Speaker
Description
As part of the ongoing "Reference sites for aerial unmanned radiometric survey" project, the CTU in Prague is developing data processing and analysis methods for data from gamma spectrometric scintillation detectors carried by an unmanned aerial system. The acquired data and developed methods shall improve calibration techniques for spectrometers and help characterize the chosen reference areas.
The scintillation spectrometer's gamma spectra provide quantitative and qualitative information on the presence of radionuclides producing the photon field at the measurement point, depending on peak position in the spectra. Quantitative information cannot be immediately obtained from the raw spectra due to the complex interaction and energy deposition processes of gamma photons in the detector, and mathematical analysis is required.
This contribution discusses methods for determining the detector response matrix for the D230A Georadis airborne spectrometer, calculation of air kerma rate, H*(10) and concentrations of 137Cs and K, U, and Th in the surface layer of the soil. Additionally, model calculations for calibration factors enabling assessment of activity of a point source or circular contaminated hotspots for an identified radionuclide are presented, for different heights above the ground level. Spatial resolution assessment of the monitoring with an UAS is also discussed.
This work has been supported by the TA CR project SS06010467.
