Monte Carlo calculations were conducted to explore the potentials of zirconium hydride (ZrH₂) as possible alternative moderator for high density polyethylene (HDPE) and water (H₂O) in a simple (100MBq) ²⁵²Cf-based Prompt Gamma Neutron Activation Analysis (PGNAA) assembly. The thickness of moderators was optimized against thermal neutron flux (ϕ_th) as well as the ratio of (thermal/fast) neutron flux (ϕ_th/ϕ_fast), calculated at the sample cavity. The capabilities of moderating ²⁵²Cf source neutrons and minimizing the γ-background due to ²⁵²⁵Cf fission γ-rays, ¹H(n_th,γ)²H γ-rays originates in the moderator as well as other (n_th,γ) capture reactions from surroundings were investigated. The optimal selected moderator with sufficient (ϕ_th) at the sample cavity and minimum γ-contamination was selected as ZrH₂ for use in a²⁵²Cf-PGNAA for detection of nitrogen and chlorine in bulk sample simulants of melamine (C₃H₆N₆) and sodium chloride (NaCl). The prompt γ-rays spectra were analyzed to detect the 10.83 MeV and 6.11 MeV prompt γ-peaks released by ¹⁴N(n_th,γ)¹⁵N and ³⁵Cl(n_th,γ)³⁶Cl, respectively. The results showed that the (²⁵²Cf-ZrH₂)-PGNAA model has positively identified nitrogen with net counts (1.25 × 10⁵ n.cm⁻².s⁻¹) and Chlorine with net counts of (4.19 × 10⁶ n.cm⁻².s⁻¹), achieving minimum detectable concentrations of about (350 ppm at 10.83 MeV) and (640 ppm at 6.11 MeV), respectively.

进行蒙特卡罗计算以探索氢化锆 (ZrH ₂ ) 作为高密度聚乙烯 (HDPE) 和水 (H ₂ O)可能的替代减速剂的潜力，在简单的 (100MBq) ²⁵² Cf 基快速伽马中子活化分析中（ PGNAA) 组装。慢化剂的厚度针对热中子通量 (ϕ _th ) 以及（热/快）中子通量之比（ϕ _th / ϕ _fast）进行了优化，在样品腔处计算。缓和²⁵² Cf 源中子和最小化²⁵²⁵ Cf 裂变 γ 射线引起的 γ 背景的能力，¹ H(n _th ,γ) ²H γ 射线起源于慢化剂以及来自周围环境的其他 (n _th , γ) 俘获反应。在样品腔中具有足够 (ϕ _th ) 和最小 γ 污染的最佳选择缓和剂被选为 ZrH ₂用于²⁵² Cf-PGNAA 中检测三聚氰胺 (C ₃ H ₆ N)散装样品模拟物中的氮和氯₆ ) 和氯化钠 (NaCl)。分析瞬发γ射线谱，检测了¹⁴ N(n _th ,γ) ¹⁵ N 和³⁵ Cl(n _th ,γ) ³⁶释放的10.83 MeV和6.11 MeV瞬发γ峰。分别为 Cl。结果表明，( ²⁵² Cf-ZrH ₂ )-PGNAA 模型对氮的净计数为 (1.25 × 10 ⁵ n.cm ^-2 .s ^-1 ) 和氯的净计数为 (4.19 × 10 ⁶ n)。 cm ^-2 .s ^-1 )，分别达到约 (350 ppm 在 10.83 MeV) 和 (640 ppm 在 6.11 MeV) 的最小可检测浓度。