Ultra Low-Level gamma-ray Spectrometry of Human Bone Samples
Following the use of in-vivo measurements of (210)Pb to retrospectively estimate radon exposure, interest has been expressed in the use of in-vivo measurements of (208)Tl to estimate thorium intake. To aid with calibration and to determine the optimum part of the body on which in-vivo measurements should be made, the distribution of (208)Tl and (228)Ac amongst different human bones was measured in the underground laboratory HADES. The (208)Tl activity was determined by the 2614.7 keV and the 583.1 keV gamma-ray lines. The (228)Ac activity was determined by the 911.1 keV and the 964.6 keV gamma -ray lines. The background under those peaks when measured on the 106% relative efficiency coaxial HPGe detector in HADES is of the order of I d-l. This allows the determination of activity levels above 1.5 mBq for both radionuclides for a typical 10 9 bone sample and for a measuring time of 1 week.
Bibliographic Reference: An oral report given at: the 1st European Workshop On the Analysis of Thorium in Workplace Materials. Organised by: SCR.Cen, Institute for Reference Materials and Measurements and HSL. Held in: SCR-CEN 27-28 March, 2001
Record Number: 200013401 / Last updated on: 2001-06-27
Original language: en
Available languages: en