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Iv a single sample is to be taken et a given site, the cookie
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easter is used to take out tne
sod to a depth of 2 inches and the auger
takes the remaining 2-8 inches of soil from the hole.
The soil from
ais. 20 plugs or holes is composited to make a single sample of avout$0
to 50 pounds.
If desired, the 0-2 inch sod samples for the "cookie
cutter" may be kept separate, making a sample of higher activity.
Strontium-90 found in the upper 2 inches and that found in the 2 to 8
inch depth are added to give the total for the 1.34 square feet of
surface represented in the Samples.
Carefui mixing and pulverizing of the sample is necessary to
et a representative aliquot for analysis.
Most of the strontium-90
mey be in a small fraction of the total soil taken.
Hence, care in
mixing and sus-sampiing can hardly be over-emphasized.
The key point to ramember in sampling for strontium-90 is
thet all analytical values must be accurately related to surface area
sempled.
sampling powder Gey loose singles grain soils.
eeeeees
At ths present tims we have no simple satisfactory method of
It is best to take
mn
anples when the soil has enough moisture to be coherent even if this
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equives wetting the area to bs sampled by sprinkling.
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