Benchmarking calibration for low level gamma spectrometry
Objective :
The increased interest in measuring low levels of
radionuclides in the environment has resulted in
advances in detector technology, which, in turn,
require complex calibration techniques. An
accurate determination of detection efficiency is
essential to improving the quality of analytical
data and the estimation of the total measurement
uncertainty. Environmental laboratories are
typically interested in calibration methods for a
wide range of sample matrices and geometries.
Monte Carlo simulation, involving model calibration
using a small number of well-selected,
low-uncertainty point or volume standard sources,
is a cost-effective alternative to the purely experimental
approach, which requires multiple volume
standards. Additionally, well-calibrated numerical
models allow the optimization of measurement
geometries and the improvement of data accuracy
through the estimation of self-attenuation and
coincidence corrections.
MEL scientists are working to coordinate the
development of validated calibration methods
relying on combined experimental and modelling
approaches and to establish traceability of results
through comprehensive quantification of measurement
uncertainties associated with low level
gamma spectrometric analyses of environmental
samples.
The project involves 12 participants from 11 countries
and extends over the period 2008–2012.
The results of the study are expected to be
published in an IAEA Technical Report and in the
international scientific literature. It is expected that
this study will allow Member State laboratories
to increase the reliability of their environmental
radioactivity data.
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