By Zeev Alfassi

ISBN-10: 0849345847

ISBN-13: 9780849345845

This well timed e-book covers advised measurements in addition to not on time activation measurements utilized in chemical research of the weather. It describes some of the probabilities of activation: neutrons, charged ions, and photons. additionally mentioned are the benefits and drawbacks of every activation technique. those volumes are very important 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

Sample text

In pottery, they determined A1 from 27Mg, due to the low concentration of Mg, and after subtracting the contribution to '*A1 from Al, they calculated from 28A1the concentration of Si, since the concentration of P in pottery is very low. "' studied the concentration of silicon in plants by the 2ySi(n,p) 2yA1reaction. Although its peak at 1273 was resolved from 28A1single escape peak at 1268 keV, the resolution is bad enough and the error in the counts due to 29Alis quite high, so they preferred to take the counts due to the doublet (1268 1273) and to substract the counts of the single escape peak as calculated from the 1779-keV photopeak of 2XA1and the ratio single escapelphotopeak measured in irradiated pure aluminum sample.

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.

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. During each counting period, the activity of the sample changes considerably due to the decay of the short-lived products. Besides, the background due to the longer-lived activation products is building up cycle by cycle and hence the background differs from one cycle to another.

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Activation Analysis, Volume II by Zeev Alfassi


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