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Abstract

As part of an inter-comparison to resolve discrepancies between Accelerator Mass Spectrometry results and radiometric results, the (26)AI activity in four meteorite samples was measured using ultra low-level gamma-ray spectrometry in the underground laboratory HADES. Although reference sources were used, extensive use was made of computer modelling to determine corrections for absorption, coincidence summing between gamma rays in the decays and annihilation radiation following positron emission. Directional correlation corrections were also taken into account. The limiting uncertainties in these measurements arose from counting statistics of 5 to 9%. Some computer modelling was undertaken to determine optimum geometry for this type of inter-comparison involving gamma-ray spectrometry.

Additional information

Authors: JOHNSTON P.N, EC-JRM-IRMM, Institute for Reference Materials and Measurements, Geel (BE);HULT M, EC-JRM-IRMM, Institute for Reference Materials and Measurements, Geel (BE);ALTZITZOGLOU T, EC-JRM-IRMM, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: An oral report given at: ICRM 2001, 13th International Conference on Radionuclide Metrology and its Applications. Organised by: ICRM and PTB. Held in: Braunschweig (DE), 14-18 May, 2001
Record Number: 200013491 / Last updated on: 2001-07-24
Category: PUBLICATION
Original language: en
Available languages: en