using FLUKA Monte Carlo code and validated by experimental measurement. FLUKA simulation incorporated fission neutron correlation and kinematics of neutron emission from fission source determining the energy distribution of neutrons in the laboratory frame. The intrinsic features of the scintillator were studied by including particle dependent quenching and light output resolution. Comparison of FLUKA simulation of scintillation light produced by neutrons and gamma rays with measurements provided realistic results. The calculated neutron detection efficiency at $\sim$0.5 MeV threshold reproduces the experimental data reasonably well in the studied energy range, $0.5<E_n<12\mathrm{MeV}$. Neutron scattering from target chamber material in NAND was investigated using FLUKA concluding that the loss in neutron flux due to scattering from the chamber wall is $\sim$ 12%. The scattering amounts to background neutron counts in neighbouring detectors comparable to cross-talk events. The absolute efficiency of the NAND array was estimated to be $\sim$1.40% after taking into consideration the intrinsic efficiency of liquid cells, geometrical efficiency and flux loss due to scattering.

5”的光输出响应和效率$\times$组成 NAND 探测器阵列的5 英寸 BC501A 液体闪烁体中子探测器已使用²⁵² Cf 源通过飞行时间技术进行测量。使用 FLUKA Monte Carlo 代码计算能量相关检测效率，并通过实验测量进行验证。FLUKA 模拟结合了裂变中子相关性和裂变源中子发射的运动学，确定了实验室框架中中子的能量分布。通过包括依赖于粒子的猝灭和光输出分辨率来研究闪烁体的内在特征。中子和伽马射线产生的闪烁光的 FLUKA 模拟与测量结果的比较提供了真实的结果。计算出的中子探测效率在$～$0.5 MeV 阈值在研究的能量范围内相当好地再现了实验数据， $0.5<{乙}_n<12\mathrm{电动汽车}$. 使用 FLUKA 研究了来自 NAND 中靶室材料的中子散射，得出的结论是，由于室壁散射造成的中子通量损失为$～$12%。散射相当于相邻探测器中的背景中子计数，与串扰事件相当。NAND 阵列的绝对效率估计为$～$考虑到液体电池的固有效率、几何效率和散射引起的通量损失后，为 1.40%。