Paramagnetic centres are present in human tooth enamel after irradiati
on with ultraviolet light. Their thermal stability and electron spin r
esonance spectrum coincide with those of the ion radicals created with
gamma-rays are used in geological or archaeological dating and accide
nt dosimetry. The long wavelength tail of their creation spectrum inte
rsects with the short wavelength tail of the solar spectrum reaching E
arth's surface, thus raising the question about the possible effect of
solar irradiation on dating and dosimetry. Copyright (C) 1996 Elsevie
r Science Ltd