Meaning of becquerel in English:


Pronunciation /ˈbɛkərɛl/


(also Bq)
  • The SI unit of radioactivity, corresponding to one disintegration per second.

    ‘This box, designed to monitor gamma radiation, in itself contained enough strontium 90 to emit 500,000 becquerels of radioactivity.’
    • ‘Radon abundance is measured in terms of its radioactivity in becquerels per cubic metre of radon in air, written Bq m 3. 222 Rn, commonly referred to simply as radon, is the most discussed isotope.’
    • ‘The concentrations of tritium in leachate at the site sampled in March this year reached 14,230 becquerels per litre, compared to the 290 becquerels per litre reported in 1996.’
    • ‘One becquerel means the disintegration of one nucleus (of the radium atom) per second.’
    • ‘The becquerel is a unit of radioactivity and corresponds to one radioactive disintegration per second.’
    • ‘Information on demographic and lifestyle variables was compiled for each person by using a common format, and radon measurements were expressed in becquerels (radon disintegrations per second) per cubic metre of household air.’
    • ‘‘This analysis did confirm the existence of the contamination but at very low levels - up to 10 becquerels per kilogram - in an area not normally accessed by members of the public,’ said a spokeswoman for Sepa.’
    • ‘The analyses also found cobalt - 60 values of up to 40 becquerels per kilogram, and pollution from cesium - 137 in concentrations of up to 9,400 becquerels per kilogram.’
    • ‘One sample taken in Glencree village recorded a reading of almost six times the safety limit of 1,000 becquerels per litre.’
    • ‘The International System of Units measure of activity is becquerels per cubic meter (Bq/m).’
    • ‘The rate of decay in a given mass of the radionuclide is measured in units called becquerels, where 1 Bq equals one transformation per second.’
    • ‘One house had a concentration of 6,184 becquerels per cubic metre more than 30 times above the national reference level of 200 Bq/m3.’
    • ‘Of that number, 121 had radon concentrations above the national reference level and nine had very high radon concentrations of more than 1000 becquerels per cubic metre.’
    • ‘The department began remedial work in early 2000, soon after the first phase of the survey became available, and the work is ongoing in the remaining 690 schools in where radon concentrations exceed 200 becquerels per cubic metre.’
    • ‘Schools in the county had the highest average reading in the country of 153 becquerels, and one Kerry school had one of the highest readings in Ireland with more than 3800 becquerels per cubic metre being detected.’
    • ‘At 50000 becquerels per cubic metre, this level of Radon gas was 250 times the recommended safe limit of 200 becquerels per cubic metre, he pointed out.’
    • ‘Thirty of them were found to be above the high radon ‘reference level’, which is 200 becquerels per cubic metre of air.’
    • ‘The NRPB has set an ‘action level’ of 200 becquerels where remedial measures should take place and the average radon level in British homes is 20 Bq/m3.’
    • ‘The Sligo house we referred to above had a reading of 5,508 becquerels.’
    • ‘Swabs taken from the tanks now show monthly levels of 70 becquerels of caesium 137.’


Late 19th century named after A.-H. Becquerel (see Becquerel, Antoine-Henri).