- Joined
- Mar 6, 2011
- Messages
- 279
- Points
- 28
Hey Folks,
I've just made a Geigercounter. It's the first I build.
Presently I'm reading the Metro 2033 books, so I think those inspired me .
The tube is a SI39G (got it for 15€).
Ther voltage of about 400V is created by a step up converter.
It is possible to use ist between 300v and 600V.
Thats a very simple geigercounter and I belive it only counts gamma radiation.
Some people said the tube ist sensitive for beta radiation too, but I don't think it's much.
The Circuit runs from 5V uo to 9V
I get a zero rate of about 8 or 9 counts.
I've tested the counter using a WT20 electrode. It should contain about 2% thorium dioxide. The counter clicks about 38 times with the electrode beside it.
Building it cost me about 20€ but some time too.
I realized that the most important thing is to have a fast switching time of the transistor to get such high Voltages. Actually the whole setup should be fast (fast diode after the inductance) to load up the Voltage high enough.
Cheers :beer:
so here's a short Video:
I've just made a Geigercounter. It's the first I build.
Presently I'm reading the Metro 2033 books, so I think those inspired me .
The tube is a SI39G (got it for 15€).
Ther voltage of about 400V is created by a step up converter.
It is possible to use ist between 300v and 600V.
Thats a very simple geigercounter and I belive it only counts gamma radiation.
Some people said the tube ist sensitive for beta radiation too, but I don't think it's much.
The Circuit runs from 5V uo to 9V
I get a zero rate of about 8 or 9 counts.
I've tested the counter using a WT20 electrode. It should contain about 2% thorium dioxide. The counter clicks about 38 times with the electrode beside it.
Building it cost me about 20€ but some time too.
I realized that the most important thing is to have a fast switching time of the transistor to get such high Voltages. Actually the whole setup should be fast (fast diode after the inductance) to load up the Voltage high enough.
Cheers :beer:
so here's a short Video:
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