Blinky's Lab
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Geiger Muller Tubes

Geiger Muller Tube Conversion Factors

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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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