Glass Tube Shootout

I'm hoping newly manufactured tubes are better than the old ones and there's only one way to find out. I'm not sure what you've got but clearly different to what I have. The Chinese do stuff like this, produce garbage products then improve their offering in later versions. Also, if a market appears profitable new production will start. Pretty sure there is more than one factory making these things.

The Cajoe is definitely as basic as it gets for a counter but I'll try to match the outputs as best I can. Absolutely I would not be using one for quatitative analysis of some radioactive sample I have better tools for that, but for background monitoring at ~30 CPM and perhaps 2-3x that maybe it's good enough.

Interesting information. I should experiment with my J306 then.

Also got the J308-2022. Had another version of the J308 but broke it accidentaly when I made a 3D printed holder that turned out to be too tight.

 

deedee wrote:

Interesting information. I should experiment with my J306 then.

Also got the J308-2022. Had another version of the J308 but broke it accidentaly when I made a 3D printed holder that turned out to be too tight.

 

Definitely worth the effort, the more data points we have the better!

Yes. Someone who asked me to develop a 3D printed holder for the J308 sent me one for the measures. Unfortunately it broke. I got a new one and that appeared the J308_2022. The size of this tube is a little different. The holder that I designed for this tube turned out ok.

https://www.thingiverse.com/thing:5869015

I designed also holders for other tubes.

Swapped out the 2017 vintage 4011 tube (which was UV-sensitive) in my GMC-300E+ for an SBM-20. Edited the calibration settings to match. It really didn't want to start after the change and I was thinking it was broken but it was fine after I plugged the charging cable in. Think the battery was just too low.