The IAEA Proficiency Test on Evaluation of Methods for 90Sr Measurement in a Mineral Matrix; Preliminary Evaluation of Sources of ... View Full Text


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Article Info

DATE

2000-12

AUTHORS

P. De Regge, Z. Radecki, J. Moreno, K. Burns, G. Kis-Benedek, R. Bojanowski

ABSTRACT

The results from numerous intercomparison exercises and proficiency tests indicate that the measurement of 90Sr in solid environmental matrices poses a problem to many analysts. The causes of the observed scatter of analytical results are not well understood and therefore difficult to remedy. In order to assess the effect of various analytical operations and measurement routines on the quality of the 90Sr data, the IAEA's Analytical Control Services have organised a proficiency test using a mineral sample spiked at three different levels with known amounts of 90Sr. This proficiency test generated considerable interest from the radioanalytical community as a total of 192 sets of samples were distributed to 158 radioanalytical laboratories world-wide. The reported data were evaluated with respect to their relative bias against the reference value and with respect to their reported overall uncertainty. The major sources of bias leading to overestimated values are ineffective purification procedures, high background values and a lack of statistical control over background values. The major sources of bias leading to an underestimation are overestimated recovery factors in part due to failure to correct for stable Sr in the sample and possibly failure to correct for quenching in liquid scintillation counting. Preliminary results for a small randomly selected group of laboratories are presented. More... »

PAGES

511-519

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1006772402444

DOI

http://dx.doi.org/10.1023/a:1006772402444

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047152211


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