Esr dating range
In teeth, one observes often strongly varying uranium contents on microscopic scale causing steep dose-rate gradients, which is in particular the case for the b-component since the b-radiation range (ca.
1 mm) is similar to the thickness of the enamel layers.
Teeth gradually take up uranium from the groundwater after burial.
In vivo they contain less than 1 mg/g U, but fossil ones up to 1,500 mg/g.
The condition at which resonance happens is described by the g-value, which is characteristic for the type of the paramagnetic center.The ESR phenomenon is caused by paramagnetic centers in the crystal lattice.Radiation-induced trapped electrons, mentioned already in the context of luminescence dating, form such centers and give rise to characteristic ESR signals.Electron spin resonance (ESR) dating is also based on the accumulation of radiation-induced energy in minerals and thus has close links to luminescence dating.Although first attempts to exploit the ESR phenomenon for dating go back to the 1960s (Zeller et al.
Mammalian dental issue consists essentially of enamel, dentine, and cementum layers.