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 EB157607 Santa Monica, California now located outside. 
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Joined: Mon Jan 28, 2013 7:40 pm
Posts: 2732
Location: Illinois
Here is a picture of one of my basement unit, not currently online. Pictured is a Holmes HEPA air purifier with a GMC-200 connected to (not pictured) a Raspberry Pi running custom NETC software.

The particles with radiation are trapped in the HEPA filter around the geiger counter.

Sorry about the poor quality. I did a zoom first then used heavy compression to reduce the file size to save bandwidth on 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
Fri Jan 22, 2016 4:36 pm
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Joined: Wed Dec 25, 2013 1:46 pm
Posts: 17
Location: Santa Monica, California
@KingCobra, yes I agree. The filter is standard gauze. I'll add another layer or two so that air still passes through, but achieves what you describe. Thanks for checking it out. I already see a difference in the way the data graph is being rendered. I'll keep tinkering with your thoughts in mind.

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Santa Monica, California.
GMC-320 placed outside on the balcony.

http://netc.com/chart/view.php?n=1%3AEB157607


Fri Jan 22, 2016 6:35 pm
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Location: Illinois
EB157607 wrote:
@KingCobra, yes I agree. The filter is standard gauze. I'll add another layer or two so that air still passes through, but achieves what you describe. Thanks for checking it out. I already see a difference in the way the data graph is being rendered. I'll keep tinkering with your thoughts in mind.


:idea: You could also buy the largest high quality furnace filter and cut it up to use as your filter material.

_________________
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 23, 2016 12:57 pm
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Joined: Wed Dec 25, 2013 1:46 pm
Posts: 17
Location: Santa Monica, California
Oh that's a great idea. I'll post when I've installed the furnace filter.

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Santa Monica, California.
GMC-320 placed outside on the balcony.

http://netc.com/chart/view.php?n=1%3AEB157607


Sat Jan 23, 2016 7:50 pm
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Joined: Wed Dec 25, 2013 1:46 pm
Posts: 17
Location: Santa Monica, California
I was washing some towels last night. As I was cleaning out the lint trap, I realized the thick half inch of clean white fiber would be a good temporary medium to trap all kinds of particles for monitoring. I tested the fiber with my Inspector EXP and didn't pick up anything beyond the background I usually get. I fashioned a new filter and positioned it right up to the tube in the GMC-320. Seems like I did it just in time as the equipment picked up a plume of something over the last 24 hours. In these situations, it would be nice to have a scintillator to get an idea of what's being detected.

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Santa Monica, California.
GMC-320 placed outside on the balcony.

http://netc.com/chart/view.php?n=1%3AEB157607


Thu Jan 28, 2016 7:22 pm
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Joined: Wed Dec 25, 2013 1:46 pm
Posts: 17
Location: Santa Monica, California
The new tweeks seemed to work. My station is now rendering a chart that seems to match what EPA stations are picking up on. And judging from those charts, it's a bad day to be an aerobic organism... I wonder if the Jetstream http://squall.sfsu.edu/gif/jetstream_norhem_00.gif has any role in today's hot airborne particles. Maybe the radon from Porter Ranch is a part of these measurements. I wonder...

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Santa Monica, California.
GMC-320 placed outside on the balcony.

http://netc.com/chart/view.php?n=1%3AEB157607


Fri Jan 29, 2016 4:48 pm
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Joined: Fri Mar 15, 2013 1:26 am
Posts: 61
Location: Oklahoma City Area
Here is a site that I find very useful for all types of atmospheric modeling. The bottom left corner has a menu that exposes a ton of options. This link should open it up at the Jetstream model.
http://earth.nullschool.net/#current/wind/isobaric/250hPa/orthographic=-141.88,21.91,262

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MY TWO RADIATION MONITORING STATIONS IN EDMOND OKLAHOMA
Outside >> Air Filter,2nd Floor,GMC200, Indoor >> Window Sill,1st Floor,GMC300
SITE OWNERS CAN POST STATIONS HERE."User Control Panel"~"Profile"~"Edit Signature"


Fri Jan 29, 2016 5:49 pm
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Joined: Wed Dec 25, 2013 1:46 pm
Posts: 17
Location: Santa Monica, California
yes nullschool.net is amazing. thanks for the direct jetstream link

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Santa Monica, California.
GMC-320 placed outside on the balcony.

http://netc.com/chart/view.php?n=1%3AEB157607


Thu Feb 04, 2016 6:07 am
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