ABSTRACT

The distribution of two radicals (CO₃^- and SO₂^-) in natural crystalline gypsum in a bore-hole core from the Konya basin in Turkey was imaged using a home-made electron spin resonance (ESR) microscope. The high concentration of SO₂^- at the center of the crystal indicates that the gypsum has grown from the center to the surface. The high concentration of CO₃^- at the surface would be caused by the external β-rays from sediments. The distribution of impurities was also checked by electron probe X-ray microanalysis (EPMA).