During a decommissioning of nuclear facilities, rapid in-situ methods are highly desirable to support the characterization of material and sites. Mathematical efficiency calibration is suitable for in-situ measurements due to its ability to determine the efficiency for any geometry arrangement without the need to procure expensive calibration standards. During the characterization, the geometry of the measurement can change significantly, so from the dynamics and time-consumption point of view, mathematical calibration is advantageous. Paper presents the efficiency calibration of LaBr3(Ce) and NaI(Tl) detectors with MCNP6 in the range of 59.5–1332.5 keV. These detectors are widely used for in-situ measurements. The relative deviations between the calculated and measured efficiencies were analyzed. The relative deviations are up to 10% throughout the energy spectra, and up to 5% for full energy peak efficiencies. Paper provides instructions on preparation of the model of these detectors in MCNP6 for in-situ soil and concrete measurements.

在核设施退役期间，非常需要快速的现场方法来支持材料和场所的表征。数学效率校准适用于现场测量，因为它能够确定任何几何结构的效率，而无需购买昂贵的校准标准。在表征期间，测量的几何形状可能会发生显着变化，因此从动力学和时间消耗的角度来看，数学校准是有利的。论文介绍了在59.5–1332.5 keV范围内使用MCNP6的LaBr3（Ce）和NaI（Tl）检测器的效率校准。这些检测器广泛用于现场测量。分析了计算效率和测量效率之间的相对偏差。在整个能谱中，相对偏差最大为10％，对于完整的能量峰值效率，最大偏差为5％。论文提供了有关在MCNP6中为现场土壤和混凝土测量准备这些检测器的模型的说明。