ABSTRACT

A new promising nuclear technique to determine the coal-ash content was investigated using a bismuth germinate (BGO) detector instead of a sodium iodide-thallium [NaI(Tl)] detector for the dual-energy gamma-ray transmission (DEGT) measurements at 59.6 and 661.7 keV. The peak detection efficiency of the high-energy gamma-ray radiation was about two- to three-fold higher when using a BGO than a NaI(Tl) detector. This would increase the potential operation safety by allowing the use of a lower radioactivity level or a shorter measurement time. To analyze the coal-ash content using DEGT, the relationship between the transmittance ratios and the coal-ash content was successfully achieved as a linear equation, while the coal-ash contents determined by DEGT were in a very good agreement with those determined by X-ray fluorescence spectroscopy and standard chemical ASTM3174 methods, showing a highly linear relationship. In brief, the DEGT at 59.6 and 661.7 keV using a BGO detector could be developed to be a new promising approach to determine the coal-ash content as a real-time and on-belt analysis or a portable device in further investigation.

摘要

使用锗酸铋 (BGO) 探测器代替碘化钠 - 铊 [NaI(Tl)] 探测器进行双能伽马射线透射 (DEGT) 测量，研究了一种新的有前途的核技术来确定煤灰含量。 59.6 和 661.7 keV。当使用 BGO 时，高能伽马射线辐射的峰值检测效率比 NaI(Tl) 检测器高约 2 到 3 倍。这将通过允许使用较低的放射性水平或较短的测量时间来增加潜在的操作安全性。为了使用 DEGT 分析煤灰含量，透射率与煤灰含量之间的关系成功地实现为线性方程，而 DEGT 测定的煤灰含量与 X 射线荧光光谱法和标准化学 ASTM3174 方法测定的煤灰含量具有很好的一致性，呈高度线性关系。简而言之，使用 BGO 检测器的 59.6 和 661.7 keV 的 DEGT 可以被开发为一种新的有前途的方法来确定煤灰含量，作为实时和带上分析或进一步研究的便携式设备。