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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
With such a small tube, those thing wouldn't be useful for much of anything. Although they do detect the presence of rays.
That looks like pretty thick metal, and the only rays that would get through that are gamma and superhighenery beta and or x radiation. Geiger tubes have horrible sensitivity to gamma, even more so with such a tiny tube. Those clicks from the watch hands sound like the background radiation at my house on my counter.
/end rant
I do love the sound though. I must have one of those speakers. My counter only has a non-amplified peizo, which isn't too loud.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Nicko, this tube is typical of those designed for radiation workers' personal dosimetry.
Such tubes are characterized by very short dead time - usually about 15 microseconds - to make high count rates possible without pulse pile-up - but otherwise to conduct as infrequently as possible to conserve battery life. As an informed guess, I'd say that your tube probably had an operational range of 10E-1 - 1 x 10E4 mGy/hr and a shielded background of a few counts per minute i.e. where the detector is detecting Pb-210 and Po-210 in its own soldered joints. (An unusual plus point for Pb-free solder! ) and a very small angle plateau slope to keep the tube in the GM region as long as possible in the face of declining battery voltage.
At the risk of stating the obvious, this GM 'counter' has no facilities for counting.
For the amateur scientist, largely confined to the radioactivity of the natural world, this tube and the contraption to which it is attached would have very little to offer.
If it were food, I'd suggest cutting out the middle man, and flushing it straight down the toilet,
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Little GM kit from EG...
) and a very small angle plateau slope to keep the tube in the GM region as long as possible in the face of declining battery voltage.