Subject(s)
Catholicism , Embryo Disposition/legislation & jurisprudence , Embryo, Mammalian , Fertilization in Vitro/legislation & jurisprudence , Adoption , Beginning of Human Life , Cryopreservation , Humans , Legislation, Medical , Ownership/legislation & jurisprudence , Privacy/legislation & jurisprudence , United StatesABSTRACT
Intercomparison of EPR-dosimetric techniques using tooth enamel had been performed in order to check whether the results produced by different laboratories are consistent and accurate. Participants were supposed to evaluate doses applied to pulverized enamel samples, using routine techniques from their laboratories. The intercomparison has demonstrated a great variety of methods used for dose reconstruction. Peculiarities of experimental approaches are discussed systematically in terms of procedure for recording the EPR-spectra, determination of the amplitude of the radiation induced signal, determination of the dose, and error propagation.
Subject(s)
Dental Enamel/radiation effects , Electron Spin Resonance Spectroscopy/methods , Radiometry/methods , Dental Enamel/chemistry , Electron Spin Resonance Spectroscopy/statistics & numerical data , Evaluation Studies as Topic , Free Radicals/analysis , Free Radicals/radiation effects , Humans , Laboratories , Radiation Tolerance , Radiometry/statistics & numerical dataABSTRACT
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 gamma-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 Earth's surface, thus raising the question about the possible effect of solar irradiation on dating and dosimetry.
