: 5 n Iv a single sample is to be taken et a given site, the cookie {D 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 & SN a equives wetting the area to bs sampled by sprinkling. a & vgnt. i .< . smee uy , a a” "> SAS A gt ee ~ a aSy a Be ~ ™ “eaAL - . ~s