Methods for analysing data from in-situ ground-based and UAS-borne scintillation gamma spectrometry

Authors

  • Jaroslav Klusoň Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Dosimetry and Application of Ionising Radiation, Břehová 7, 115 19 Prague, Czech Republic https://orcid.org/0000-0002-1625-211X
  • Václav Štěpán Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Dosimetry and Application of Ionising Radiation, Břehová 7, 115 19 Prague, Czech Republic https://orcid.org/0000-0002-7696-2877
  • Lenka Thinová Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Dosimetry and Application of Ionising Radiation, Břehová 7, 115 19 Prague, Czech Republic https://orcid.org/0000-0001-8277-1121
  • Martin Kaschner Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Dosimetry and Application of Ionising Radiation, Břehová 7, 115 19 Prague, Czech Republic https://orcid.org/0000-0002-4873-4025
  • Ondřej Šálek Charles University, Faculty of Science, Albertov 6, 128 00 Prague, Czech Republic https://orcid.org/0000-0001-8140-7600

DOI:

https://doi.org/10.14311/AP.2026.66.0421

Keywords:

ionizing radiation, gamma spectrometry, unmanned aerial systems, radiometric reference sites

Abstract

This article extends established methods for determining dosimetric quantities characterising monitored photon fields and for estimating the superficial activity of 137Cs and the concentrations of K, U, and Th in the soil surface layer from spectra acquired during in-situ environmental monitoring on the ground or using unmanned aerial systems (UASs). These methods are based on the response matrices of scintillation detection systems simulated using the Monte Carlo method and on the unfolding technique. This work implements these methods in a unified Python-based workflow for ground-based and UAS-borne scintillation spectrometry, with device-specific response matrices and response functions that directly account for soil water content and height above the ground. The software is complemented by newly established reference sites for unmanned aerial radiometric surveys. Together, they provide the infrastructure for testing and further development of the full acquisition-to-evaluation chain.

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References

[1] J. Klusoň. Environmental monitoring and in situ gamma spectrometry. Radiation Physics and Chemistry 61(3–6):209–216, 2001. https://doi.org/10.1016/S0969-806X(01)00242-0

[2] J. Klusoň. In-situ gamma spectrometry in environmental monitoring. Applied Radiation and Isotopes 68(4–5):529–535, 2010. https://doi.org/10.1016/j.apradiso.2009.11.041

[3] L. Thinova, T. Cechak, J. Kluson, T. Trojek. Use of gamma spectrometry method for environmental monitoring in the area of NPP. Journal of Physics Conference Series 41(1):569, 2006. https://doi.org/10.1088/1742-6596/41/1/071

[4] J. A. Corbacho, A. Baeza. In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits. Journal of Radiological Protection 42(2):021501, 2022. https://doi.org/10.1088/1361-6498/ac4116

[5] J. Kluson, L. Thinova, M. Neznal, T. Svoboda. Remedial activities effectiveness verification in tailing areas. Radiation Protection Dosimetry 164(4):523–528, 2015. https://doi.org/10.1093/rpd/ncv339

[6] C. Kunze, B. Preugschat, R. Arndt, et al. Development of a UAV-based gamma spectrometry system for natural radionuclides and field tests at Central Asian uranium legacy sites. Remote Sensing 14(9):2147, 2022. https://doi.org/10.3390/rs14092147

[7] S. van der Veeke. UAV-borne radioelement mapping: towards a guideline and verification methods for geophysical field measurements. Ph.D. thesis, University of Groningen, Netherlands, 2023. https://doi.org/10.33612/diss.261264637

[8] Y. Sanada, T. Torii. Aerial radiation monitoring around the Fukushima Dai-ichi nuclear power plant using an unmanned helicopter. Journal of Environmental Radioactivity 139:294–299, 2015. https://doi.org/10.1016/j.jenvrad.2014.06.027

[9] D. T. Connor, K. Wood, P. G. Martin, et al. Radiological mapping of post-disaster nuclear environments using fixed-wing unmanned aerial systems: A study from Chornobyl. Frontiers in Robotics and AI 6:149, 2020. https://doi.org/10.3389/frobt.2019.00149

[10] J. Limburg, R. L. Koomans, S. van der Veeke. Scintillators in the wild: the present and future of gamma-ray sensing in geophysical applications. Radiation Measurements 195:107684, 2026. https://doi.org/10.1016/j.radmeas.2026.107684

