采用双台或多台FD—105仪器进行水氡测量,是提高观测质量的有效办法。这样做有两个明显的作用,第一,提高观测数据精度,减小误差,误差σ=s/N~(1/2),增加观测台数N,σ减小。通过计算,双台比测误差是单台的0.7071倍,而三台是0.5774倍,几乎只有原误差的二分之一。第二,及时发现其中某台仪器测值缓慢偏移的故障,排除假异常。 Using two or more FD-105 instruments for radon measurement is an effective way to improve the quality of observations. There are two obvious roles in doing this. First, to improve the accuracy and reduce the error of the observed data, the error σ = s / N ~ (1/2) increases the number of observation stations N and σ decreases. Through calculation, the error rate of dual station measurement is 0.7071 times of a single station, while that of three stations is 0.5774 times, almost only half of the original error. Second, the timely detection of one of the instruments measured values ​​slowly offset fault, eliminate false anomalies.