[Phys-L] Re: Survey Meters

[betwys1 at SBCGLOBAL.NET (Brian Whatcott)]

I see there is a URL for a time series for a
radon wipe at Buda, Texas  taken 2 or 3 years ago.

    <http://home.austin.rr.com/cthompson15/GM10.JPG>

And saving this jpg, converting it  to bmp format, and
  running  it by WINdig, that stalwart freebee plot digitizer
from Switzerland of 7 years ago or more ago, provides the
  data file for NLREG to fit to the following    equation:
CountsPerMinute = 15.07 + 219.7 * exp( - 2.953E-4 * t)
t in seconds.

I am  missing the obvious.
The half life of radon is 3.8 days, and this half life
  is about 40 minutes.....
Is this the radium a, b ,c, c', d route?


Brian Whatcott    Altus OK    Eureka!