[11] L. Thinova, J. Kluson. Irradiation of population in the surrounding area of nuclear power plant Temelin. AIP Conference Proceedings 1034:513–516, 2008. https://doi.org/10.1063/1.2991280

[12] J. Klusoň, L. Thinová. The use of deconvolution technique for the analysis of gamma spectrometry data from field monitoring using unmanned aerial vehicles. Radiation Protection Dosimetry 186(2–3):284–287, 2019. https://doi.org/10.1093/rpd/ncz209

[13] A. Maino, M. Alberi, E. Anceschi, et al. Airborne radiometric surveys and machine learning algorithms for revealing soil texture. Remote Sensing 14(15):3814, 2022. https://doi.org/10.3390/rs14153814

[14] J. Klusoň, L. Thinová. Model calibration of an airborne gamma spectrometer for searching of radionuclide sources using UAV. Radiation Protection Dosimetry 198(9–11):650–653, 2022. https://doi.org/10.1093/rpd/ncac113

[15] D. Breitenmoser, A. Stabilini, M. M. Kasprzak, S. Mayer. Development and validation of a high-fidelity full-spectrum Monte Carlo model for the Swiss airborne gamma-ray spectrometry system. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1077:170512, 2025. https://doi.org/10.1016/j.nima.2025.170512

[16] J. Klusoň. Modeling the spatial resolution and flight altitude dependence of the response in radiometric monitoring using UAV. Radiation Protection Dosimetry 198(9–11):646–649, 2022. https://doi.org/10.1093/rpd/ncac112

[17] P. J. Clements. A discussion of variations on the Scofield-Gold iterative deconvolution technique. AERE-R 7222. AERE, Harwell, Berkshire, 1972.

[18] H. Dembinski, M. Schmelling, R. Waldi. Application of the iterated weighted least-squares fit to counting experiments. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 940:135–141, 2019. https://doi.org/10.1016/j.nima.2019.05.086

[19] N. E. Scofield. A technique for unfolding gamma-ray scintillation spectrometer pulse-height distributions. Tech. Rep. USNRDL-TR-447, U. S. Naval Radiological Defense Laboratory, San Francisco, California, 1960.

[20] R. Gold. An iterative unfolding method for response matrices. Tech. Rep. ANL-6984, Argonne National Laboratory, 1964. https://doi.org/10.2172/4634295

[21] L. Løvborg. The calibration of portable and airborne gamma-ray spectrometers – Theory, problems, and facilities. Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi, 1984. [2026-08-06]. https://findit.dtu.dk/en/catalog/537f0c8f7401dbcc120019c8

[22] G. Erdi-Krausz, M. Matolin, B. Minty, et al. Guidelines for radioelement mapping using gamma ray spectrometry data. Tech. Rep. IAEA-TECDOC-1363, IAEA, 2003.

[23] C. J. Werner (ed.). MCNP® user’s manual – Code version 6.2. Tech. Rep. LA-UR-17-29981, Los Alamos National Laboratory, Los Alamos, NM, USA, 2017.

[24] R. J. McConn, Jr., C. J. Gesh, R. T. Pagh, et al. Compendium of material composition data for radiation transport modeling. Tech. Rep. PIET-43741-TM-963, PNNL-15870, Pacific Northwest National Laboratory, 2011. https://doi.org/10.2172/1023125

[25] J. Klusoň, T. Urban, L. Thinová. Study of errors using scintillation spectra unfolding for the calculation of photon field dosimetric characteristics. Radiation Physics and Chemistry 116:100–105, 2015. https://doi.org/10.1016/j.radphyschem.2015.03.009

[26] ICRP. Conversion coefficients for use in radiological protection against external radiation. Annals of the ICRP 28(3–4), 1996.

