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Global Radiation monitoring system

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radhoo

Fri Nov 22 2013, 05:03PM

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

Hi Proud Mary,

it proved useful so far for quickly testing the new tubes for the more obvious defects, however I regret the way I designed it - to collect the signal from the cathode . At the time I made the board, I didn't think of the external connector, it was added later.

Back to the SI29BG, it features a rather interesting anode. I found a few pics of a dismantled tube:

I wonder if the strange anode might have anything to do with the good performance of this tube, at least when compared to the larger SBM-20.

Proud Mary

Fri Nov 22 2013, 06:29PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

radhoo wrote ...

Hi Proud Mary,

it proved useful so far for quickly testing the new tubes for the more obvious defects, however I regret the way I designed it - to collect the signal from the cathode . At the time I made the board, I didn't think of the external connector, it was added later.

Back to the SI29BG, it features a rather interesting anode. I found a few pics of a dismantled tube:

I wonder if the strange anode might have anything to do with the good performance of this tube, at least when compared to the larger SBM-20.

I remember that some Russian tubes were also designed to work in proportional mode, at a voltage slightly lower than the bend up onto the GM-region plateau - 10V - 20V less. I wonder if this could be one of these? The thicker anode would have been less susceptible to microphony and changes in C caused by the vibration or acceleration compared with a fine wire.

In normal GM use, the finer the wire, the better it is, so there must have been some reason for it, though I guess the fact that it is only supported at one end is part of the reason.

On the Russian data sheet, what is the parameter between 250V and 340V - the second line in the parameters table?

radhoo

Tue Nov 26 2013, 09:55AM

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

You are probably right about the thick anode and having support at only one end. Still, vibrations can be solved even with a smaller anode section diameter. Also that black powder looks intriguing.

wrote ...
On the Russian data sheet, what is the parameter between 250V and 340V - the second line in the parameters table?

I believe it translates as : "Initial voltage (volts)"

Proud Mary

Tue Nov 26 2013, 10:20AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

radhoo wrote ...

You are probably right about the thick anode and having support at only one end. Still, vibrations can be solved even with a smaller anode section diameter. Also that black powder looks intriguing.

wrote ...
On the Russian data sheet, what is the parameter between 250V and 340V - the second line in the parameters table?

I believe it translates as : "Initial voltage (volts)"

That's what Centronic call the 'starting voltage' - needed to estimate the output pulse amplitude.

radhoo

Mon Dec 30 2013, 10:11AM

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

I completed a variant of the Model A for SI29BG geiger tubes, that will be distributed with the one using SBM-20U tubes. Next is the uRADMonitor model B, featuring an LCD screen to also allow offline use as a dosimeter, and a battery pack, but that's going to happen in 2014. Until then, I wish you all a Happy new year!

Here are a few pics with my recent work:

More pics and details on the project's page at:

radhoo

Mon Dec 30 2013, 10:36AM

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

Two prototype stations are currently up and running:

one is in Timisoara, Romania , real time data available here.

and another one is 300km away, in Carei, Romania, the data can be viewed here (this is an uRADMonitor Model A network with a SI29BG tube).

tobias

Mon Dec 30 2013, 10:37AM

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

Radhoo, when do you plan to have these on sale and for how much $ will they go for?
Also, will it be a easy way ro interface it with other devices?

Tobias

radhoo

Fri Jan 03 2014, 08:17PM

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

Hi Tobias,

Price is not yet available, but will keep it as low as possible, as my goal is to have the global network above anything else.

What kind of interfacing do you have in mind?

Just a quick update: one of these units is on its way to Chicago, US . Will post more soon.

Mads Barnkob

Fri Jan 03 2014, 08:31PM

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

Are you planning to have a interactive world map, like write a application for google maps? To show the measurements around the world.

tobias

Sat Jan 04 2014, 10:46AM

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

I made a Nixie Clock with nRF24 transceiver. I have two temperature/humidity probes that can comunicate with it. To show the external and internal temperatures on my apt from 7 to 8AM, when it matters most.

It would be nice if I could display average and max radioactivity at night, say 9 to 10PM :)

I believe i2c, SPI or Serial would be great. You can set it Master Output only, in the case of SPI and have a stream every second containing time, max for last 24h, min last 24h, average 24h and current readings.

For the models that have no display that would also be great for troubleshooting as you can include other important info on the stream, NMEA style. One can just read it...

Tobias

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