Download PDF by Zeev Alfassi: Activation Analysis, Volume II

By Zeev Alfassi

ISBN-10: 0849345847

ISBN-13: 9780849345845

This well timed e-book covers recommended 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 drawbacks of every activation procedure. 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 resources for Activation Analysis, Volume II

Sample text

A3 = (CMR - m,, f, = (CAR - m,, - AMR - mS. SMR)/MMR . SAR)/PAR Table 4 gives the known compositions of several synthetic mixtures prepared from Mg(NO,),, AI(NO,),, SiO,, and (NH,),PO,, together with the calculated masses from the above equations with the four measurements from two activations. As can be seen, this method gives quite reliable results for the determination of sulfur and phosphorus as long as their concentration is at least one order of magnitude larger than that of aluminum. This situation is found in many natural materials, such as phosphate ores, sand, some silicates, and so on.

The same time is spent on activation as on counting of the activated sample. 84 studied the effect of the number of cycles if the transfer time is taken as zero (t, = t, = 0) by plotting Equation 20 for various cases. 5 cycles which seems meaningless. 4 T,,, is very small, indicating that we want n 2 3 and there is no loss in larger number of cycles. However, this is true only when the transfer time is zero or at least negligible. When the transfer time is comparable to the irradiationlcounting times, it brings about too many cycles, for a constant irradiation time will lead to reduction of the total counts.

As the waiting time becomes larger, the minimal time of experiment required for cyclic activation to be advantageous over the conventional one is larger. Their second plot of the signal to dbackground instead of the signal itself shows much more clearly the advantage of cyclic activation over the conventional one. They chose the half-life of the nuclides contributing to the background as lOOt,,,. The cross-over points from conventional to cyclic activation are now at times shorter by a factor of 2 compared to when only the signal was considered.

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Activation Analysis, Volume II by Zeev Alfassi


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