COMPOSITIONAL INHOMOGENEITY OF SEDIMENTS AND ITS POTENTIAL EFFECTS ON DOSE RATE ESTIMATION FOR ELECTRON SPIN RESONANCE DATING OF TOOTH ENAMEL

Archaeometry ◽  
1997 ◽  
Vol 39 (1) ◽  
pp. 169-176 ◽  
Author(s):  
P. A. MELLARS ◽  
L. P. ZHOU ◽  
E. A. MARSEGLIA
Keyword(s):  
Electron Spin Resonance ◽  
Dose Rate ◽  
Electron Spin ◽  
Tooth Enamel ◽  
Rate Estimation ◽  
Spin Resonance

scholarly journals Detailed protocol for an accurate non-destructive direct dating of tooth enamel fragment using Electron Spin Resonance

2013 ◽  
Vol 40 (4) ◽  
pp. 322-333 ◽  
Author(s):  
Renaud Joannes-Boyau
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Tooth Enamel ◽  
Dose Assessment ◽  
Complex Task ◽  
Assessment Protocol ◽  
Spin Resonance ◽  
Non Destructive ◽  
Complete Investigation ◽  
Detailed Protocol

Abstract In the context of human evolution, fossil remains are too valuable to be destroyed and any alteration should be kept to a minimum. The newly developed protocol on fossil fragments has open the gate for ‘virtually’ non-destructive ESR (Electron Spin Resonance) direct dating of human remains. The method allows the separation of unstable and interfering signals that were responsible for large dose underestimation. While a complete investigation of the ESR signal remains a complex task and requires numerous hours of manipulations, a rapid dose assessment protocol can be achieve without compromising the accuracy nor the integrity of the sample. The new protocol should be used for future dating regardless of the possibility of measuring powder.

Electron spin resonance dating of tooth enamel

1987 ◽  
Vol 24 (5) ◽  
pp. 1022-1037 ◽  
Author(s):  
Rainer Grün ◽  
Henry P. Schwarcz ◽  
Steve Zymela
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Tooth Enamel ◽  
Middle Pleistocene ◽  
External Irradiation ◽  
Modulation Amplitude ◽  
Environmental Radiation ◽  
Beta Particles ◽  
Spin Resonance ◽  
Saturation Effects

The amplitude of the electron spin resonance (ESR) peak at g = 2.0018 for hydroxyapatite of fossil tooth enamel can be used to measure the acquired radiation dose (AD) and thus the time (T) since burial of the tooth in a sediment. No significant fading or saturation occurs up to at least 1 Ma, permitting dating of middle Pleistocene deposits. AD is determined by the additive-dose method, using a sufficiently large modulation amplitude to avoid the interference of organic free radicals, and a logarithmic transformation of the ESR intensity to correct for saturation effects. AD increases through time as a result of (1) constant irradiation by U, K, and Th in the surrounding sediment and by cosmic rays; (2) external irradiation by beta particles from U in the dentine; and (3) alpha and beta particles from U in the enamel. We derive an expression for AD(T) taking into account (1) approach to equilibrium between U and its long-lived daughters; and (2) T-dependent (early or linear) uptake of U by dentine or cement and by enamel, as well as the constant environmental radiation sources. T is determined by iteratively solving this expression to obtain the observed AD. An example is given of the dating of an elephant tooth from a preglacial deposit in Alberta: the calculated age is consistent with assignment to isotope stages 5c–5e.

Conversion from Tooth Enamel Dose to Organ Doses for Electron Spin Resonance Dosimetry

2002 ◽  
Vol 39 (9) ◽  
pp. 964-971 ◽  
Author(s):  
Fumiaki TAKAHASHI ◽  
Yasuhiro YAMAGUCHI ◽  
Midori IWASAKI ◽  
Chuzo MIYAZAWA ◽  
Tatsuji HAMADA ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Tooth Enamel ◽  
Organ Doses ◽  
Spin Resonance

Electron spin resonance (ESR) dating of the origin of modern man

1992 ◽  
Vol 337 (1280) ◽  
pp. 145-148 ◽  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Cultural Evolution ◽  
Tooth Enamel ◽  
Archaeological Sites ◽  
Esr Dating ◽  
Spin Resonance ◽  
Anatomically Modern Humans ◽  
Radioactive Radiation ◽  
Accumulated Dose

Many materials found in archaeological sites are able to trap electronic charges as a result of bombardment by radioactive radiation from the surrounding sediment. The presence of these trapped charges can be detected by electron spin resonance (ESR) spectroscopy: the intensity of the ESR signal is a measure of the accumulated dose and thus of the age. Tooth enamel is ubiquitous at archaeological sites and is well suited for ESR dating, with a precision of about 10-20%. This method has now been used to date many sites critical to the biological and cultural evolution of modern man. Dates for sites in Israel and Africa have demonstrated the existence of anatomically modern humans more than 100 ka ago.

Electron-Spin-Resonance Dating of Tooth Enamel From Klasies River Mouth Cave

1990 ◽  
Vol 31 (4) ◽  
pp. 427-432 ◽  
Author(s):  
Rainer Grun ◽  
Nicholas J. Shackleton ◽  
Hilary J. Deacon
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Tooth Enamel ◽  
River Mouth ◽  
Spin Resonance
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