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本文简婴总结了关于放射性同位素含沙量计的研究工作。本含沙量计的放射源为~(137)Cs γ辐射源,探测散射γ粒子,源与探测器最佳距离为45厘米,测量含沙量的精度为±0.56公斤/术~3。利用晶体管猝火电路配合G-M计数管作探头,其分辨时间可达2～3微秒,长时间稳定性良好,温度效应也很小。记录仪器采用晶体管定标电路(测量石英晶体振荡频率的精度≤1×10~(-4))。所定型的大、中含沙量计可测量15公斤/米~3以上的含沙量,野外测量精度能满足国家水文规范要求。当把~(187)Cs源改为~(241)Am低能源,可测量5公斤/米~3以上的含沙量。
This article summarizes the study of radioactive isotopes sedimentometer. The radioactive source of this sedimentometer is ~ (137) Cs γ radiation source, and the scattered γ particles are detected. The optimum distance between source and detector is 45 cm and the accuracy of sediment concentration measurement is ± 0.56 kg / h ~ 3. The use of transistor quenching circuit with G-M counter for the probe, the resolution time of up to 2 to 3 microseconds, good stability for a long time, the temperature effect is also small. Recording instruments using transistor calibration circuit (measuring quartz crystal oscillation frequency accuracy ≤ 1 × 10 ~ (-4)). The set of large and medium sediment can measure 15 kg / m ~ 3 sediment concentration, field measurement accuracy to meet the national hydrological requirements. When the source of ~ (187) Cs is changed to ~ (241) Am low energy, the sediment concentration of 5 kg / m ~ 3 can be measured.