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[aprssig] Geiger counter mobile from Indiana to Tennessee

Robert Bruninga bruninga at usna.edu
Wed Oct 10 22:46:00 UTC 2012


> A Cheaper option is... a photodiode... and you have a
> very low-cost alpha, beta, and gamma RAD display.

But the "detector surface area is microscopic compared to the huge volume
of a geiger tube.  More like a thousand to 1?  Meaning for every ray you
detect,  you miss a thousand that do not even pass through the PN
junction?

Bob, WB4APR

-----Original Message-----
From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
Of joe jesson
Sent: Wednesday, October 10, 2012 5:47 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] Geiger counter mobile from Indiana to Tennessee


  A Cheaper option is to take a selected photodiode, or power transistor,
shield it from light, amplify, detect and display and you have a very
low-cost alpha, beta, and gamma RAD display.

Elektor has published an excellent series of articles on this and sells a
kit and I have a commercial cell/sat-based solution to sensing RAD on a
mobile asset.  APRS is a GREAT emergency backup to sensing radiation!

 I will post links if interested.  Also look at the 1,000's of RAD sensors
on the COSM network and see what the Japanese engineers have done as a
response to the nuclear disaster. What we learned from this crisis is not
to trust you government!

73,
Joe Jesson
KC2VGL





Sent via BlackBerry from T-Mobile

-----Original Message-----
From: Richard Graves <rgraves at vysystems.net>
Sender: aprssig-bounces at tapr.org
Date: Wed, 10 Oct 2012 15:47:09
To: TAPR APRS Mailing List<aprssig at tapr.org>
Reply-To: TAPR APRS Mailing List <aprssig at tapr.org>
Subject: Re: [aprssig] Geiger counter mobile from Indiana to Tennessee

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