7 SAMPLING AND PREPARATION FOR LABORATORY …

7 SAMPLING AND PREPARATION FOR. LABORATORY MEASUREMENTS. Introduction There are three methods for collecting radiation data while performing a survey. A direct measurement is obtained by placing the detector near or against the surface or in the media being surveyed and reading the radioactivity level directly. Scanning is an evaluation technique performed by moving a portable radiation detection instrument at a constant speed and distance above the surface to semi-quantitatively detect elevated areas of radiation. These measurement techniques are discussed in chapter 6. SAMPLING is the process of collecting a portion of an environmental medium as representative of the locally remaining medium. The collected portion of the medium is then analyzed to determine the radionuclide concentration. This chapter discusses issues involved in collecting and preparing samples in the field for analysis, and in evaluating the results of these analyses.

standard operating procedures (SOPs) to be followed or developed (Chapter 7)! analytical bias and precision (e.g., quantitative or qualitative) (Appendix N)! target detection limits for each radionuclide of interest (Section 6.4 and Table 7.2)! cost of the methods being evaluated (cost per analysis as well as total cost) (Appendix H)

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