Liaison: Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO)


Formal relationship

BIPM-CTBTO Practical Arrangement

Links between the BIPM and the CTBTO

  • The BIPM participates at selected CTBTO events and vice versa.


The CTBTO was created to carry out the necessary preparations for the effective implementation of the Comprehensive Nuclear-Test-Ban Treaty (CTBT), including in particular of the Treaty’s verification regime at entry into force of the Treaty.

The BIPM assists the CTBTO in its role to provide its States Signatories with data and products of the highest quality standard including reaching compatibility and adherence to the International System of Units (Système International d'Unités, the SI), metrological traceability and measurement uncertainty. The CTBTO assists the BIPM in its role of coordinating the development and validation of Calibration and Measurement Capabilities (CMCs) for measurements in the field of low-frequency sound and vibration as well as radionuclide particulates and gases.



Dr Vincent Gressier

Ionizing Radiation Department

Asset Publisher