Using the LaBr3Ce scintillation detector for mobile gamma-spectrometry
(2010)Medical Physics Programme
- Abstract (Swedish)
- When doing mobile gamma-spectrometry the equipment has for severaldecades been limited to NaI(Tl) and Ge-based detectors. Recent developements has led to a possible replacement of NaI(Tl)-based systems in the form of a new scintillation material: LaBr3:Ce (cerium doped lanthanum bromide). LaBr3:Ce-detectors successfully compete with NaI(Tl)-based detectors when considering resolution, efficiency, and decay time of the scintillation light. Its only main drawback is the fact that it is internally contaminated. The detector crystal contains a small percentage of the radioactive isotope 138-La as well as 227-Ac, which places the LaBr3:Ce detectorat a disadvantage in comparison to NaI(Tl)-detectors, when measuring low photon fluences.Several... (More)
- When doing mobile gamma-spectrometry the equipment has for severaldecades been limited to NaI(Tl) and Ge-based detectors. Recent developements has led to a possible replacement of NaI(Tl)-based systems in the form of a new scintillation material: LaBr3:Ce (cerium doped lanthanum bromide). LaBr3:Ce-detectors successfully compete with NaI(Tl)-based detectors when considering resolution, efficiency, and decay time of the scintillation light. Its only main drawback is the fact that it is internally contaminated. The detector crystal contains a small percentage of the radioactive isotope 138-La as well as 227-Ac, which places the LaBr3:Ce detectorat a disadvantage in comparison to NaI(Tl)-detectors, when measuring low photon fluences.Several methods for compensating for the internal contamination areexplored in this thesis. Two of those methods were found to work well for usage in a static measurement setup and a mobile setup respectively. The problem of energy calibration drift, caused by temperature change and other causes, is also explored as this is a cause for concern when doing background compensation. Furthermore, a test to study if it is possible to use the LaBr3:Ce-detector in a multi-detector system has been done with positive results (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/2157130
- author
- Nilsson, Jonas
- supervisor
- organization
- year
- 2010
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Radioekologi
- language
- English
- id
- 2157130
- date added to LUP
- 2011-09-13 13:39:41
- date last changed
- 2011-09-13 13:39:41
@misc{2157130,
abstract = {{When doing mobile gamma-spectrometry the equipment has for severaldecades been limited to NaI(Tl) and Ge-based detectors. Recent developements has led to a possible replacement of NaI(Tl)-based systems in the form of a new scintillation material: LaBr3:Ce (cerium doped lanthanum bromide). LaBr3:Ce-detectors successfully compete with NaI(Tl)-based detectors when considering resolution, efficiency, and decay time of the scintillation light. Its only main drawback is the fact that it is internally contaminated. The detector crystal contains a small percentage of the radioactive isotope 138-La as well as 227-Ac, which places the LaBr3:Ce detectorat a disadvantage in comparison to NaI(Tl)-detectors, when measuring low photon fluences.Several methods for compensating for the internal contamination areexplored in this thesis. Two of those methods were found to work well for usage in a static measurement setup and a mobile setup respectively. The problem of energy calibration drift, caused by temperature change and other causes, is also explored as this is a cause for concern when doing background compensation. Furthermore, a test to study if it is possible to use the LaBr3:Ce-detector in a multi-detector system has been done with positive results}},
author = {{Nilsson, Jonas}},
language = {{eng}},
note = {{Student Paper}},
title = {{Using the LaBr3Ce scintillation detector for mobile gamma-spectrometry}},
year = {{2010}},
}