GQ Electronics Technical Support Forum

GQ Electronics Technical Support Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Save Password
Forgot your Password?

 All Forums
 GQ Electronics Forums
 2.GQ Geiger Muller Counter
 High Background
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  


United Kingdom
25 Posts

Posted - 05/25/2019 :  07:48:47  Show Profile  Reply with Quote
I'm curious as to why I am reading such high background levels.
I have a new 600+ with a LND 7317 tube, Rev. is 2.07
I'm staying on the west coast of Scotland at the moment.
You can see the "72" on your map,data is open to read.
My readings seem to be 2 or 3 times higher than most others.
I checked the village and it fluctuates from 30 to 85.
Reply #1


1229 Posts

Posted - 05/25/2019 :  21:30:34  Show Profile  Reply with Quote
Different tube should have different CPM reading on same level of radiation. The LND 7317 is a high sensitive tube. The CPM reading should be 2-3 time higher than M4011 tube.

Go to Top of Page
Reply #2


United Kingdom
25 Posts

Posted - 05/30/2019 :  09:05:13  Show Profile  Reply with Quote
More observations than questions,perhaps the community wish to comment.

I still find my readings in uSv/h ,50% to 100% or more,higher than the
readings of the official EU monitoring sites ,available here -

The nearest EU reading stations are at least 50 miles away ,North,East
and South over rugged terrain.West is in the Atlantic ocean.
This area is on the edge of a relatively high Radon area,map here -

My 600+ LND 7317 also seems to be a lot more sensitive than the official
readings on the graphs at the first link,which vary little over time.
My readings vary a lot over time,as my GQ map data shows.
Are the EU official readings to be trusted ?
(Are any officials to be trusted ?)
Online,various commentators express doubt as to the accuracy of
Japanese official readings.
Perhaps the Japanese officials are wishing not to spook the herd.
GQ map readings show surprisingly low readings in Japan,although there
are few counters,and none close to Fukushima prefecture.

I understand,after reading the excellent work of stargazer 40 and ikerrg at
this amazing thread -
that this is a complex field of research,and no longer expect straight definitive
It is not even clear exactly what I am measuring.
Background indeed.
Go to Top of Page
Reply #3


642 Posts

Posted - 05/30/2019 :  12:31:50  Show Profile  Reply with Quote
We don't really know why readings from government or official readings are lower. They're usually lower in most countries compared to readings from the public.
Go to Top of Page
Reply #4


United Kingdom
25 Posts

Posted - 05/30/2019 :  13:17:24  Show Profile  Reply with Quote
As I said,don't spook the herd.
Go to Top of Page
Reply #5


388 Posts

Posted - 06/04/2019 :  01:21:14  Show Profile  Reply with Quote
given what kamilw has found, and what I have basically confirmed, here

can you take a look around your counter and check for any possible sources for interference?

Sources could be: phones, WiFi, router,radio, elevators, air conditioning, microwave ovens, workshop equipment, etc, etc!
Go to Top of Page
Reply #6


United Kingdom
25 Posts

Posted - 06/04/2019 :  10:17:15  Show Profile  Reply with Quote
Yes,I saw with interest kamilw's post.
And I have discovered under floor wiring that does have
RF spikes on it,which I can see with my EMF390.
So I have put my 600+ on the floor in a space that has no
RF according to the EMF390,and have put it on the Map just now.
First 5 minuets it looks the same,0.200 uSv/h already.
II'l leave it on for a while,lets see.

Edited by - paul on 06/04/2019 15:23:55
Go to Top of Page
Reply #7


United Kingdom
25 Posts

Posted - 06/04/2019 :  12:00:11  Show Profile  Reply with Quote
That's well over an hour and my readings are the same.
I don't think my device is reacting to stray EMF.
Its in a cold spot,no Voltage,RF,mG,nothing.
I think its working OK.
Just a sensitive tube in a slightly higher Radiation zone I guess.
Glad I bought it.

Edited by - paul on 06/04/2019 12:32:33
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
GQ Electronics Technical Support Forum © Copyright since 2011 Go To Top Of Page
Generated in 0.12 sec. Snitz Forums 2000