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The monostandard method in thermal neutron activation analysis of geological, biological and environmental materials |
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| Authors: | A Alian R G Djingova B Kröner and B Sansoni |
| Institution: | (1) Central Department for Chemical Analysis, Nuclear Research Establishment Jülich GmbH, D-5170 Jülich 1, Federal Republic of Germany;(2) Present address: Faculty of Science, University of Garyounis, Benghazi, Libya |
| Abstract: | Summary A simple method is decribed for instrumental multielement thermal neutron activation analysis using a monostandard. For geological and air dust samples, iron is used as a comparator, while sodium has advantages for biological materials.To test the capabilities of this method, the values of the effective cross sections of the 23 elements determined were evaluated in a reactor site with an almost pure thermal neutron flux of about 9·1012 n·cm–2·s–1 and an epithermal neutron contribution of less than 0.03%. The values obtained were found to agree mostly well with the best literature values of thermal neutron cross sections. The results of an analysis by activation in the same site agree well with the relative method using multielement standards and for several standard reference materials with certified element contents. A comparison of the element contents obtained by the monostandard and relative methods together with corresponding precisions and accuracies is given.Die Monostandardmethode bei der Aktivierungsanalyse mit thermischen Neutronen von geologischem, biologischem und Umweltmaterial Zusammenfassung Die Monostandardmethode wurde erstmals auf die Aktivierungsanalyse mit rein thermischen Neutronen aus der thermischen Säule des Reaktors FRJ-2 (mit epithermischen Anteilen von < 0,03%) angewendet. Hier sind die theoretischen Verhältnisse und damit auch Gleichungen besonders einfach. — Die bei einem Neutronenfluß von 9·1012 n·cm–2·s–1 ermittelten effektiven Neutroneneinfangquerschnitte stimmen häufig gut mit den Literaturwerten überein. — Für geologische Proben wurde Eisen, für biologisches Material Natrium als Komparator, d.h. Monoelementstandard, verwendet. Es konnten über zwanzig Elemente in Andesit, Granit, Flugstaubasche, Luftstaub, Pflanzenmaterial und Obstblättern bestimmt werden. Dedicated to Professor Dr. Kurt Starke, University of Marburg/ Lahn on the occasion of his 70 th birthday Fourth Communication on Improvement of Instrumental Analysis for Service Analysis Guest Scientist from Egypt. Guest Scientist under IAEA-Fellowship from the Faculty of Chemistry, University of Sofia, Bulgaria This paper is an extract of the more detailed Report Jül-1822 (ISSN 0366-0885), January 1983. |
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