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本文提出的使用1Ci的~(241)Am和薄铝壁X射线正比管与NIM插件组成的测量低含沙量的装置,在源距为32cm情况下,测量含沙量的误差小于±0.03kg/m~3,最小可测含沙量为0.09kg/m~3。在含沙量等于0～5kg/m~3的范围内,测量含沙量的灵敏度为±1.3％/kg/m~3(黄河泥沙)。该装置长时间稳定性良好。在计数率为1.5×10~5cps下,测量放射性强度变化系数为±0.03％/8h,重新开机读数可以重复。 使用X射线正比管低含沙量计时,采用直对式大源距的几何条件。在这种几何条件下,直接透射过去的
The proposed device for measuring low sediment concentration using ~ (241) Am with 1Ci and thin aluminum wall X-ray tube and NIM plug-in unit has less than ± 0.03 kg of sediment concentration when the source distance is 32 cm / m ~ 3, the minimum measurable sediment concentration is 0.09kg / m ~ 3. The sensitivity of sediment concentration is ± 1.3% / kg / m ~ 3 (Yellow River sediment) when the sediment concentration equals 0 ~ 5kg / m ~ 3. The device is stable for a long time. In the count rate of 1.5 × 10 ~ 5cps, the measured radioactivity coefficient of variation ± 0.03% / 8h, restart the reading can be repeated. The use of X-ray tube than the low sediment concentration, the use of straight-type geometry of the large source distance. In this geometry, the direct transmission of the past