(redirected from Becquerels)
Also found in: Dictionary, Thesaurus, Encyclopedia.


 (Bq) [bek-ĕ-rel´]
the SI unit of radioactivity, defined as the quantity of a radionuclide that undergoes one decay per second; one curie equals 3.7 × 1010 becquerels.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Antoine H., French physicist and Nobel laureate, 1852-1908. See: becquerel, Becquerel rays.

bec·que·rel (Bq),

The SI unit of measurement of radioactivity, equal to 1 disintegration per second; 1 Bq = 0.027 × 10-9 Ci.
[A. H. Becquerel]
Farlex Partner Medical Dictionary © Farlex 2012


The International System (SI) unit for measuring radioactivity based on radioactive decay, equal to 1 disintegration (nuclear transition)/sec. Named after Antoine-Henri Becquerel, French Nobel Laureate, who discoverered of radioactivity. 

1 Bq = 3.70 x 1010 Ci (Curie, which it supersedes)
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


The SI unit of measurement of radioactivity, equal to 1 disintegration per second; 1 Bq = 0.027 × 10-9 Ci.
See also: absorption
[A. H. Becquerel]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A unit of the strength of radioactivity from a particular source. A Becquerel is defined as one nuclear disintegration per second.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


Antoine H., French physicist and Nobel laureate, 1852-1908.
becquerel - the SI unit of measurement of radioactivity.
Becquerel rays - obsolete term for radiation given off by uranium and other radioactive substances.
Medical Eponyms © Farlex 2012
References in periodicals archive ?
A becquerel is the International System of Units (SI) used to measure radioactivity.
In Fukushima Prefecture, the straw was found to contain up to 97,000 becquerels of radioactive cesium per kg.
Just 200 becquerels of the naturally occurring gas is the safe level.
In March 2013, TEPCO, the Japanese utility that operates the tsunami-damaged nuclear power plant, said it detected a record 740,000 becquerels per kilogram of radioactive caesium in a fish caught close to the plant, which was 7,400 times the government limit for safe human consumption.
The legal standard for strontium emissions is 30 becquerels per liter.
The level of becquerels was 11 times higher than the previous day's reading and 2.3 times higher than 59,000 becquerels detected in water sampled at the same location on Tuesday, the report added.
The water that leaked has undergone the cesium-reduction process, but is believed to still contain about 2,000 becquerels of cesium, and was due to be desalinated.
When tested on contaminated soil in Fukushima Prefecture, the levels of radioactive cesium in the soil decreased from 67,300 becquerels per kilogram to 29 becquerels.
On Wednesday, the prefectural tests detected 630 becquerels per kilogram of
Japan's biggest utility estimated around 4,720 trillion becquerels of cesium-137 and iodine-131 was released into the Pacific Ocean between March 21 and April 30, but researchers at the Japan Atomic Energy Agency (JAEA) put the amount 15,000 trillion becquerels, or terabecquerels.
The ministry detected 82,000 becquerels of radioactive cesium, 164 times the limit under the food sanitation law, in ''kukitachina'' leaves from Motomiya on Monday, along with 15,000 becquerels of radioactive iodine, which is more than seven times the limit.
There are 597 properties above the acceptable level of 200 becquerels per cubic metre, the Radiological Protection Institute of Ireland reported.