I did try putting the SB-20 on top of a bunch of tubes (a bunch = 3 in this case). It briefly got up to around 120CPM, but mostly hovered around 50-70CPM. I'm not sure what background is at my place. Anything between 15 and 35 CPM maybe. So maybe it registered something, or it could be statistically background. I would have to make a ton more measurements (a ton >> 3) to figure out how this meter behaves and then another ton to see if it was actually measuring anything more with the tubes.
I am mulling over building a case for this meter, but I can't decide how to do it whilst a) not blocking alpha particles and b) not exposing the 450v or so (although we are talking micro amps here). I guess an opening that doesn't expose the terminals would do. That has given me an idea. I could shield the SBM-20 from all but one direction and then try with the 5092A's again, maybe there will be a more significant difference. What kind of shielding might be necessary? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/820985e5-fc93-401c-b55c-4c516d62e871%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
