posted on Mar, 19 2011 @ 06:45 PM
let me know when the counts per minute hit 3000 then i will worry.
most people have know idea how to use a Geiger Counter to check for radiation.
you can get up to 240 counts per minute just by taking your reading next to a granite counter top.
concrete walls or slabs if made with granite agragate can also read high.
you also can get very high reading from smoke detectors with some Geiger counters
all readings of background radiation should be done in the open and from the same point every time.
I use to prospect for uranium back in the 1970s.
The highest reading i ever got in a home was a old grandfather clock.
The clock face was over 1000 counts per minutes.
But it was over 3000 counts per minutes down near the base of the clock.
When we opened the grandfather clock up we found a tiny bottle of radium 226 paint for repainting the clock hands.
Other people have found the same thing in old clocks.
NCRP Report 56 indicated that the estimated average dose equivalent to the gonads of an individual wearing a radium-containing watch was approximately
3 mrem per year. The estimated dose from a watch containing 4.5 uCi of radium, a very large amount, would be 310 mrem per year to the gonads.
Even today, tritium (H-3) and promethium-147 (Pm-147) are used on instrument dials and gun sights.
both will show a high counts per minute.