论文部分内容阅读
对利用γ射线透射幅度谱测管道油垢厚度响应的宽束影响进行了研究。模拟实验装置由137Cs γ射线的准直束、NaI(TI)探测器和BH1224多道谱仪组成。实验结果表明:响应与油垢厚度呈线性关系。利用光电峰区测垢,标定直线的斜率为负值;利用康普顿峰区测垢受宽束的影响,其标定直线的斜率为正值,但随管道直径增大斜率迅速减小。利用全谱测垢,对于细管道斜率为正值,对于粗管道则为负值。实测的修正因子β与1的偏差均<2％。
The effect of wide beam on the response of grease stains to the thickness of pipelines using γ-ray transmission amplitude spectroscopy was studied. The simulated experimental setup consisted of 137Cs γ-ray collimated beam, NaI (TI) detector and BH1224 multi-channel spectrometer. The experimental results show that there is a linear relationship between the response and grease thickness. The slope of the calibrated line is negative with the scaling of photoelectric peak area. The gradient of the calibrated straight line is positive with the influence of wide beam on the Compton peak, but decreases rapidly with the increase of the diameter of the pipeline. With full spectrum scale, positive values for thin pipe slopes and negative values for thick pipes. Measured correction factor β and 1 deviations were <2%.