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radhoo

Sat Feb 22 2014, 06:12PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

I'll have a look on that as well.

Meanwhile here are a few more units, newly made, and just calibrated. Should anyone be needing one, let me know.

radhoo

Wed Feb 26 2014, 08:56PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

A new uRADmonitor unit, 120000A, has become operational today, in Arad, Romania.

Before sending this unit out, it was carefully calibrated and verified against another unit. The background radiation level at my location in Timisoara, Romania where the tests were performed, was 0.11uSv/h.

(The first part of the chart corresponds to the exposure to the Thorite, as part of the calibration process, but the background radiation level can be seen to the right, where the Thorite sample was removed).
As the unit arrived at its destination, in Arad, Romania, I was surprised to see the live data shows a perceptible increase in radiation levels:

Complete details and measurements here .

Arad is only 50km to the North from Timisoara. All stations and live data can be seen here: http://www.uradmonitor.com. Thoughts on this?

Shrad

Wed Feb 26 2014, 09:08PM

Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780

wouldn't it be interesting to know if the area is over a geologic split? if so, wouldn't continuous radon emission affect background radiation while going unnoticed?

radhoo

Tue Mar 11 2014, 09:15PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

@Shrad, I'd say those would impact the measurements as well, but had little time to check that info. Before sending the units out I do the final adjustments part of the calibration process. Usually I get a figure of 0.12uSv/h here, and it's a nice surprise to discover all the naturally occurring variations at the destination. And here is another example:

The second unit running on German soil has become operational today, in Augsburg, Germany. There's a report on it on my blog at:

It currently measures an average of 0.15uSv/h, relatively higher then the other units currently in the network. Before sending it out, the calibration tests performed on the 11000008 in Timisoara gave results closer to the 0.12uSv/h figure, smaller then what it gets now. Also the Augsburg natural radiation background level seems to be higher than the one measured at only 100km to the South-East in Schechen, Germany, by the uRADMonitor station 12000008:

The 11000008 in Augsburg averages 0.15uSv/h for the last 24 hours, while the 1200008 in Schechen only reaches 0.13uSv/h . The real time data is available here.

radhoo

Tue Mar 11 2014, 10:02PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

And here are a few pics showing the 1200000A running in parallel with the expensive Gamma Scout dosimeter. The results measured by the 1200000A , currently at 0.14uSv/h, are in good concordance to the values displayed by the Gamma Scout:

This uRADMonitor unit has been calibrated in Timisoara, showing only 0.12uSV/h for the background radiation, yet at the place of destination, in Arad, it was able to measure the radiation correctly , and in good concordance with the Gamma Scout dosimeter: 0.14uSv/h

tobias

Wed Mar 12 2014, 12:45AM

Registered Member #1956 Joined: Wed Feb 04 2009, 01:22PM
Location: Jersey City
Posts: 172

Can it be mounting/positioning differences?

Shrad

Wed Mar 12 2014, 09:39AM

Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780

atmospheric pressure? I don't think so as it would vary over time
altitude? maybe
gravity? field?

radhoo

Thu Mar 20 2014, 07:10PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Unit #11000006 went online today, in Washington, USA.

Proud Mary, ready to receive your unit? The idea is I am planning to give out a free unit (including the shipping cost covered), for one of my forum colleagues that lives in the UK, and the first to come to my mind was Stella.

Chris Russell

Mon Apr 14 2014, 08:23PM

... not Russel!
Registered Member #1 Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052

Just wanted to say that I've been following this for a while, and I'm looking forward to watching it progress. Hopefully someday I'll be able to get a monitor of my own set up!

Mads Barnkob

Mon Apr 14 2014, 08:34PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Shrad wrote ...

atmospheric pressure? I don't think so as it would vary over time
altitude? maybe
gravity? field?

tobias wrote ...

Can it be mounting/positioning differences?

As in my own case, I would say as Stella suggested, soil composition and building materials may account for the difference.

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