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
A new laboratory for measurements of low-level radioactivity
Stockholms Universitet.
KTH, School of Engineering Sciences (SCI), Physics.
Stockholms Universitet.
KTH, School of Engineering Sciences (SCI), Physics.
Show others and affiliations
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.

Place, publisher, year, edition, pages
2008. Vol. 66, no 10, 1443-1449 p.
Keyword [en]
low-level laboratory, building materials, gamma-ray spectrometry
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-7233DOI: 10.1016/j.apradiso.2008.02.086ISI: 000259385000029Scopus ID: 2-s2.0-48849088137OAI: oai:DiVA.org:kth-7233DiVA: diva2:12183
Note
Uppdaterad från manuskript till artikel(20101109). QC 20101109Available from: 2007-05-30 Created: 2007-05-30 Last updated: 2017-12-14Bibliographically 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
Series
Trita-FYS, ISSN 0280-316X ; 2007:35
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4410 (URN)978-917178-693-7 (ISBN)
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

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Norlin, Lars-OlovJabor, Abbas
By organisation
Physics
In the same journal
Applied Radiation and Isotopes
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 77 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