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Bert490 wrote:
Hi Anan7 and welcome to Netc. About the Scintillation detectors used for the EPA gamma sites, just read the topic 'are you guys up?' in this very forum. KC posted a link to a great video showing the differences.


Thank you Bert490, the severe thunderstorm has passed now.

Anan7 here is the link to the video Bert490 previously mentioned: https://www.youtube.com/watch?v=5x6rnNgRBNg

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Thu Jul 21, 2016 11:53 pm
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thanx bert and king but that vid, that's nuts! - it just blows the wheels off the idea of thresholds of radioactive activity that should be cause for alarm or action because, as is so clearly demonstrated in the vid the better the detector the greater the readings making you wonder what real background levels should be/is. I suspected that my gmc3u00e was not the most sensitive device but this vid makes me think that I should save up for something better.


Fri Jul 22, 2016 11:58 pm
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Anan7 wrote:
thanx bert and king but that vid, that's nuts! - it just blows the wheels off the idea of thresholds of radioactive activity that should be cause for alarm or action because, as is so clearly demonstrated in the vid the better the detector the greater the readings making you wonder what real background levels should be/is. I suspected that my gmc3u00e was not the most sensitive device but this vid makes me think that I should save up for something better.


I own the InspectorEXP just like you seen in the video. I also own the Mazur9000 which uses the same GM tube as the InspectorEXP. I own many GMC-200 units, a GMC-300 and a GMC-300+ unit. My outside radiation monitoring station uses the GMC-200 because of durability and it on the face of a HEPA filter to increase the sensitivity.

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MY OUTSIDE RADIATION MONITORING STATION:
South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West.
http://netc.com/chart/view.php?n=1%3AEB5A139C


Sat Jul 23, 2016 2:34 pm
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@Anan7 - I suggest you consider using a HEPA purifier like me to increase you GMC-300 units sensitivity. Radiation often travels with moisture/water and dirt/dust. By using a HEPA filter you collect the radiation in the filter and as it builds up, your GMC-300 will more easily detect it.

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MY OUTSIDE RADIATION MONITORING STATION:
South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West.
http://netc.com/chart/view.php?n=1%3AEB5A139C


Sat Jul 23, 2016 2:39 pm
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Joined: Fri Jul 03, 2015 7:04 pm
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Location: Toronto Canada
Anan7 wrote:
... activity that should be cause for alarm or action because, as is so clearly demonstrated in the vid the better the detector the greater the readings making you wonder what real background levels should be/is. ...makes me think that I should save up for something better.

True, but there are many of us happy with the less sensitive detectors, knowing that they do detect gamma and beta, especially the nastiest nuclides. The biggest misconception is comparing or adding scintillation and GM tubes readings together (e.g. the VT writer). But as you saw from the video, even GM tubes are different from each other. This is the reason why real-time detection map sites fall into 2 camps. Controlled and pre-qualified hardware makes the CPM values comparable, and level thresholds are valid and the same everywhere. Examples are Safecast.org, uRADmonitor.com, Radioactiveathome.org and Blackcatsystems.com. Sites that leave hardware options open to the contributor include this site (that uses self-compared historical data from each site separately), Radmon.org (using user-selected thresholds that are visible to everyone, and more hardware options), and Radiationnetwork.com. The first 2 of these offer free software and have an active user form, and this combination is likely one reason why both seem more able to attract new users. Note that gmcmap.com also has real-time data from their pre-qualified detectors, but it is unclear how much it can be trusted as much of it is old data lingering on the map, and also no history graphs.

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Sun Jul 24, 2016 7:42 pm
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@Bert490 - Until you mentioned Blackcatsystems.com I had forgot that I was a member/customer with them long ago. I still own their GM-45 model geiger counter that uses a pancake GM tube like my InspectorEXP and Mazur 9000. In fact, the Blackcatsystems.com air sampler kit for their GM-45 does just what my HEPA air purifier radiation station does but not as well as my outside HEPA system. http://www.blackcatsystems.com/GM/acc4.html

The bottom line in understanding the data from any of these networks or geiger counters is simple.

1. Know about radiation types (alpha, beta, gamma & x-ray) and how they work.
2. Know about different GM tubes and what their sensitivity is, normal background ranges are.
3. Know what GM tube is being used, inside or outside, air filter/sampler or not.

There is also the factor of trust in the station operator. I was once an active member of Radiation Network before NETC launched. I witnessed many station alerts that were false alarms for many different reasons. If you do not trust the station operator or can't communicate with them, obviously you can't trust their data. I believe NETC is more advanced or I wouldn't be here giving my time away.

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MY OUTSIDE RADIATION MONITORING STATION:
South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West.
http://netc.com/chart/view.php?n=1%3AEB5A139C


Tue Jul 26, 2016 7:58 am
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:idea: I highly recommend to anyone who wants to learn about radiation go visit this section (NUCLEAR 101) of the forum.

https://www.netc.com/bb/viewforum.php?f=7

As I find things that I believe will help educate people on the topic of radiation, I add it to that section of the forum.

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MY OUTSIDE RADIATION MONITORING STATION:
South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West.
http://netc.com/chart/view.php?n=1%3AEB5A139C


Tue Jul 26, 2016 8:16 am
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Another reason I believe that everyone with a monitoring station (inside or out) should use a HEPA filtering system is so when an event happens, you have physical proof. History shows us that when nuclear accidents happen, officials deny it. Having a HEPA air purifier filter makes for good evidence. It collects radiation samples for future testing with better equipment than the geiger counter. Think of the geiger counter as nothing more than an early warning detection system.

Here is a short video clip of a nuclear expert which confirms what I just said:

https://youtu.be/x-3Kf4JakWI?t=362

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MY OUTSIDE RADIATION MONITORING STATION:
South Beloit, Illinois - GMC200 Outside on HEPA air purifier, ground level, facing West.
http://netc.com/chart/view.php?n=1%3AEB5A139C


Tue Jul 26, 2016 9:47 am
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