Paramagnetic resonance in tooth enamel created by ultraviolet light

Paramagnetic centres are present in human tooth enamel after irradiation with ultraviolet light. Their thermal stability and electron spin resonance spectrum coincide with those of the ion radicals created with γ-rays are used in geological or archaeological dating and accident dosimetry. The long wavelength tail of their creation spectrum intersects with the short wavelength tail of the solar spectrum reaching Earthʹs surface, thus raising the question about the possible effect of solar irradiation on dating and dosimetry.