Hello and Thank You for this very nice project. I have built my DIY uRADMonitor KIT1 and i’m wondering what is the conversion factor for tube SI-16BG. I did not found any information in internet, only few details.
I did some calculations, but i’m not sure, so please help me to understand.

Radiation determine: beta ( > 0.25 MeV) ; gamma soft/hard
Voltage of start of counting: 280 – 330 V ;
Operating voltage (recommended): 360 – 440 V;
Length of flat part of counting curve (plateau): 80 V
Slope of the counting curve: < 0.12 %/V;
Natural background: < 0.4 counts/s;
Maximum radiation: 1*10E5 counts/min;
Load resistance: > 8 MOhm
Allowable stray input capacitance: 10 pF
Working temperature range: -50…+70 C

Best Regards, LZ1JER, Bulgaria