In this study, 3″ × 3″ NaI(Tl) detector, which is widely used in gamma spectroscopy, was modeled with FLUKA code, and calculations required to determine the detector's energy resolution were reported. Photon beams with isotropic distribution with 59, 81, 302, 356, 511, 662, 835, 1173, 1275, and 1332 keV energy were used as radiation sources. The photon pulse height distribution of the NaI(Tl) without influence of its energy resolution obtained with FLUKA code has been converted into a real NaI(Tl) response function, using the necessary conversion process. The photon pulse height distribution simulated in the conversion process was analyzed using the ROOT data analysis framework. The statistical errors of the simulated data were found in the range of 0.2–1.1%. When the results, obtained with FLUKA and ROOT, are compared with the literature data, it is seen that the results are in good agreement with them. Thus, the applicability of this procedure has been demonstrated for the other energy values mentioned.

在这项研究中，广泛用于伽马光谱的 3" × 3" NaI(Tl) 探测器用 FLUKA 代码建模，并报告了确定探测器能量分辨率所需的计算。使用具有 59、81、302、356、511、662、835、1173、1275 和 1332 keV 能量的各向同性分布的光子束作为辐射源。使用 FLUKA 代码获得的不受其能量分辨率影响的 NaI(Tl) 的光子脉冲高度分布已使用必要的转换过程转换为真实的 NaI(Tl) 响应函数。使用ROOT数据分析框架分析转换过程中模拟的光子脉冲高度分布。模拟数据的统计误差在 0.2-1.1% 的范围内。当用 FLUKA 和 ROOT 获得的结果与文献数据进行比较时，可以看出，结果与他们非常吻合。因此，该程序的适用性已被证明适用于提到的其他能量值。