|
You are here: Homepage  NKS Reports View document |
| |
| NKS Programme Area: | NKS-B | | Research Area: | Measurement Strategy, Technology and QA | | Report Number: | NKS-505 | | Report Title: | Symmetrical Array Methodology for Gamma Source Localization: Technology Transfer Workshop and Field Event (SAMLOC) | | Activity Acronym: | SAMLOC | | Authors: | Harri Toivonen, Mark Dowdall, Sakari Ihantola, Gísli Jónsson, Pernille Ahlmann Jensen, Jussi Huikari, Kari Peräjärvi, Philip Holm, Aliaksandr Dvornik, Maria Karampiperi, Christopher Rääf, Viktor Lehmann, Robert Finck, Christian Bernhardsson, | | Abstract: | Effective response to incidents involving searches for nuclear or other radioactive materials out of regulatory control (MORC) is dependent on rapid localization of the source, which is often hindered due to a general lack of available, efficient, robust directionally sensitive detector systems designed for field and security applications. The SAMLOC project assembled Nordic expertise in this area to test new developments, exchange technologies and experience and enhance Nordic capacities in this field. The primary objective of SAMLOC was is to investigate the application of the symmetrical array method to detector types employed in the Nordic region and to test this and conventional methods in tests of directional estimation. The project demonstrated that simple models, developed for rectangular and cylindrical detector geometries, explain well the directional data acquired with 2x1 arrays of detectors. The models function well for large detectors which provide inherent attenuation of photons in the front detector, preventing them reaching the back detector. A shield of 4 cm Pb between detectors was sufficient for a good directional response. Comparison measurements were performed between 2x1 and 2x2 arrays. The latter was technically superior having 360 degrees field of view, and there was no need to perform any modelling of the array. However, a 2x1 array is technically much simpler and cheaper, albeit with lower directional accuracy. The array is well suited for static surveillance of an area of interest and is of relevance in nuclear security applications. | | Keywords: | Gamma spectrometry, detector arrays, source locations, directionality | | Publication date: | 01 Oct 2025 | | ISBN: | 978-87-7893-603-5 | | Number of downloads: | 56 | | Download: |  NKS-505.pdf |
|
|
