Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Novelty and change detection radiation physics experiments
KTH, School of Engineering Sciences (SCI), Physics.
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.
Series
Trita-FYS, ISSN 0280-316X ; 2007:35
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-4410ISBN: 978-917178-693-7 OAI: oai:DiVA.org:kth-4410DiVA: diva2:12185
Presentation
2007-06-05, Sal F32, AlbaNova universitetcentrum, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2012-03-20
List of papers
1. Analysis of natural milk and milk powder samples by NAA
Open this publication in new window or tab >>Analysis of natural milk and milk powder samples by NAA
Show others...
1990 (English)In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 144, no 3, 229-239 p.Article in journal (Refereed) Published
Abstract [en]

As a part of the Iraqi Food'Analysis Programme /I.F.A.P./ the concentrationof Na, Mg, P, CI, K, Ca, Zn, Se, Br, Rband I in natural milk collected from different regions of Iraq, and in milkpowder samples have been determined byusing the NAA technique. It was found that except for the elements I, Rb and Br the concentration of the elements was approximately identical in both the natural milks and milk powders.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7230 (URN)10.1007/BF02218167 (DOI)A1990CY89000010 ()
Note
QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2010-11-09Bibliographically approved
2. Multielement determination in rice, wheat, and barley by instrumental neutron activation analysis
Open this publication in new window or tab >>Multielement determination in rice, wheat, and barley by instrumental neutron activation analysis
Show others...
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.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7231 (URN)10.1007/BF02992720 (DOI)A1990EM70100070 ()
Note
QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2010-11-09Bibliographically approved
3. Determination of major, minor and trace elements in Iraqi vegetabel samples by INAA
Open this publication in new window or tab >>Determination of major, minor and trace elements in Iraqi vegetabel samples by INAA
Show others...
1992 (English)In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 159, no 1, 29-36 p.Article in journal (Refereed) Published
Abstract [en]

Vegetable samples collected from different locations in Iraq have been analyzed by the method of instrumental neutron activation analysis for the determination of its content of major, minor and trace elements. Twenty types of vegetables have been analyzed and the concentrations of sixteen elements are presented.

Keyword
neutron-activation analysis
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7232 (URN)10.1007/BF02041014 (DOI)A1992JC59800005 ()
Note
QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2010-11-09Bibliographically approved
4. A new laboratory for measurements of low-level radioactivity
Open this publication in new window or tab >>A new laboratory for measurements of low-level radioactivity
Show others...
2008 (English)In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 66, no 10, 1443-1449 p.Article in journal (Refereed) Published
Abstract [en]

A laboratory for measuring low-level radioactivity has been built at the AlbaNova University Center in Stockholm. Low-level concrete in combination with a 5 cm iron lining provide an average photon fluency rate from terrestrial sources at least a factor of 40 below that in the common laboratories of the Center. The radon activity inside the laboratory has been measured to (3 +/- 2) Bq m(-3). Material considerations are discussed. Construction and performance of the laboratory, as well as the present instrumentation, is described.

Keyword
low-level laboratory, building materials, gamma-ray spectrometry
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7233 (URN)10.1016/j.apradiso.2008.02.086 (DOI)000259385000029 ()2-s2.0-48849088137 (Scopus ID)
Note
Uppdaterad från manuskript till artikel(20101109). QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2010-11-09Bibliographically approved
5. A small expendable UAV for monitoring radiation outlets
Open this publication in new window or tab >>A small expendable UAV for monitoring radiation outlets
Show others...
2006 (English)In: NATO/FOI Workshop on Autonomy in UAV-systems, 2006Conference paper, Published paper (Other academic)
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-7234 (URN)
Conference
NATO/FOI Workshop on Autonomy in UAV-systems, Stockholm, Sweden, September 25-26, 2006
Note

QC 20101109

Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2016-12-21Bibliographically approved

Open Access in DiVA

fulltext(1762 kB)2146 downloads
File information
File name FULLTEXT01.pdfFile size 1762 kBChecksum MD5
411a3fe2f0c738b41e3605fe9771aafa0aa1eed7ce0c9033bd15d6c3b78d45d78b0b2f30
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Jabor, Abbas
By organisation
Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 2146 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 643 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf