to BIPM.org
CIPM MRA PARTICIPANTS
All data listed in the KCDB have been reviewed and approved within the CIPM Mutual Recognition Arrangement
Menu
Login
CIPM MRA PARTICIPANTS
Calibration and Measurement Capabilities – CMCs
?
Added keywords act as an additional filter. Keywords separated by a space will be treated by the logical function AND automatically. You may also use OR. Keyword searches also find close matches. Placing quotation marks (") before and after the search word, e.g. "word", will allow for exact matches.

In case of multiple search, please use ADVANCED SEARCH.
Advanced search
Key and supplementary comparisons
?
Added keywords act as an additional filter. Keywords separated by a space will be treated by the logical function AND automatically. You may also use OR. Keyword searches also find close matches. Placing quotation marks (") before and after the search word, e.g. "word", will allow for exact matches.

In case of multiple search, please use ADVANCED SEARCH.
Advanced search
News
28 SEPTEMBER 2026
Key Comparison of Air Kerma for Low-Energy X-Rays – BIPM
The latest results of BIPM.RI(I)-K2 have been published in the KCDB, including results obtained with Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti (ENEA-INMRI), Italy. This is a comparison of the measurement of air kerma air kerma for low energy x-rays, in the field of Ionizing Radiation, in which 18 state economies have participated.
28 SEPTEMBER 2026
Key comparison for abundance of ozone in dry air
Results issued from the continuous BIPM.QM-K1 comparison have recently been published in the KCDB, including the results obtained with NPLI, India in February 2025. This comparison underpins the determination of the concentration of ozone in air, a current health issue linked to air pollution.
25 SEPTEMBER 2026
Key Comparison of air kerma in mammography X-ray beams – APMP
The results of the key comparison APMP.RI(I)-K7 have been published in the KCDB. This is a comparison of air kerma in mammography X-Ray beams in the field of dosimetry in Ionizing radiation, linked to BIPM.RI(I)-K7 in which 4 state economies and the International Atomic Energy Agency participated. 
25 SEPTEMBER 2026
Key Comparison of Air Kerma in mammography X-Ray beams – BIPM
The latest results of BIPM.RI(I)-K7 have been published in the KCDB, including results obtained with Istituto Nazionale di Metrologia delle Radiazioni Ionizzanti (ENEA-INMRI), Italy. This is a comparison of the measurement of air kerma in the mammography x-rays ranging from 25 kV to 35 kV, in the field of Ionizing Radiation, in which 13 state economies have participated.
See all news
Statistics
AFRIMETS APMP COOMET EURAMET GULFMET SIM
No content
Currently in the KCDB there are
262 CIPM MRA participants
1284 key comparisons
26414 CMCs
780 supplementary comparisons