Principle and Procedures of ESR Dating Natural Radiation Effect

1 Principle and Procedures of ESR Dating Natural Radiation Effect. - 

Natural radiation, a-, (3- and y-rays from radioactive elements in the environment or intrinsic to materials, ionizes the materia] and produces paramagnetic defects or radicals. They are often quite stable and accumulate with time. The ESR signal intensity is proportional to the total dose of natural radiation, i.e., to the product between the annual radiation dose rate and the time elapsed after their formation or an event which zeroed the spin concentration. 

The signal intensity is enhanced linearly as a function of the absorbed dose of artificial irradiation, Q, (Q = D t1) 

4 Theoretical Extrapolation Can Natural Radiation be Simulated by a Billion Times More Intense Artificial One This is acommon question in all dating method utilizing natural radiation effects. The irradiation time t in hour is less than one-billionth of the age T, while the dose rate of artificial irradiation, D is a billion times higher than natural one D. 

A new additive dose method is proposed to obtain the age directly without extrapolating the growth curve.1115 The experimental growth curve at the artificial irradiation dose rate gives simply the defect production efficiency (G-value) from the initial growth and the interaction distance, d, between spins from the saturation behaviour. The latter involves the effect of magnetic dipolar and exchange interactions of similar and dissimilar spins and also destabilization of a spin in a distorted area by a local lattice distortion. 

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