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Solid State Geiger Sensor - After some experience, I think there is
a future here, but not yet at the hobby level / cost.<br>
<br>
Sites / projects I have checked out dont measure up to what a
pancake sensor does in the better Geiger counters today.<br>
<br>
Solid state have more noise, and temperture drift affects that
noise, thus performance.<br>
<br>
However, a cell phone camera sensor can be used as a sensor. It has
the above performance limitations, and different makes and models
are all over the map. Once advantage is each pixal is a detector,
thus it can count multiple hits at the same time.<br>
<br>
Here is a link to an app I have tested on my Epic 4g off and on for
about a year. It was useful to find a hot part in an assymble, where
a commercial Geiger was to sensitive to isolate a part out of an
assembly. It is also better than nothing, but not by much .... hi
hi Frequently temp drift and noise makes it difficult to measure
back ground levels.<br>
<br>
My phone has several APRS programs installed, and I am sure the
output of this could feed those, but I dont consider the readings to
be reliable enough to bother.<br>
<p><span style="font-family:
Verdana,Tahoma,Arial,Helvetica,Sans-serif;">----------------------------------------------------<br>
</span></p>
<p><span style="font-family:
Verdana,Tahoma,Arial,Helvetica,Sans-serif;">The REAL <b>RadioactivityCounter</b>
App is working on <b>Android and Apple iOS </b>mobile phones,
based on their internal camera sensors. NO EXTRA hardware is be
required.<a href="./html/radioactivity.html"> </a></span></p>
<p style="text-align: left;"><span style="font-family:
Verdana,Tahoma,Arial,Helvetica,Sans-serif;">This App is <b>not</b>
one of those numerous “fun apps”, but a true, really working
radiation detector. We already did measurements for certain
devices using professional equipment at the Helmholtz Research
Center Munich, the scale we used for testing starts at several
2-10 µGy/h up to 10 Gy/h (about 10Sv/h) with the latest
measurements. More infos and instructions are now available on
video. </span>Updated infos about how to cover the lenses<span
style="font-family: Verdana,Tahoma,Arial,Helvetica,Sans-serif;">.
We work on radiation measurements below 1 µSv/h. See <a
href="./html/radioa_faq.html"><b>FAQ pages</b></a> for
information on what can be measured and what is difficult or
cannot be measured. Please have a look at our <a
href="http://www.youtube.com/watch?v=qJcOq5sLxPo">video</a> on
the adjust menu, we will make this calibration procedure much
easier in the near future. <b>iPhone5 update is in work.</b></span></p>
<a class="moz-txt-link-freetext" href="http://www.hotray-info.de/index.html">http://www.hotray-info.de/index.html</a><br>
<br>
------------------------------------------------------------------------------<br>
<br>
73 from Bill - WD8ARZ<br>
<br>
<div class="moz-cite-prefix">On 10/10/2012 5:46 PM, joe jesson
wrote:<br>
</div>
<blockquote
cite="mid:1910511846-1349905566-cardhu_decombobulator_blackberry.rim.net-1796088024-@b2.c12.bise6.blackberry"
type="cite">
<pre wrap="">
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
</pre>
</blockquote>
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