Maybe in combination with a SBM-20 tube.
No, the tube does not cause any fire hazard.
I have bought a calibrated meter which I can use to calibrate my home built meter.
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The SBM 20 tube works as well. I use the SBM 19, which is more sensitive. Also have J308 and J306. These tubes are also very sensitive, but I still have to find out the factor to calculate from CPM to microsievert.
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I didn’t know about the gdk101. I might buy one to check it out.
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