Share
VIDEOS 1 TO 50
What actually does Becquerel mean?
What actually does Becquerel mean?
Published: 2015/09/29
Channel: GRS | Deutschland
Radioactivity ~ Henri Becquerel, Marie & Pierre Curie
Radioactivity ~ Henri Becquerel, Marie & Pierre Curie
Published: 2013/04/29
Channel: Dap Dapple
Radioaktivität Becquerel und Curie Meilensteine der Naturwissenschaft und Technik.
Radioaktivität Becquerel und Curie Meilensteine der Naturwissenschaft und Technik.
Published: 2012/11/07
Channel: SuperAtomus
Was ist eigentlich ein Becquerel?
Was ist eigentlich ein Becquerel?
Published: 2015/08/04
Channel: GRS | Deutschland
Henri Becquerel
Henri Becquerel's Contribution to Radioactivity
Published: 2014/03/20
Channel: Tabitha Whatley-Moose
La Radiactividad - Marie Curie Pierre Curie Henri Becquerel - Física
La Radiactividad - Marie Curie Pierre Curie Henri Becquerel - Física
Published: 2012/07/14
Channel: Moisés López Caeiro
09 2015_04_17 Physik, Kernphysik 06, Begriffe klären, Halbwertszeit, Aktivität in Becquerel
09 2015_04_17 Physik, Kernphysik 06, Begriffe klären, Halbwertszeit, Aktivität in Becquerel
Published: 2015/04/17
Channel: Mathematik-, Physik-, Chemie- Unterrichtsmitschnitte (www.xx-yy.de)
Henri Becquerel
Henri Becquerel
Published: 2013/12/24
Channel: simple science
Atomphysik - Becquerel, Curie, Rutherford, Thomson, Röntgen, Hahn und Oppenheimer
Atomphysik - Becquerel, Curie, Rutherford, Thomson, Röntgen, Hahn und Oppenheimer
Published: 2016/07/31
Channel: Lehrerschmidt
Descoberta da Radioatividade - Roentgen, Becquerel e Marie Curie
Descoberta da Radioatividade - Roentgen, Becquerel e Marie Curie
Published: 2015/07/08
Channel: ADVEST
hearthstone Becquerel FUNNY MOMENTS vol 1
hearthstone Becquerel FUNNY MOMENTS vol 1
Published: 2017/04/17
Channel: Becquerel Tv
Henry Becquerel
Henry Becquerel
Published: 2011/06/06
Channel: Vero Morejon
Aula de Química - O experimento de Becquerel
Aula de Química - O experimento de Becquerel
Published: 2014/05/22
Channel: Aula de Química com Prof. Alex Dias
[Histoire des sciences] La découverte de la radioactivité
[Histoire des sciences] La découverte de la radioactivité
Published: 2014/09/15
Channel: CEA Recherche
Tour Becquerel
Tour Becquerel
Published: 2017/05/08
Channel: Wochenspiegellive
Pontociência -  O experimento de Becquerel
Pontociência - O experimento de Becquerel
Published: 2010/07/21
Channel: pontociencia
London 2016 Proud to BE Becquerel
London 2016 Proud to BE Becquerel
Published: 2016/04/12
Channel: Instituto Becquerel
Marie & Pierre Curie, Henri Becquerel. The Discovery of Radioactivity and Radioactive Elements.
Marie & Pierre Curie, Henri Becquerel. The Discovery of Radioactivity and Radioactive Elements.
Published: 2016/03/19
Channel: 20th Century Time Machine
Nuclear Physics 2 Properties of Becquerel Rays
Nuclear Physics 2 Properties of Becquerel Rays
Published: 2014/04/05
Channel: Brendon Beard
Daguerrotipo | Becquerel | Primera Parte
Daguerrotipo | Becquerel | Primera Parte
Published: 2013/02/06
Channel: simone choulle
Curie, Becquerel, and Radioactivity
Curie, Becquerel, and Radioactivity
Published: 2012/12/21
Channel: Michaela Roberts
Becquerel Meaning
Becquerel Meaning
Published: 2015/04/13
Channel: SDictionary
Henri Becquerel
Henri Becquerel
Published: 2013/11/20
Channel: Cole Avery
Experimento de Becquerel 2ª A
Experimento de Becquerel 2ª A
Published: 2013/11/01
Channel: Wesley Henrique
Clip du Centre Henri-Becquerel
Clip du Centre Henri-Becquerel
Published: 2017/06/02
Channel: Centre Henri-Becquerel
