College of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China; Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology, East China University of Technology, Nanchang, 330013, China; State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, China.
College of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China.
Appl Radiat Isot. 2021 Feb;168:109488. doi: 10.1016/j.apradiso.2020.109488. Epub 2020 Nov 20.
In our previous research, a new detection method was proposed to measure Hg and Pb simultaneously by combining Prompt Gamma-ray Neutron Activation Analysis (PGNAA) and X-ray Fluorescence (XRF) and proved by the Monte Carlo N-Particle (MCNP) simulation code. For further experimental verification, a combined measurement experimental facility, comprising an Am-Be neutron source, SAINT-GOBAIN Bismuth Germanate (BGO) as the γ-ray detector, and an NaI detector with 25 μm Be window as the X-ray detector, was presented. Specifically, the characteristic X-ray fluorescence of the Hg directly induced in this experimental facility was utilized to improve the limits of detection (LOD) of Hg instead of traditional excitation sources. The simulation and experiment results indicated that LOD for Hg by the combined measurement instrument was 19.4 mg kg. The empirical formula of the calibration curve in this method was given based on the aforementioned calculations.
在我们之前的研究中，提出了一种新的检测方法，通过结合瞬发伽马中子活化分析（PGNAA）和 X 射线荧光（XRF）来同时测量汞和铅，并通过蒙特卡罗 N-粒子（MCNP）模拟代码进行了验证。为了进一步进行实验验证，提出了一种组合测量实验设备，该设备包括 Am-Be 中子源、圣戈班铋锗酸盐（BGO）作为γ射线探测器，以及带有 25 μm Be 窗口的 NaI 探测器作为 X 射线探测器。具体来说，利用该实验设备中直接诱导的 Hg 的特征 X 射线荧光来提高 Hg 的检测限（LOD），而不是传统的激发源。模拟和实验结果表明，组合测量仪器对 Hg 的 LOD 为 19.4mgkg。根据上述计算给出了该方法中校准曲线的经验公式。
