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 Why Does NETC Only Use Gamma Channel 5 From EPA RADNET? 
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Stations starting with 5: on the NETC map are EPA gamma energy channel 5 (4: are the EPA beta stations) and seen on the governments RadNet site. Channel 5 of the EPA's RADNET system was selected by NETC as the energy range to use (600-800keV) mainly because everywhere else experts speak of cesium-137 as proof of (N)uclear (P)ower (P)lant fallout. Although clearly there are many other radioactive releases from these (NPP) legal dirty bombs, I understand cesium-137 is the easiest one to find in a gamma spectrum and with less chance of false positives than other isotopes. If you look below, if detected shortly after release, Iodine-131 will also be detected using channel 5. Please see graph below.

I believe Harlan/owner of NETC.com has been recording (since the creation of NETC) all the channels for every EPA gamma stations from RADNET http://www.epa.gov/radnet/

As NETC grows with paying chart members, I understand this goes towards the programming staff to improve NETC with added features and most recently an increased bandwidth plan due to all the new FREE user visiting the site daily. If you appreciate what NETC offers, please consider being a chart member. Most importantly though, consider setting up a radiation monitoring station with NETC.com Free software called "wapp4netc.exe" that runs on windows computers, because we all can not have too many stations to compare readings! I think the best we can do using all available monitoring site is try to figure out what direction the radiation comes from so if high enough, we can evacuate in a safer direction.

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http://nukeprofessional.blogspot.com/2013/11/cpm-of-gamma-in-energy-range-600-800kev.html

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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


Sun Nov 17, 2013 5:27 pm
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As NETC grows in paying customers which pays for upgrades, maybe channel 3 could be included as an available feature with data/graph to help confirm detection of cesium-137 vs. iodine-131.

nukeprofessional.blogspot.com wrote:
Partial integration of the areas under the spectral curves taking the logarithmic scale of the counts/channel into account suggests that the iodine-131 decay contributes about 91 percent of the total count rate summed over both ranges to range 3, whereas cesium-137 decay will contribute about one third to this range. Therefore, if both isotopes are present in the sample, the count rate measured in range 3 does not exclusively reflect iodine-131 decay, and iodine-131 will also contribute to the count rate measured in range 5, though to a smaller degree than cesium-137. Despite this cross-contamination, a prominent increase in range 3 suggests the presence of iodine-131 and in range 5 that of cesium-137.


http://nukeprofessional.blogspot.com/2013/11/cpm-of-gamma-in-energy-range-600-800kev.html

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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


Sun Nov 17, 2013 6:03 pm
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:!: The EPA gamma stations are using scintillation counters, not geiger counters and this is why the CPM are higher than peoples geiger counters. It is because their device is more sensitive. In fact, some geiger counters like the pancake GM tube kind (InspectorEXP like mine) get a higher CPM than other less sensitive geiger counters, all off the same radiation source.

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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


Wed Dec 11, 2013 1:56 pm
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So how can I know whether the read from EPA is acceptable or not? For normal Geiger Counter, <100 CPM is normal but EPA site shows 200 CPM in San Francisco.

KingCobra wrote:
:!: The EPA gamma stations are using scintillation counters, not geiger counters and this is why the CPM are higher than peoples geiger counters. It is because their device is more sensitive. In fact, some geiger counters like the pancake GM tube kind (InspectorEXP like mine) get a higher CPM than other less sensitive geiger counters, all off the same radiation source.


Fri Jan 10, 2014 3:00 pm
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The best way is to setup your own monitoring station and decide from your own data what is your areas normal level. The NETC Windows software is still free and it supports some geiger counters not even sold by NETC. I prefer and own the Raspberry Pi setup.

The EPA data can be so delayed (sometimes 6 hours or more) it is good to verify your stations readings with but not the most reliable way for realtime detection.

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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


Fri Jan 10, 2014 9:41 pm
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Do you have any sense of the difference between the data from personal own instrument and EPA at the same site?

KingCobra wrote:
The best way is to setup your own monitoring station and decide from your own data what is your areas normal level. The NETC Windows software is still free and it supports some geiger counters not even sold by NETC. I prefer and own the Raspberry Pi setup.

The EPA data can be so delayed (sometimes 6 hours or more) it is good to verify your stations readings with but not the most reliable way for realtime detection.


Sat Jan 11, 2014 1:05 am
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@Kevin - You can compare patterns/trends between EPA & private but not the CPM.

Here is an example using my outside station as I compare a pattern/trend seen on the EPA Seattle WA site.

Image

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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 Jan 11, 2014 2:53 am
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Great answer for this, thanks. :)


Sun Jan 12, 2014 2:48 pm
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Thanks for your reply.

Just a question - Are you in/closed to Seattle, WA? However, I see your address is in Illinois. I just wonder why you are not comparing the data from yours to the one got from EPA sites closed to your house.

KingCobra wrote:
@Kevin - You can compare patterns/trends between EPA & private but not the CPM.

Here is an example using my outside station as I compare a pattern/trend seen on the EPA Seattle WA site.

Image


Mon Jan 13, 2014 1:54 pm
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@kevinczw - You compare trends/patterns from one station to another, further away is better because it rules out local nuclear plants as the source. By comparing trends/patterns you can follow the radiation and using jetstream maps, storm radar & wind maps you can likely predict where it will go next.

_________________
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


Mon Jan 13, 2014 2:49 pm
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