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In-situ method to determine depth distribution of buried activity
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2011 (English)In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 69, no 5, 773-779 p.Article in journal (Refereed) Published
Abstract [en]

A method is described to determine the depth distribution of buried activity offering an alternative to conventional soil sampling and laboratory analysis by in-situ measurements with small detectors inserted into the ground. As ad demonstration of the method small-scale variations in the distribution of Cs-137 in a riparian marsh in central-eastern Sweden are determined using lanthanum bromide detectors (LaBr3). The results show variations of the activity ranging between 400 and 2200 kBq/m^2 over an area not exceeding 350 m^2. The decrease of the average activity since 2003 coincides with the physical decay indicating that no net redistribution of activity into this part of the marsh has occurred during the inter weening years.

Place, publisher, year, edition, pages
2011. Vol. 69, no 5, 773-779 p.
Keyword [en]
In-situ gamma-ray spectroscopy, LaBr3, soil samples, caesium-137
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-47397DOI: 10.1016/j.apradiso.2011.01.012ISI: 000288876700009OAI: oai:DiVA.org:su-47397DiVA: diva2:373879
Available from: 2010-12-01 Created: 2010-12-01 Last updated: 2017-12-12Bibliographically approved
In thesis
1. In situ measurements of radionuclide concentration in soil: An investigation into detector properties and methods
Open this publication in new window or tab >>In situ measurements of radionuclide concentration in soil: An investigation into detector properties and methods
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In case of a release of radioactive nuclides into the environment it is necessary to  have reliable methods to estimate the potential effect on people and the ecosystem. In this context the total activity deposited, the elemental composition and the depth distribution are of importance.

An efficient in situ method to estimate the average contamination over larger areas using high purity germanium (HPGe) detectors has been developed. The method combines simulation of photon transport with measured detector properties. The total activity of 137Cs determined from gamma-ray spectra recorded in situ are compared to results from soil sampling.

Another in situ method has been developed to determine the depth distribution of a radionuclide contamination, using an array of small detectors inserted into the ground, as an alternative to the standard procedure of soil sampling. The possibility to use cadmium telluride (CdTe) detectors as well as lanthanum bromide (LaBr3) detectors has been investigated. As a demonstration of the developed method the small-scale variation of the activity distributions in an area covering 350 m2 have been measured and is compared to results obtained by other methods.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 80 p.
Keyword
In situ gamma-ray spectrometry, LaBr3, CdTe, Cs-137, soil samples
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-47398 (URN)978-91-7447-192-2 (ISBN)
Public defence
2011-01-28, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Submitted. Available from: 2011-01-03 Created: 2010-12-01 Last updated: 2010-12-02Bibliographically approved

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