Polymetallic nodules (PN) collected from the north-east Pacific Clarion-Clipperton region were investigated with a 192Ir dual-energy gamma-ray computer tomograph. Tomographic images depicting density and effective atomic number distribution of the same section were obtained. These images present a linear response for a broad range of sample densities (0.97–6.22 g/cm3), and likewise effective atomic numbers (5.48–29). Sixty-five successive digital

Five samples of bituminous coal collected from different basins (Australia, Romania, Russia, South Africa and Ukraine) have been investigated by using various analytical techniques. Na, Mg, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Mo, Sn, In, Sb, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Lu, Hf, Ta, W, Hg, Th and U have been determined by neutron activation analysis, 40K, 238U, 235U and 232Th have been measured radiometricaly,

Gamma-ray irradiated fresh cuttlefsh bone display very intense Electron Earamagnetic Resonance (EPR) spectra, which could be attributed to five different centers, including CO2- , previously observed in irradiated carbonates. All centers display a positive correlation with the absorbed dose, described by linear or saturation type dependencies. During 36 h of isothermal annealing at 100 oC, three of them decayed with time exponentially, one remained

Computer axial tomography CAT is one of the most adequate non-destructive techniques for the investigation of the internal structure of a large category of objects. This method, based on the attenuation of X- or gamma-ray, generates digital images which map the numerical values of the linear attenuation coefficient of a section or of the entire volume of the investigated sample. Depending on the energy of the utilized radiation as well as on the