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Development of methods to use CdTe detectors in field measurements
Stockholm University, Faculty of Science, Department of Physics. (nucl)
Stockholm University, Faculty of Science, Department of Physics. (nucl)
Stockholm University, Faculty of Science, Department of Physics. (nucl)
Stockholm University, Faculty of Science, Department of Physics.
2006 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 41, 523-526 p.Article in journal (Refereed) Published
Abstract [en]

We are currently investigating the possibility to use CdTe detectors for in situ determinations of radionuclide concentration in soil. Buried activity can be reliably determined by a comparison of the count rate in the photo peak and the region between the photo peak and Compton edge. However, the pulse-height spectrum from CdTe detectors is severely deteriorated, due to poor charge collection, in particular for high gamma-ray energies. Our efforts have, therefore, been concentrated on improving the peak to valley ratio for such detectors. A simple, non-discriminating, algorithm for the analysis of output from two amplifiers with different shaping times is described. By means of this algorithm the peak-tovalley ratio for a small planar CdTe detector is improved by more than a factor of six compared to the uncorrected ratio without loss of efficiency.

Place, publisher, year, edition, pages
2006. Vol. 41, 523-526 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-12515DOI: 10.1088/1742-6596/41/1/060OAI: oai:DiVA.org:su-12515DiVA: diva2:179035
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2010-12-02Bibliographically 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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