Fig. 1. System structural diagram of daul GM counter tubes

Fig. 2. Schematic of high-voltage control circuit

Fig. 3. Schematic of measurement range control circuit

Fig. 4. Schematic of dead time regulation circuit

Fig. 5. Flow chart of designed program

Fig. 6. Schematic of range switching

Fig. 7. Photograph of dual GM counter tubes

Fig. 8. Output waveform of low range GM counter circuit

Fig. 9. Linear fitting results of measured for dual GM counter tubes Fitting plot of data without (a), and with (b) weighting data processing in the overlapping range