Chemical composition and radionuclide activity concentration data for NORM materials used in construction [Dataset]

Table (HORRADIONEX XRF.csv): Dataset containing the chemical composition (major and trace elements) of construction materials with natural radioactivity (NORM), measured by X-ray fluorescence (XRF). Table (gamma horradionex.pdf): Dataset containing radionuclide activity concentration data (e.g., ²³⁸U, ²³²Th, ⁴⁰K) for the same materials, measured by high-resolution gamma spectrometry. Uncertainties are reported with a coverage factor k=2. Data were collected between 2020 and 2025 in Spain, Italy, China, Morocco, Czechia, France, and Portugal. Both files refer to the same set of samples and are part of the HORRADIONEX research project (PID2020-116002RB-100, funded by AEI/10.13039/501100011033).