Update of the BIPM.RI(II)-K1.Rn-222 comparison of activity measurements for the radionuclide 222Rn to include the LNE?LNHB, France

In 2007, the Laboratoire national de metrologie et d'essais–Laboratoire national Henri Becquerel (LNE–LNHB), France submitted a sample of known activity of 222Rn to the International Reference System (SIR) for comparison. The value of the activity submitted was about 90 kBq. This key comparison result joins that of Switzerland and Germany in the key comparison database that now contains three results, identifier BIPM.RI(II)-K1.Rn-222. Consequently, the KCRV has been updated and the degrees of equivalence with the KCRV have been evaluated. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCRI Section II, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).