Bayesian algorithm to estimate position and activity of an orphan gamma source utilizing multiple detectors in a mobile gamma spectrometry system
To avoid harm to the public and the environment, lost ionizing radiation sources must be found and brought back under the regulatory control as soon as possible. Usually, mobile gamma spectrometry systems are used in such search missions. It is possible to estimate the position and activity of point...
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| creator | Bukartas, Antanas Wallin, Jonas Finck, Robert Rääf, Christopher |
| description | To avoid harm to the public and the environment, lost ionizing radiation sources must be found and brought back under the regulatory control as soon as possible. Usually, mobile gamma spectrometry systems are used in such search missions. It is possible to estimate the position and activity of point gamma sources by performing Bayesian inference on the measurement data. The aim of this study was to theoretically investigate the improvements in the Bayesian estimations of the position and activity of a point gamma source due to introduction of data from multiple detectors with angular variations of efficiency. Three detector combinations were tested-a single 123% HPGe detector, single 4l NaI (Tl) detector and a 123% HPGe with 2x4l NaI (Tl) detector combination-with and without angular efficiency variations for each combination resulting in six different variants of the Bayesian algorithm. It was found that introduction of angular efficiency variations of the detectors did improve the accuracy of activity estimation slightly, while introduction of data from additional detectors lowered the signal-to-noise ratio threshold of the system significantly, increasing the stability and accuracy of the estimated source position and activity, for a given signal-to-noise ratio. |
| doi_str_mv | 10.1371/journal.pone.0245440 |
| format | Article |
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It was found that introduction of angular efficiency variations of the detectors did improve the accuracy of activity estimation slightly, while introduction of data from additional detectors lowered the signal-to-noise ratio threshold of the system significantly, increasing the stability and accuracy of the estimated source position and activity, for a given signal-to-noise ratio.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>33481856</pmid><doi>10.1371/journal.pone.0245440</doi><tpages>e0245440</tpages><orcidid>https://orcid.org/0000-0003-0381-6593</orcidid><orcidid>https://orcid.org/0000-0002-8407-8993</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Algorithms Atoms & subatomic particles Attenuation coefficients Bayesian analysis Bayesian statistical decision theory Clinical Medicine Computer programs Drafting software Editing Efficiency Energy Engineering and Technology Fluence Funding Gamma rays Incidence angle Ionizing radiation Klinisk medicin Medical and Health Sciences Medicin och hälsovetenskap Methods Photomultiplier tubes Photons Physical Sciences Physics Radiation Radiation detectors Radiation shielding Radiation sources Radiologi och bildbehandling Radiology, Nuclear Medicine and Medical Imaging Research and Analysis Methods Reviews Scientific imaging Software Spectrometry Statistical analysis Velocity |
| title | Bayesian algorithm to estimate position and activity of an orphan gamma source utilizing multiple detectors in a mobile gamma spectrometry system |
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