Activation Analysis, Volume II - download pdf or read online

By Zeev Alfassi

ISBN-10: 0849345847

ISBN-13: 9780849345845

This well timed book covers urged measurements in addition to behind schedule activation measurements utilized in chemical research of the weather. It describes a number of the probabilities of activation: neutrons, charged ions, and photons. additionally mentioned are the benefits and downsides of every activation process. those volumes are vital for these in geology, archaeology, biology, analytical chemistry, radioanalytical and nuclear chemistry, the semiconductor undefined, and others.

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Extra info for Activation Analysis, Volume II

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CYCLIC ACTIVATION Guinn suggestedg3another method similar to the cyclic activation which will use the same analysis time but will lead to a better precision of the determination than the cyclic activation analysis for short-lived isotopes; this method can be called the method of replicates. Guinng3pointed to the fact that in each cycle the main counts of the measured nuclide is due to the last irradiation, since this is the way timing parameters are determined. However, this is not true for the background radiation which has a considerably longer half-life.

5). She found that the total analysis time for 1 sample (20 replicates) was about 1 h (about 30 min weighing and 25 min analysis time). , combining n samples together) cannot be used because of problems of dead time. F. DEAD TIME AND PILE-UP CORRECTIONS In assaying very short-lived radionuclides, a high count rate is necessary to obtain good statistics during the very short counting time available. This situation poses a problem since a high counting rate causes a high dead time and many cases of pile up.

When dealing with optimization, the first question that arises is what quantity is to be optimized and what are the limitations. The answer to the limitation factors is simple, the transfer times and the total time of the analysis. We want the total time of the analysis, t, = nT, to be short enough in order to enable the measurement of a large number of samples. The important quantity to optimize is a combination between the signal and the signal-to-noise ratio. It is not only the signal-to-noise ratio which is important and should be optimized,77 since having a small signal with a very large signal-to-noise ratio still means a large statistical error in the activation analysis determination.

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Activation Analysis, Volume II by Zeev Alfassi

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