[27] M. Baldoncini, M. Albéri, C. Bottardi, et al. Investigating the potentialities of Monte Carlo simulation for assessing soil water content via proximal gamma-ray spectroscopy. Journal of Environmental Radioactivity 192:105–116, 2018. https://doi.org/10.1016/j.jenvrad.2018.06.001

[28] P. Bechtold. Atmospheric thermodynamics. Tech. rep., European Centre for Medium-Range Weather Forecasts (ECMWF), 2015. [2026-02-24]. https://www.ecmwf.int/en/elibrary/79886-atmospheric-thermodynamics

[29] A. Picard, R. S. Davis, M. Gläser, K. Fujii. Revised formula for the density of moist air (CIPM-2007). Metrologia 45(2):149, 2008. https://doi.org/10.1088/0026-1394/45/2/004

[30] M. Matolín, P. Křesťan, V. Stoje. Standardy pro terénní spektrometry gama ve Stráži pod Ralskem [In Czech; Standards for field gamma-ray spectrometers in Czech Republic]. EGRSE: International Journal of Exploration Geophysics, Remote Sensing and Environment 18(3):98–105, 2011.

[31] M. Matolín. Kalibrace přenosných gamaspektrometrů na standardech kalibrační základny DIAMO, s.p. ve Stráži pod Ralskem a stanovení pozadí [In Czech; Calibration of portable gamma-ray spectrometers using the standards of the DIAMO calibration facility in Stráž pod Ralskem and determination of background], 2017. [2026-08-06]. http://www.gammastandard.com/dow/Kalibrace2017.pdf

[32] R. L. Grasty, P. B. Holman, Y. B. Blanchard. Transportable calibration pads for ground and airborne gamma-ray spectrometers. No. 90-23 in Geological survey of Canada. Energy, Mines, and Resources Canada, 1991.

[33] O. Šálek, V. Štěpán, J. Klusoň, L. Thinová. Metodika pro využívání referenčních ploch pro bezpilotní radiometrický průzkum [In Czech; Methodology for the use of reference sites for unmanned radiometric surveys, Approved methodology]. State Office for Nuclear Safety, 2026.

[34] O. Šálek, V. Štěpán. Reference areas for unmanned aerial radiometric survey – leaflet for prospective users. Czech Technical University in Prague, Czech Republic, 2026. https://doi.org/10.5281/zenodo.19286437

[35] O. Šálek, V. Štěpán. Mapy referenčních ploch pro letecký bezpilotní radiometrický průzkum [In Czech; Maps of reference sites for UAV radiometric survey], 2026. https://doi.org/10.5281/zenodo.18431149

[36] European Union Aviation Safety Agency. Easy access rules for unmanned aircraft systems, 2026. [2026-08-06]. https://www.easa.europa.eu/en/regulations/unmanned-aircraft-systems-uas

[37] S. van der Veeke, J. Limburg, R. L. Koomans, et al. Footprint and height corrections for UAV-borne gamma-ray spectrometry studies. Journal of Environmental Radioactivity 231:106545, 2021. https://doi.org/10.1016/j.jenvrad.2021.106545

[38] B. R. S. Minty, A. P. J. Luyendyk, R. C. Brodie. Calibration and data processing for airborne gamma-ray spectrometry. AGSO Journal of Australian Geology and Geophysics 17(2):51–62, 1997.

[39] P. Jurza, I. Campbell, P. Robinson, et al. Use of 214Pb photopeaks for radon removal: Utilising current airborne gamma-ray spectrometer technology and data processing. Exploration Geophysics 36(3):322–328, 2005. https://doi.org/10.1071/EG05322

[40] Y. Gu, H. Lu, M. Wang, et al. Advanced spectral-ratio radon background estimate in airborne gamma-ray spectrometry and calibration technology. Journal of the Korean Physical Society 76(5):392–400, 2020. https://doi.org/10.3938/jkps.76.392

[41] J. Xia, B. Song, Y. Gu, et al. Application of advanced spectral-ratio radon background correction in the UAV-borne gamma-ray spectrometry. Nuclear Engineering and Technology 55(8):2927–2934, 2023. https://doi.org/10.1016/j.net.2023.04.034

[42] V. Štěpán, O. Šálek, J. Valenta, et al. Referenční plochy pro letecký bezpilotní radiometrický průzkum – databáze výsledků [In Czech; Reference sites for unmanned aerial radiometric survey – Database of results], 2026. https://doi.org/10.5281/zenodo.19360823

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Published

2026-09-08

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How to Cite

Klusoň, J., Štěpán, V., Thinová, L., Kaschner, M., & Šálek, O. (2026). Methods for analysing data from in-situ ground-based and UAS-borne scintillation gamma spectrometry. Acta Polytechnica, 66(4), 421-432. https://doi.org/10.14311/AP.2026.66.0421