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Multielement determination in rice, wheat, and barley by instrumental neutron activation analysis
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1990 (English)In: Biological Trace Element Research, ISSN 0163-4984, E-ISSN 1559-0720, Vol. 26/27, 637-645 p.Article in journal (Refereed) Published
Abstract [en]

INAA has been used for the determination of Na, Mg, Al, Cl, K, Sc, Cr, Mn, Fe, Co, Cu, Zn, As, Se, Br, Rb, Sr, Mo, and W in grains of rice, wheat, and barley, which were collected from different plant fields in Iraq. Samples and standards were irradiated in the IRT-5000 reactor, at neutron fluxes of 2 × 1013 cm−2·s−1 and 3.2 × 1011 cm−2·s−1. Interferences of photopeaks with each other were considered, and reaction interferences were calculated and determined experimentally. Accuracy of our method was assessed by the analysis of IAEA standards Wheat Flour and Bovine liver. A good agreement has been achieved between the present results and recommended values. The precision and detection limit were determined for all elements in all types of grain.

Place, publisher, year, edition, pages
1990. Vol. 26/27, 637-645 p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-7231DOI: 10.1007/BF02992720ISI: A1990EM70100070OAI: diva2:12181
QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2010-11-09Bibliographically approved
In thesis
1. Novelty and change detection radiation physics experiments
Open this publication in new window or tab >>Novelty and change detection radiation physics experiments
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis deals with the detection and analysis of low-level natural and induced radioactivity. Using high energy-resolution Ge detectors in low-level counting areas airborne radioactivity’s like Be-7 and Cs-137 have been investigated. The experimental facilities and techniques are described in some detail.

One of the aims in this work is the studying of change detection in the amount of the activity received on the earth from events that happen at the solar system. Information about this is achieved by measuring the activity of the Be-7 isotope, which is a very good indicator of the solar protons that reach the atmosphere of the Earth. Therefore Be-7 probes the variation of the boundary conditions on the Earth related to solar events as well as transportation between the atmospheric layers, troposphere and stratosphere, which are the layers nearest to the ground. Results obtained by this work refer to the seasonal variation and the eleven years sun cycle in addition to the two to three years cycle expected by some scientists. These results are shown in many figures of the activity measurements and the Fourier transformation of the intensity of the Be-7.

The effect of the man-made radiation in the air was studied by collection of Cs-137, which was contaminating most of countries in the world after the Chernobyl accident. Our search for low levels of Cs-137 shows how important it is to use a Low Level Laboratory, like the one at AlbaNova, for measurements of novelty and change.

Studying the airborne activity in Sweden and Finland at the same time and time interval gives us a possibility to look for correlations of the fall down of the Be-7 activity from the upper layers of the atmosphere simultaneously in both countries.

This thesis also involves the results of Neutron Activation Analysis Technique applied to the general human food, milk, vegetables and grains. The experiments were performed at the neutron beam of the Iraqi reactor IRT 5000 at Baghdad. The goal of the experiments was to determine iodine and other trace elements after the Chernobyl accident compared to results from different countries.

An exploratory, preliminary study of airborne activities, following e.g. an accident at a nuclear power plant, or leakage of radiation from any source of contamination at any region, using a small, expendable unmanned aerial vehicle is also discussed briefly.

Place, publisher, year, edition, pages
Stockholm: Fysik, 2007
Trita-FYS, ISSN 0280-316X ; 2007:35
National Category
Physical Sciences
urn:nbn:se:kth:diva-4410 (URN)978-917178-693-7 (ISBN)
2007-06-05, Sal F32, AlbaNova universitetcentrum, Roslagstullsbacken 21, Stockholm, 10:00
Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2012-03-20

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