Jeff writes,
I tried this with my CDV-700 which gives one click every five to ten seconds
as background. After wiping a 21 in monitor and a TV screen with the
tissue, I got no change. This seems pecular since I know that there are
houses within 12 mi with radon problems and mineable grade of U within 20
mi.
First let me aplogize for the higher than normal typos in that post. Two in the subject heading alone.
Not surprising that you got now reading at all with the CD-700. This meter only measures Gamma radiation, not the Alpha radiation of radon & daughters. It is also unable to measure Beta and Fast Neutrons. It is basically an ancient post-aploclypse design.
To quote from this site about the other most likely problems: http://www.dirtybombdetector.com/cdv.htm
1. Low energy response is questionable. The design for ruggedness results in solid metal detector tubes which makes for a considerable reduction in low energy detection efficiency.
2. There is significant degradation in the detector tubes in a large percentage of these instruments. It's common knowledge that there is significant tailing in the high end rate response for the GM-based instruments.
3. The units are over 40 years old - old technology and aging parts make the device unreliable.
CDV-700 instruments also saturate easily but that is not the case here.
In short, these were designed to let you know that if you got a decent reading you had about 5 minutes before getting very ill and then dying.
I still don't understand how Knuke got such a massive dose of radion in only
five sec!
It is enigmatic...and IMHO it must get back to accelerated decay... plus as the next best guess, there could be an added contribution from a hydrino interaction which perhaps is higher with radon than one might suspect and also a contribution from ozone, which is chemical not nuclear but it could have contributed.
Jones
