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Natural radionuclides in human hair.
In: Handbook of hair in health and disease. Wageningen: Wageningen Academic Publishers, 2012. 317-330
Naturallyoccurringradionuclides ofterrestrialorigin,suchas 238U,235U, 226Ra,210poand 21OPb, are present to various degrees in all environmental media, including the human body. Like other pollutants, many natural radioactive substances also accumulate in hair. In this article, the transfer to human scalp hair and typical concentrations in hair are presented for some natural radionuclides. Uranium is a primordial radioactive element ubiquitously present in the Earth's crust. Natural uranium consists of a mixture of three radioactive isotopes: 238U (99.2745% by mass), 235U (0.7200%) and 234U (0.0054%). All three isotopes are a-emitters with very long half-lives. In addition to uranium isotopes, 226Ra, 21Opo arid 210Pb are taken into account. They occur widely in the natqral environment as they are part of the 238U decay chains. All these radionuclides are transferred from the environment to the human body via inhalation and the ingestion of foodstuffs and water. The intake of natural radionuclides varies depending on the diet and residential location. Consequently. the concentrations in human hair vary greatly. The concentrations of uranium, 210Pb and 210po in human hair have been observed to vary between <0.5-140,000 ng/g, 0.7-10 mBq/g and 0.4-59.3 mBq/g, respectively. Natural variation in the transfer of natural radionuclides into hair complicates the use ofhair as an accurate bioindicator.
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Publication type Article: Edited volume or book chapter
Editors Preddy, V.R.*
Keywords uranium; radium; polonium; lead; biokinetic models; internal doses
Book Volume Title Handbook of hair in health and disease
Quellenangaben Pages: 317-330
Publisher Wageningen Academic Publishers
Publishing Place Wageningen