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Intercomparison of 123I solution sources in UK hospitals, 2000.

Baker, M; Woods, M J (2000) Intercomparison of 123I solution sources in UK hospitals, 2000. NPL Report. CIRM 38

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Following concerns expressed within the nuclear medicine field about the accuracy of measurements of 123 I using radionuclide calibrators, an intercomparison was conducted in 1996 for this particular radionuclide. That exercise highlighted the fact that small variations in wall thickness of either the sample container or the calibrator could generate large variations in response for typical radionuclide calibrators, due to the significant quantity of low energy photons emitted from 123 I.
To assess whether the level of measurement performance for 123 I has improved as a result of the recommendations made in the previous intercomparison report, a repeat intercomparison exercise was conducted between the National Physical Laboratory (NPL), AEA Technology plc (AEA), Nycomed-Amersham (NA) and the UK hospital physics community.
A total of 318 results were reported for this exercise, of which only about 50 % were within the accepted limit of ± 10 % from the true value. A tendency to underestimate the activity for measurements made in the P6 vials and a significant high bias for syringe results were revealed. Possible sources of errors that explained the inaccuracy of the reported values were also identified.
The exercise has revealed that the accuracy of 123 I measurements in the UK hospitals has not improved significantly since the last intercomparison.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CIRM 38
Subjects: Ionising Radiation
Ionising Radiation > Radioactivity
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/1608

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