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OSUG - Terre Univers Environnement OSUG

Service Radioactivité

Many of the methods of environmental studies in radioactivity involve analysis of samples in a radiochemistry laboratory. Although the sample media and sample preparation vary, the basic analytical methods are used for all types of samples. Many nuclides of interest in the vicinity of nuclear facilities can be ascertained by gamma-ray spectrometry, which often requires little or no sample preparation. Radionuclides that emit only alpha or beta radiation cannot be analyzed by gamma spectroscopy. Examples of these nuclides are Pu-239 and Sr-90 alone, and many of the radionuclides in the natural series. Measurement of gross beta and gross alpha are often used to screen samples for alpha and beta emitters. If predetermined screenin