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- • Geiger Muller Tubes
Geiger Muller Tube Conversion Factors
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- Mr Blinky
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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- 400V)
SI22G - conversion factor 792 CPM -> 1uSv/h (working voltage- 400V)
SBT-9 - conversion factor 150 CPM -> 1uSv/h (working voltage- 400V)
SI-29BG - conversion factor 122 or 112 CPM -> 1uSv/h (depending on batch) (400V)
SBT11 - conversion factor 250 or 318 CPM -> 1uSv/h (depending on batch) (390V)
SBT11A - conversion factor 250 or 318 CPM -> 1uSv/h (depending on batch)(390V)
SBT10 - conversion factor 1250 CPM -> 1uSv/h (380V)
SBT10A - conversion factor 1250 CPM -> 1uSv/h (380V)
SI8B - conversion factor 1250 CPM -> 1uSv/h (380V)
M4011 = 153.8? = 0.0065
J305b = 0.00812037037037
Archived from radmon.org - originally posted 09/01/2024
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