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10 months 4 weeks ago #6850 by hong
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How to inquire about the conversion factors for different models of Geiger counters?

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10 months 4 weeks ago - 10 months 4 weeks ago #6851 by Simomax
Replied by Simomax on topic conversion
The conversion factors are relevant to the type to Geiger Muller tube used, not the actual counter. I thought there was a list on this forum somewhere, but can't find it. I may be mistaken.

Generally in the past I have simply searched the internet and looked at various pages stating conversion factors for different tubes. It should be noted that the conversion factor for a specific tube will be different dependant on the radio isotope source, so to get a general conversion factor to cover a range of radio isotopes we generally look at both extremes (high and low) and use an average. For instance the conversion factor an SBM-20 tube would be different for Cs-137 (Caesium 137) and Co-60 (Cobalt 60), so we look at the highest number and the lowest number and take an average.

Below is a list I have been collating for some time now.
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
Last edit: 10 months 4 weeks ago by Simomax.

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10 months 4 weeks ago #6852 by hong
Replied by hong on topic conversion
Thank you very much for your reply

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10 months 4 weeks ago #6853 by Simomax
Replied by Simomax on topic conversion
Most welcome, and welcome to radmon.org!

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