This paper describes a scintillation detecting technique with high counting rate and without fatigue. With the counting rate being about 10

5

pulses per second and the measuring time being 100 seconds or 500 seconds

the long term stability of the measuring system is 3.2×10

-4

and 1.6×10

-4

respectively. This technique has been used in the FT-1 gauge for measuring sediment concentration and so on.

In practical application from 1978 to 1982

it is proved that the scintillation system has high counting rate

high precision and high stability in performance.