Inspiring Stories Everyday - Henri Becquerel
Inspiring Stories Everyday - Henri Becquerel
Published: 2014/03/01
Channel: Vikatan TV
Exposicion! Henry Becquerel... Experimento-Radioactividad.
Exposicion! Henry Becquerel... Experimento-Radioactividad.
Published: 2015/11/02
Channel: Armando Mequetrefe
Nature of Science Henri Becquerel
Nature of Science Henri Becquerel
Published: 2015/05/04
Channel: Daniela Seczon
GEN XVI | Proud To Be Becquerel
GEN XVI | Proud To Be Becquerel
Published: 2016/07/14
Channel: Instituto Becquerel
What is radioactivity?
What is radioactivity?
Published: 2013/04/28
Channel: LSGScience
Nuclear Physics 8: Properties of Becquerel Rays
Nuclear Physics 8: Properties of Becquerel Rays
Published: 2008/04/22
Channel: stevebd1
Dauntless Becquerel
Dauntless Becquerel
Published: 2017/03/08
Channel: Patty Carolino
Deon Nox - Becquerel (Laura Auer space rmx)
Deon Nox - Becquerel (Laura Auer space rmx)
Published: 2009/11/21
Channel: verygudveryguud
Coro Navidad Colegio Becquerel
Coro Navidad Colegio Becquerel
Published: 2016/12/28
Channel: Stefany Beltran
Daguerreotype | Erasing a dag | Polishing and buffing | Becquerel development
Daguerreotype | Erasing a dag | Polishing and buffing | Becquerel development
Published: 2014/09/19
Channel: simone choulle
- Henri Becquerel, Marie Curie und die Radioaktivität - 9
- Henri Becquerel, Marie Curie und die Radioaktivität - 9
Published: 2013/05/27
Channel: giorgiolesi
Experimento de Becquerel y los Curie "RADIACTIVIDAD"
Experimento de Becquerel y los Curie "RADIACTIVIDAD"
Published: 2014/06/22
Channel: Camila Fernandez
Becquerels - Weird Night (Official Music Video)
Becquerels - Weird Night (Official Music Video)
Published: 2012/12/21
Channel: BECQUERELS OFFICIAL
Astronomy Cast Ep. 373: Becquerel Experiment (Radiation)
Astronomy Cast Ep. 373: Becquerel Experiment (Radiation)
Published: 2015/04/06
Channel: Astronomy Cast
Física Nuclear - 2/6 - Propriedades dos raios de Becquerel
Física Nuclear - 2/6 - Propriedades dos raios de Becquerel
Published: 2011/10/31
Channel: Prof. Perdigão
Présentation du Centre Henri-Becquerel
Présentation du Centre Henri-Becquerel
Published: 2016/01/07
Channel: Centre Henri-Becquerel
antoine henri becquerel
antoine henri becquerel
Published: 2009/04/04
Channel: alex
Nuclear Physics 2 Properties of Becquerel Rays
Nuclear Physics 2 Properties of Becquerel Rays
Published: 2014/06/25
Channel: Carlos F. Banegas
Antoine Henri Becquerel e Georg Simon Ohm
Antoine Henri Becquerel e Georg Simon Ohm
Published: 2012/10/02
Channel: SuperKakareko
Chapter 06: Becquerel
Chapter 06: Becquerel
Published: 2014/03/26
Channel: Kelly Foster
Biografia de Antoine César Becquerel
Biografia de Antoine César Becquerel
Published: 2016/08/03
Channel: Biografías Contadas
How to pronounce Becquerel
How to pronounce Becquerel
Published: 2012/11/15
Channel: Emma Saying
Nuclear Physics 8: Properties of Becquerel Rays
Nuclear Physics 8: Properties of Becquerel Rays
Published: 2007/08/15
Channel: stevebd1
Rule of Nature goes with everything - Becquerel
Rule of Nature goes with everything - Becquerel's Prototyping
Published: 2014/11/24
Channel: Terrabalt
Flash Mob collège Henri Becquerel 2014 Shakira La La La (Dare)
Flash Mob collège Henri Becquerel 2014 Shakira La La La (Dare)
Published: 2014/07/03
Channel: leo ruesche
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Becquerel
Unit system SI derived unit
Unit of Radioactivity
Symbol Bq 
Named after Henri Becquerel
In SI base units s−1

