and sand samples were
2012 and December
2013 from a broad spectrum of areas ranging from almost
every region in
the continental United States.
sample upon collection and/or
placed in a standardized jar, labeled, weighed, tested with an
Inspector Geiger counter and
samples were then stored for at least 3 weeks prior to testing with
a GS1100A multichannel analyizer to
determine the presence of radiation through
scintillator was calibrated with a cesium-137 NIST standardized
checksource and a cobalt-60 checksource, then
samples were tested for 8 hours each
with regular background tests performed between
December 2013 and January 2014.
to 44 different energy
levels were measured
each sample for
analysis purposes. Measurements
in the 661 keV range are listed as detections
of Cesium-137 below in orange bold
by sample region, collection date
Becquerels per kilogram including all
limits were mathematically calculated
for measurements of
that range found
statistically significant and are listed as “less than” numbers.
values serve as limits on potential presence under
conditions of uncertainty or other processes and
should be considered as non-detections.
of energy levels used to determine presence of radionuclides
other than those used for calibration, specifically
Cesium-134, were estimated
with the use of a calibration curve and reported in
yellow bold as
estimated activity of multiple statistically
significant detections. For
further information on process
and procedure see The Notebook's Notes, Sample Analysis, Equipment and again the disclaimer on our main page.
samples yielded statistically significant detections for Cesium-137.
Of those, six
yielded statistically significant detections for Cesium-134.
sample collection and testing dates with respect to the Fukushima
Diachii NPP multiple meltdowns of March 11, 2011, those detections
are strongly indicated as resulting from the same due to atmospheric