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Below is a list of conversion factors for GM tubes that I have been collating over time. They may come in handy if you are building your own Geiger counter and want to convert from CPM (counts per minute) to μSv/h (micro sieverts per hour.) RH = values from RH Geiger SBM20 0.006315;
SBM20 0.0057; - RH
SI29BG 0.010000;
SI29BG 0.0082; - RH
SBM19 0.001500;
SBM19 0.0021; - RH
STS5 0.006666;
STS5 0.0057; - RH
SI22G 0.001714; = 583.43
SI3BG 0.631578;
SBM21 0.048000;
LND712 0.005940;
SBT9 0.010900;
SBT9 0.0117; - RH
SI1G 0.006000; SBM-20 - conversion factor 220 CPM -> 1uSv/h (working voltage-