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文章介绍了研究截面扫描基础理论的四个基本实验,它们是:1.不同记录速度时截面扫描曲线的比较,2.预置脉冲数对峰值的影响,3.放射源所在深度位置对峰值的影响,4.放射源强度不同时对峰值的影响。四个实验都利用了放射性点源以模拟要探测的放射性物质。使用的备有裂隙准直器的探头——计数率仪——记录仪系统是Siemens Scintimat 2G扫描机。 Ba—133放射性点源6只的相对强度在1±0.06范围之内(名义强度为10μCi),按实验要求设计了适宜的放射源排列形式。实验一结果认为最慢纸速(Ⅰ档)时曲线已足够清晰。实验二指出预置脉冲数与峰值成反比。实验三证明应以峰值大为好,实用时
The paper introduces four basic experiments on the basic theory of cross-section scanning. They are: 1. Comparison of cross-section scan curves at different recording velocities, 2. Effect of preset pulse number on the peak, 3. Effect of the depth position on the peak Affect, 4. The impact of different sources of radiation intensity on the peak. All four experiments utilized radioactive point sources to simulate the radioactive material to be detected. The probe used with the slit collimator - Counting meter - The recorder system is a Siemens Scintimat 2G scanner. The relative intensities of 6 Ba-133 radioactive point sources were within the range of 1 ± 0.06 (nominal strength was 10μCi). The proper arrangement of radioactive sources was designed according to the experimental requirements. The results of the first experiment that the slowest paper speed (Ⅰ file) when the curve is clear enough. Experiment 2 indicates that the preset pulse number is inversely proportional to the peak value. Experiment 3 proved that the peak should be good, when practical