By J.H. Richardson (Eds.)

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V. PETERSON TABLE 9 FLOW CHART KEY D N D/N Destructive test Nondestructive test Destructive or nondestructive depending on material or method A C E F G I M Q R S V X Y Only a small amount of material actually needed Compound analysis Elemental analysis Functional group analysis Free radical analysis Isotopic analysis Stereoisomeric analysis Sample surface must be free from contamination Suitable only for radioactive elements May introduce structural defects Valence state analysis Concentration of sample may be required Dilution or solution may be necessary Will introduce radioactivity a b c Limited to qualitative analysis Limited to quantitative analysis Limited to pure (neat) compounds EPR HEED LEED NMR PE PPM TEM UVPE Electron paramagnetic resonance High energy electron diffraction Low energy electron diffraction Nuclear magnetic resonance Photoelectron Parts per million Transmission electron microscope Ultraviolet photoelectron Ultraviolet-visible w uv/v for identifying a material.

8 X 104 2 . 8 X 10 6 α Data from Adamson (1960). 4 X X X X 10"4 10"4 10"1 101 (20 cal) 22 J. H. RICHARDSON AND R. V. 02 1/im. 001/imJ FIG. 3. Size range of participates showing selected particle sizes and the corresponding ranges of optical and electron microscopes. Colloids may be either (1) individual molecules of colloidal size or (2) aggregates of smaller molecular-weight particles that are of colloidal di­ mensions. The molecules of colloidal size have been referred to as macromolecular colloids by Jirgensons (1958) and as lyophylic colloids by Adam (1956).

Silicon semiconductor detectors with multichannel analyzers are now very commonly used for pulse-height analysis. They have better energy resolution and greater stability than proportional counters and ionization chambers, as well as a much faster recovery time, which allows high count­ ing rates. Alpha-particle survey meters, for health monitoring, are generally pro­ portional counters with large-area mylar windows. The amplified pulses are fed into a rate meter. 1 Qualitative Analysis The observation of a counting rate by means of an alpha-particle counter or a survey meter indicates the presence ot an alpha-active nuclide.

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