CIPM MRA COMPARISON REPORTS

KEY COMPARISON

BIPM.RI(II)-K1.Ba-133 (2026 update)

Activity of radionuclide Ba-133

R. Coulon , C. Michotte , M. Nonis , S. Courte , V. Gressier , J. Sochorová , P. Auerbach , C.J. Da Silva , M.A. da S. Leobino , R.L. da Silva ... , J. Rangel , J.U. Delgado , E.M. Oliveira , O.L. Trindade

Citation R. Coulon et al 2026 CIPM MRA Comparison reports 06014

https://doi.org/10.59161/LNFI4711

Authors

Romain Coulon

https://orcid.org/0000-0001-9851-0890 Bureau International des Poids et Mesures (BIPM) BIPM - International Organization

Carine Michotte

https://orcid.org/0009-0008-2133-6765 Bureau International des Poids et Mesures (BIPM) BIPM - International Organization

Manuel Nonis Bureau International des Poids et Mesures (BIPM) BIPM - International Organization

Sammy Courte Bureau International des Poids et Mesures (BIPM) BIPM - International Organization

Vincent Gressier

https://orcid.org/0000-0001-5826-1666 Bureau International des Poids et Mesures (BIPM) BIPM - International Organization

Jana Sochorová Czech Metrology Institute (CMI) Czechia

Pavel Auerbach Czech Metrology Institute (CMI) Czechia

Carlo J. Da Silva

https://orcid.org/0000-0003-4381-2730 Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Monica A. da S. Leobino

https://orcid.org/0009-0000-6999-0856 Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Ronaldo L. da Silva Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Johnny Rangel

https://orcid.org/0009-0004-3583-976X Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

José U. Delgado Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Estela M. Oliveira Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Octávio L. Trindade Laboratorio Nacional de Metrologia das Radiacoes Ionizantes, IRD (LNMRI/IRD) Brazil

Abstract

Since 1977, 23 laboratories have submitted 47 samples of ¹³³Ba to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Ba-133. Recently, the CMI (Czechia) and the LNMRI-IRD (Brazil) participated in the comparison and the key comparison reference value (KCRV) has been updated. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the APMP.RI(II)-K2.Ba-133 comparison and the updated KCRV have been calculated and the results are given in the form of a table. A graphical representation is also given.

Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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