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Radiation Protection Dosimetry Advance Access originally published online on March 29, 2005
Radiation Protection Dosimetry 2005 113(4):403-407; doi:10.1093/rpd/nch482
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Can default ICRP f1 values be applied to determine radiation dose from the intake of diet-incorporated thorium?

V. Höllriegl*, W. B. Li, U. Oeh, M. Röhmuß and P. Roth

GSF—National Research Center for Environment and Health, Institute of Radiation Protection, Ingolstädter Landstrasse 1, D-85764 Neuherberg, Germany

* Corresponding author: vera.hoellriegl{at}gsf.de

Received December 22, 2004, amended February 21, 2005, accepted March 1, 2005

Data on the daily urinary excretion of thorium (Th) was obtained from 15 non-exposed adult German subjects. A radiochemical neutron activation analysis method was developed and standardised especially for this purpose. The daily urinary excretion of 232Th was found to be in the range 1.9–14.9 µBq d–1 with a mean (±SD) value of 6.5 (±4.3) µBq d–1. Using this excretion value and reported data on dietary intake of Th for a similar German population, the gastrointestinal absorption factor (f1 value) proposed by the International Commission on Radiological Protection (ICRP) was tested. Although the daily excretion of 232Th observed in the present study was comparable to some of the currently reported values in certain other countries, it was higher than the excretion value calculated by applying the biokinetic model of Th proposed by ICRP for the dietary intake values. The study showed that the default ICRP values of the f1 factor for diet-incorporated Th may not be applicable.


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W. B. Li, W. Wahl, U. Oeh, V. Hollriegl, and P. Roth
Biokinetic modelling of natural thorium in humans by ingestion
Radiat Prot Dosimetry, July 1, 2007; 125(1-4): 500 - 505.
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