conversion
3 months 2 weeks ago #6850
by hong
conversion was created by hong
How to inquire about the conversion factors for different models of Geiger counters?
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3 months 2 weeks ago - 3 months 2 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.
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: 3 months 2 weeks ago by Simomax.
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3 months 2 weeks ago #6852
by hong
Replied by hong on topic conversion
Thank you very much for your reply
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3 months 2 weeks ago #6853
by Simomax
Replied by Simomax on topic conversion
Most welcome, and welcome to radmon.org!
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