 Nuke the fridge?
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Conundrum
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Sat Jul 28 2018, 02:56PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
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Hi all.
Have been trying to find out how to measure the background rate on some old SBM-20 tubes.
Would a domestic fridge (obviously turned off) or freezer be a good method if I suspended the tube on very thin copper wires and connected the HV driver via resistor + TOSLINK LED and fibre optic cable then over a day or so measured pulses per second (ie Bq) and compare with accepted parameters for the tubes at known temperature?
I did also think about using an avalanche photodiode on the + side with a lens so that any red flashes from ionization events
can be counted twice. This might be a good way to prevent false counts but if done right would also remove unwanted voltage from the cheaper inverters which output between 550 and 600V, LED is known to work in this mode as already tested.
You can still get the three wire variety new from CPC apparently.
The diodes here are AD500-8 160V approx threshold voltage.
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