Read e-book online Activation Analysis, Volume II PDF

By Zeev Alfassi

ISBN-10: 0849345847

ISBN-13: 9780849345845

This well timed e-book covers suggested measurements in addition to behind schedule 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 approach. 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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Additional resources for Activation Analysis, Volume II

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The quantity to be optimized is S V M . 1. Effect of Transfer Times t, and t, The transfer time can be relatively long in the order of 10 s to 1 min when the transfer is done m a n ~ a l l y ,a~method ~ , ~ ~ which sometimes is referred to as Pseudo-Cyclic activation 26 Activation Analysis analysis. ', The transfer time can be made very small when there is no physical transfer of the sample but a pulsed irradiation source is used, which was suggested as the real cyclic activation a n a l y ~ i s .

Fsi CME = MME . f,, + AME . f,, + SME - f,, CAR = AAR . f,, + SAR . fsi + PAR . f, CAE = AAE - fA, + SAE - fsi + PAE . fp CMR = MMR . f,, solving these equations gives f,, = (a, . a, - fsi = ( a , a, . - a, - a@ - a, a6)/6 22 Activation Analysis TABLE 4 Comparison of the Known Elemental Composition of Synthetic Mixtures with Those Measured by Epithermal Neutron Activation Analysis6'" Known mass (pg) Measured mass (mg) where a, = AAR PAE - AAE PAR . a, = AMR . MME - AME . MMR a, = SMR . MME - SME .

8-s half-life. 5-cm NaI (TI) crystals operated in a modified sum-coincidence system. The sensitivity in an interference free matrix was found to be 5 pg. It should be pointed out that 207mPb is the only y emitter formed from lead by (n,y) reaction. Kerr and SpyrouIo6measured the fluorine content of bone and other biological materials by cyclic activation using the (n,y) ' F; tl,2 = 11 S. They corrected for reaction of the only stable isotope of fluorine I9F (n,y) O the interferences due to 23Na (n,a) O ' F by simultaneous measurement of 24Na and 23Ne photopeaks from which the Na content is obtained.

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Activation Analysis, Volume II by Zeev Alfassi


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