An accurate do-it-yourself radiation meter

Martin dcmk1mr2 at
Sun Feb 12 14:35:15 CST 2012

There's an app for that:
and a FAQ:

I think there are two aspects - detector size and accuracy.  In the FAQ the
developer mentions measuring multiple bursts that might go uncounted with a
GM tube.  The high voltage supply on a GM tube needs time to recharge after
ionization and misses other events during this dead time.  The LCD would
probably have similar dead times.

Martin KB3UJQ

On Fri, Feb 10, 2012 at 6:29 PM, Bob Bruninga <bruninga at> wrote:

> What I don't get is the 2 orders of magnitude difference in capture area.
> Sure, ANY PN device can in someway be a radiation detector, but the Geiger
> tube has a hundred times more capture volume than most any PN device.
> So as far as giving an idea of background radiation, I cannot see these
> point source detectors as much more than a curiosity.  Or I am missing
> something.  I think the best detector is a LCD display with background
> plazma lighting.  Bias the lighting electrodes just below threshold and
> then
> any event anywhere in the 1/2 square foot area should be detectible?
> Subject: Re: An accurate do-it-yourself radiation meter
> >
> 78018.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news
> Or am I missing something.
> Bob, WB4APR
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