Information on J321 GM tube

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6 months 1 week ago #6142 by Sailpiper
I have recently acquired a Cajoe v1.1 geiger counter from AliExpress and this came with a J321 GM tube.  I have been looking for information on this tube, and in particular the conversion factor I need to use.  So far I have found very little information on this tube, only a reference that it is compatible with the M4011 tube.  Can anyone tell me what figure I put into the 'Conversion factor' settings page on the Radmon app?

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6 months 1 week ago #6146 by FSM19
Replied by FSM19 on topic Information on J321 GM tube
The J321 is virtually the same as the J305 data I have used is as follows : 
  • CPM=60, uSv=0.39
  • CPM=240, uSv=1.56
  • CPM=1000, uSv=6.5
I think these are probably close enough, fairly good agreement with an SBM20 (actually compared with several SBM20s)
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