Dean W. Armstrong

My long suffering Geiger Counter is back up and running . I used ChatGPT to create a sample Arduino sketch to interact with the pulses comi...

There's a hot story right now about three buckets of uranium ore that was stored at a museum at the Grand Canyon, with a claim of it be...

A 39 day long sampling of every minute leads the geiger counter to a long term average of 7.72 uR/hr. That's 56658 sampling points. T...

A recent inquiry brings up the question of what's the normal natural background radiation rate in Chicago? Using the EPA's online t...

My long-suffering Geiger counter is now back up and running. http://www.lib.uchicago.edu/~dean/float.htm . Now, as has been pointed out, thi...

I've hesitated to comment much on the ongoing Japanese tragedy, but I wish to talk a little about the output coming out from the reactor...

I've been unable to get the DOS software AW-SRAD to work with the geiger counter for some time, on multiple machines, with Windows XP. ...

This circuit connected to my geiger counter uses on average 80uA-- that's 0.08mA. On a click, it will bump up to 0.1mA. On startup ju...

I've been having serial port problems with my geiger counter that has been running since December 1st, 2005, and so at the moment there...

The New York Times has a surprising article today about the radiation risks of granite counters . Granite is an intrusive rock--slowly coole...

This will probably be my last comments on the proposed New York City bill to regulate detectors, hopefully because it sounds like some peopl...

From the report of the committee on public safety : However, the emergence and commercialization of new and highly sophisticated technology ...

I'm not making this up: http://cityroom.blogs.nytimes.com/2008/01/08/a-license-to-check-for-wmds/ is reporting that New York City wants ...

I built Charles Wenzel's simple ion chamber . It creates an electric field inside the can via a battery. A wire in the center of the ...

http://www.lib.uchicago.edu/~dean/float.htm It's completely temporary, and could go down at any time, but the average radiation rate for...

Sure enough, as I suspected in my previous post , taking the potassium chloride out of the container brought the count rate up 50% to 120 mi...

A store-bought container of potassium chloride, aka Salt Substitute, contains enough of the naturally occurring potassium-40 isotope ( 0.011...

Steven conveniently graphed the data from my geiger counter, covering a week in the Ryerson Astronomical Society office. http://gateway.spc...

This was a trip to Las Vegas. Maximum altitude was at 39,000ft, and the flightpath was a relatively northern one across Nebraska and Colora...

The clicker unit attached to the geiger counter I made the clicker unit with robust design in mind. Therefore, I epoxied everything to the c...