Performance improvement of gamma ray spectrum logging tool based on LaBr3(Ce) scintillation crystals
基于 LaBr3(Ce)闪烁体的 γ 能谱测井仪性能提升研究
Hao J. Dong W. Chen N. Deng H.
July 2022Science Press
He Jishu/Nuclear Techniques
2022#45Issue 7
[Background] The main ore-bearing rock of the Husab Uranium Mine in Namibia, southern Africa, is white granite, and the radioactive element thorium content in the ore is high, which has a greater impact on the γ ray logging results. [Purpose] This study aims to solve the problem of thoriums interference on the γ ray logging results by developing a γ ray spectrum logging instrument. [Methods] A high-resolution LaBr3(Ce) scintillation detector was employed to build a new type of γ ray spectrum logging tool. Combined with cross-segment method of γ ray spectrum and techniques for separating the γ ray spectrum, the counting rates of thorium, uranium and potassium nuclides were greatly improved, so did the measuring range of the tool and logging speed. Experiment and calibration tests of this logging instrument were conducted on control holes, blast holes, national standard uranium calibration pit, etc., to verify its range, speed applicability, stability, repeatability, etc. [Results] Tests results show that the γ ray spectrum logging achieves upper limit of uranium content measurement of 5.0% eU, and the logging speed of 0.067 m·s−1, satisfying the rapid quantitative measurement of uranium grades in the blast holes of the Husab Mine and accurately estimated the amount of uranium with superior measuring accuracy to the γ ray logging method. [Conclusions] The γ ray logging tool of this study reaches specification requirements of γ ray logging. It can effectively distinguish thorium, uranium and potassium nuclides, realizing the quantitative measurement of uranium content.
Cross-segment method of γ ray spectrum , LaBr3(Ce) scintillation crystals detector , Techniques for separating the γ ray spectrum , Uranium content , γ ray spectrum logging
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China General Nuclear Power Group Uranium Resources Co., Ltd, Beijing, 100029, China
Mining Company ORTALYK Limited Liability Partnership, Shymkent, 161003, Kazakhstan
China General Nuclear Power Group Uranium Resources Co.
Mining Company ORTALYK Limited Liability Partnership
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