Browse Definitions :


The becquerel is the derived unit of radioactivity in the International System of Units ( SI ), symbolized Bq and equal to one disintegration or nuclear transformation per second. Reduced to base SI units, 1 Bq = 1 s -1 . The becquerel is named after Antoine Henri Becquerel, the French physicist credited with the discovery of radioactivity. In the 1970s, the becquerel replaced the curie as the standard unit of radioactivity.

The becquerel is a small unit. In practical situations, radioactivity is often quantified in kilobecqerels (kBq) or megabecquerels (MBq), where:

1 kBq = 1000 Bq = 10 3 Bq
1 MBq = 1000 kBq = 1,000,000 Bq = 10 6 Bq

Thus, 1 kBq is the equivalent of 1000 disintegrations per second (10 3 s -1 ), or an average of one disintegration per millisecond, and 1 MBq is the equivalent of 1,000,000 disintegrations per second (10 6 s -1 ), or an average of one disintegration per microsecond.

Also see International System of Units ( SI ).

This was last updated in December 2005



  • cyber attack

    A cyber attack is any attempt to gain unauthorized access to a computer, computing system or computer network with the intent to ...

  • backdoor (computing)

    A backdoor is a means to access a computer system or encrypted data that bypasses the system's customary security mechanisms.

  • post-quantum cryptography

    Post-quantum cryptography, also called quantum encryption, is the development of cryptographic systems for classical computers ...



  • risk mitigation

    Risk mitigation is a strategy to prepare for and lessen the effects of threats faced by a business.

  • call tree

    A call tree is a layered hierarchical communication model that is used to notify specific individuals of an event and coordinate ...

  • Disaster Recovery as a Service (DRaaS)

    Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...