For A FULL COPY OF THE REPORT CLICK HERE : Ketterer Hansen soils report 02Aug2019 (1)
REPORT FOR CONSULTING SERVICES
FOR HANSEN RODDENBERRY CATALYST GRANT AWARD
ACTIVITIES OF 239+240Pu AND Pu ATOM RATIOS IN HEMP STUDY SOILS
Permit and access. A permit was obtained from Jefferson County’s Transportation and
Engineering Division to access a County-controlled portion of the Indiana Street corridor.
All of the Rocky Flats Composite samples contained ample detectable 239+240Pu.
It was observed that Composite #3 exhibited the highest 239+240Pu activities. The results of all six Composites indicate a prevailing trend towards increasing 239+240Pu in the northern portion of the sampled zone. It would be of interest to collect additional composite samples along this corridor at sites north of the Composite 3 location, to investigate for the possible presence of higher activities in other locations.
The Composite samples of surface soil all indicate activities that are considerably higher than“background” levels in Colorado soils arising from global fallout and/or Nevada Test Site fallout. It is readily apparent that the Pu source is not explainable as “stratospheric fallout”. A comparison of the 240Pu/239Pu atom ratios in the samples vs. the known global fallout ratio(Kelley et al., 1999) of 0.180 ± 0.014 (2-sigma) indicates a prevalence of weapons-grade Pu, as is expected from the local Rocky Flats sources (e.g., Harley, 1980). substantially elevated activities, and the weapons-grade 240Pu/239Pu signatures, it is apparent that essentially 100% of the plutonium activity in these soils originated from Rocky
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