Application of gamma spectrometry for quality testing in building materials

Gamma-ray spectrometry is an essential analytical technique in environmental studies, providing valuable insights into radionuclides in building materials. This method enables researchers to assess potential radiation exposure and ensure compliance with safety regulations. By identifying specific isotopes, scientists can evaluate the radiological impact on public health and the environment. It uses the energy spectrum of emitted gamma rays to determine the type and quantity of isotopes present in samples. This study applies gamma-ray spectrometry to quality testing through case studies of commonly used building material samples in Brazil, using ISO and ABNT NBR standards as parameters. The main results discussed here demonstrate the potential for the development of gamma-ray spectrometry in the civil construction field. The identification of radioisotopes, the relationship between radionuclides and the standard composition of the samples, and the simplification of processes for obtaining results were fundamental to ensuring the quality and application of the technique. Although it has limitations, such as the need for large amounts of data, skilled labor, and proper sample preparation, the technique represents a significant improvement over current analytical methods, offering advantages in non-destructiveness and multi-elemental simultaneous detection compared to X-ray Fluorescence (XRF), Energy Dispersive Spectroscopy (EDS), and X-ray Diffraction (XRD), while also providing radiological characterization not accessible through those techniques, as well as in environmental sciences. In this context, the results showed that some building materials—such as sands, mortars, granites, enamel paints, and bricks—exhibit significant compositional differences from standard materials, as detected through gamma spectra and peak counting. These anomalies may compromise structural integrity and pose risks in Brazilian dwellings.