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 2.GQ Geiger Muller Counter
 Detection of soil surface contamination
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ChrisP

Austria
3 Posts

Posted - 09/12/2019 :  13:13:50  Show Profile  Reply with Quote
Hello everyone,

we have areas here in austria that are contaminated up to 80kBq per square meter with CS 137 as a result of the chernobyl accident 1986 (in 1986 there were up to 160kBq/m2 in some spots...).

is it possible to dectect radiation at these spots with one of the GQ GMCs or is the level to low to get a significant CPM reading above backgroud ?

Greetings
Christian
Reply #1

EmfDev

921 Posts

Posted - 09/12/2019 :  15:20:11  Show Profile  Reply with Quote
It can be detected. But if it's too low, you need to use 'Timed Count' to compare with normal background.
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Reply #2

ullix

Germany
418 Posts

Posted - 09/12/2019 :  22:31:14  Show Profile  Reply with Quote
If you can't detect it - why call it "contamination"?
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Reply #3

ChrisP

Austria
3 Posts

Posted - 09/12/2019 :  23:12:20  Show Profile  Reply with Quote
Of course it can be detected using lab equipment. Authorities check the soil regularly in the affected areas. I'm just curious if it can be detected using my GMC-500+
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Reply #4

Stargazer 40

USA
347 Posts

Posted - 09/13/2019 :  04:02:15  Show Profile  Reply with Quote
80k Bq is around 2 uCi. That is coming from square meter. Testing I've done with 5 and 10 uCi point sources wouldn't really apply as they are such small amounts of material that falloff is rapid with distance. With a more even areal source I would think you'd see an increase in counts. GMC closer to ground, perhaps on the end of a wand (like a metal detector) might give good results. Just a thought.

Stargazer 40
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Reply #5

Geo-Johnny

Austria
157 Posts

Posted - 09/13/2019 :  06:48:45  Show Profile  Reply with Quote
quote:
Originally posted by Stargazer 40

GMC closer to ground, perhaps on the end of a wand (like a metal detector) might give good results. Just a thought.

Right, the best and easiest way to feel the ground is to operate the GMC on a Selfiestick for Smartphones. With the screen in large font, it is a very cheap and efficient solution to get good results. The most important thing is to use the GMC500+ in landscape mode with buttons on the right and the M4011 counter tube on the bottom.

Geiger Counters: GMC320+V5 & GMC500+
Geiger Tubes: M4011; SI-3BG; SBT-9; LND712; SBM-20
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Reply #6

Geo-Johnny

Austria
157 Posts

Posted - 09/13/2019 :  08:45:26  Show Profile  Reply with Quote
@ChrisP
You are from STMK/Deutschlandsberg/Fabrikstrasse?

Geiger Counters: GMC320+V5 & GMC500+
Geiger Tubes: M4011; SI-3BG; SBT-9; LND712; SBM-20
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Reply #7

ChrisP

Austria
3 Posts

Posted - 09/13/2019 :  10:42:45  Show Profile  Reply with Quote
Thanks for your thoughts ! Ill give it a try with my seflie stick, The gmc-500 fits very well with the holder of the stick- Great solution:)
@geo-johnny im located in Vienna. just corrected my nick in gmcmaps.. where are you from?

Greetings
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Reply #8

Geo-Johnny

Austria
157 Posts

Posted - 09/13/2019 :  11:49:00  Show Profile  Reply with Quote
@ChrisP

I am in Vienna too. Just look at the gmc world map near zentralfriedhof.

Edit: You are in Penzing, right?

Geiger Counters: GMC320+V5 & GMC500+
Geiger Tubes: M4011; SI-3BG; SBT-9; LND712; SBM-20

Edited by - Geo-Johnny on 09/13/2019 11:53:07
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Reply #9

Stargazer 40

USA
347 Posts

Posted - 09/19/2019 :  16:18:05  Show Profile  Reply with Quote
Here's my new selfie stick attached to the 500+. Took adding a little Gorilla Tape to the sides so the spring loaded clasper wouldn't slide off. Very nice and about $15 on Amazon.

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Stargazer 40
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Reply #10

Geo-Johnny

Austria
157 Posts

Posted - 09/20/2019 :  06:10:12  Show Profile  Reply with Quote
Oh my god, little Johnny from overseas had the idea with the GMC on a selfiestick and now the Americans are running it through the Grand Canyon in search of traces of Sievert and Roentgen.

Geiger Counters: GMC320+V5 & GMC500+
Geiger Tubes: M4011; SI-3BG; SBT-9; LND712; SBM-20
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Reply #11

Stargazer 40

USA
347 Posts

Posted - 09/20/2019 :  06:47:15  Show Profile  Reply with Quote
One of the best things about this forum is the ideas that spring forth. Creative bunch. Thanks 'little Johnny'.

Stargazer 40
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