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 2.GQ Geiger Muller Counter
 GMC 320E features		  New Topic  Reply to Topic
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ghenghis

United Kingdom
10 Posts
Posted - 04/05/2014 :  03:43:21  Show Profile  Reply with Quote
I have been wondering whether to buy the GMC-300E or GMC 320E models so I looked at the comparison table to see the differences. Question:

For what purpose does the GMC 320E have a temperature sensor and electronic gyroscope fitted? How does the user benefit?

Also, regarding the lifetime of the Geiger-muller detector tube, does it degrade over time (leading to ever more inaccurate counts) or does it fail suddenly at end of life?

I am new to Geiger counters so I hope the questions are not too basic for this forum.
Reply #1

ZLM

1261 Posts
Posted - 04/05/2014 :  07:53:27  Show Profile  Reply with Quote
The temperature sensor is only the extra bonus feature on GMC-320. It can be used for any temperature related testing. Some radioactives may be related to the temperature.

The electronic gyroscope is used to detect the unit movement. For now it is used to control the display rotating and backlight on/off to save the power.

Geiger tube life time is depending on number of pulses generated. Approximate lifetime is 100 million pulses.

The GMC-320 Plus is an improved model from GMC-300E series.
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Reply #2

ghenghis

United Kingdom
10 Posts
Posted - 04/06/2014 :  02:16:22  Show Profile  Reply with Quote
Thanks to ZLM for the info re extra features. Very helpful. And I think the tube lifetime of 100 Million pulses will last me several years.

But I am still curious about failure modes of the Geiger tube. How do they typically fail? I mean, would the user be immediately aware of it (sudden failure) or does the tube gradually become less sensitive?

Regards

Ghenghis
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Reply #3

ZLM

1261 Posts
Posted - 04/07/2014 :  23:58:34  Show Profile  Reply with Quote
When the tube near the end-of-life, the tube reading is starting not stable, it could be suddenly high or very low reading.
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Reply #4

ghenghis

United Kingdom
10 Posts
Posted - 04/08/2014 :  05:24:56  Show Profile  Reply with Quote
Thanks for that info ZLM.
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