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 2.GQ Geiger Muller Counter
 doubts about how functioning the GMC300		  New Topic  Reply to Topic
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marone

Argentina
4 Posts
Posted - 01/28/2013 :  08:50:38  Show Profile  Reply with Quote
Hello, I purchased a GMC-300 but I have doubts about how functioning. The problem is approached the GMC-300 to a cathode ray tube (CRT) but not detect beta radiation, which could be happening? Thank you.
Reply #1

ZLM

1261 Posts
Posted - 01/29/2013 :  12:33:57  Show Profile  Reply with Quote
How do you know your CRT tube has beta ray? Most of CRT tubes do not have enough high radiation any more.
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Reply #2

marone

Argentina
4 Posts
Posted - 01/30/2013 :  04:21:17  Show Profile  Reply with Quote
CRTs can emit a small amount of X-ray radiation as a result of the electron beam's bombardment of the shadow mask/scriptperture grille and phosphors.
The amount of radiation escaping the front of the monitor is widely considered unharmful.
But also there is the problem of few electrons (compared to the amount fired by the gun) reached through the phosphor screen without colliding with it. These electrons are beta-type radiation.
Because these electrons are not detected by the GMC300? Thank you.
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Reply #3

ZLM

1261 Posts
Posted - 02/01/2013 :  09:38:06  Show Profile  Reply with Quote
If the radiation does is very low, then the cumulative measurement method should be used.

Steps:
1. Off and On the GMC-300 once. This will reset the total count to 0.
2. Turn on the data record feature (every minute) on GMC-300.
3. Switch the display to text mode and select total count ON screen.
4. Place the GMC-300 in front of CRT for at lease one hour.
5. Check the total count reading after an hour or longer.

Then do another test without CRT. compare those two readings.

You also can download the data to a computer and save the data into .Windows Excel .CSV file format for the detailed compare.
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