Bones and Teeth Hydroxyapatite

The uranium accumulation of tooth enamel is negligibly small while it can be appreciable for dentine. Hence, the efforts to determine the y-ray dose from the external dentine to enamel must be made to assess the equivalent dose, ED, considering the linear uranium uptake and early as well as late uranium uptake using polynomial formula for some fossils. Laboratory experiments indicated that fresh enamel did not accumulate uranium rapidly but dentine did.8182 The author argue that fitting to a saturation curve rather than a meaningless poly-nominal should be made in a model calculation of uranium-uptake.1 

Tooth enamels from Qaryatal-fau in south of Saudi Arabia were dated giving an age of about 2300 + 70 and 1650 + 190 years, while the radiocarbon age was 2130 55 and 1750 150 years, respectively.85 There are many examples of ESR dating of tooth enamel in paleo-anthropology in specialist journals.86,87 

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The inorganic part of bones and teeth, hydroxyapatite, Caio(P04)6(OH)2, contains some amount of carbonate. After irradiation an anisotropic ESR signal with g l = 1.996 and gj = 2.002 appears assigned to the C02 anion radical [4, 71], The signal is stable even when the bone is boiled. The ESR signals appearing after irradiation of fish bones disappear shortly after the radiation processing, however. 

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