The becquerel (symbol: Bq) is the SI derived unit of radioactivity. One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. The becquerel is therefore equivalent to an inverse second, s−1. The becquerel is named after Henri Becquerel, who shared a Nobel Prize in Physics with Pierre and Marie Curie in 1903 for their work in discovering radioactivity.[1]

Capitalization[edit]

As with every International System of Units (SI) unit named for a person, the first letter of its symbol is uppercase (Bq). However, when an SI unit is spelled out in English, it should always begin with a lowercase letter (becquerel)—except in a situation where any word in that position would be capitalized, such as at the beginning of a sentence or in material using title case.[2]

Definition[edit]

1 Bq = 1 s−1

A special name was introduced for the reciprocal second (s−1) to represent radioactivity to avoid potentially dangerous mistakes with prefixes. For example, 1 µs−1 could be taken to mean 106 disintegrations per second: 1·(10−6 s)−1 = 106 s−1.[3] Other names considered were hertz (Hz), a special name already in use for the reciprocal second, and fourier (Fr).[3] The hertz is now only used for periodic phenomena.[4] Whereas 1 Hz is 1 cycle per second, 1 Bq is 1 aperiodic radioactivity event per second.

The gray (Gy) and the becquerel (Bq) were introduced in 1975.[5] Between 1953 and 1975, absorbed dose was often measured in rads. Decay activity was measured in curies before 1946 and often in rutherfords between 1946[6] and 1975.

Prefixes[edit]

Like any SI unit, Bq can be prefixed; commonly used multiples are kBq (kilobecquerel, 103 Bq), MBq (megabecquerel, 106 Bq, equivalent to 1 rutherford), GBq (gigabecquerel, 109 Bq), TBq (terabecquerel, 1012 Bq), and PBq (petabecquerel, 1015 Bq). For practical applications, 1 Bq is a small unit; therefore, the prefixes are common. For example, the roughly 0.0169 g of potassium-40 present in a typical human body produces approximately 4,400 disintegrations per second or 4.4 kBq of activity.[7] The global inventory of carbon-14 is estimated to be 8.5×1018 Bq (8.5 EBq, 8.5 exabecquerel).[8] The nuclear explosion in Hiroshima (An explosion of 16 kt or 67 TJ) is estimated to have produced 8×1024 Bq (8 YBq, 8 yottabecquerel).[9]

Relationship to the curie[edit]

The becquerel succeeded the curie (Ci),[10] an older, non-SI unit of radioactivity based on the activity of 1 gram of radium-226. The curie is defined as 3.7·1010 s−1, or 37 GBq.[3]

Conversion factors:

1 Ci = 3.7×1010 Bq = 37 GBq
1 μCi = 37,000 Bq = 37 kBq
1 Bq = 2.7×10−11 Ci = 2.7×10−5 µCi
1 MBq = 0.027 mCi

Calculation of radioactivity[edit]

For a given mass (in grams) of an isotope with atomic mass (in g/mol) and a half-life of (in s), the amount of radioactivity can be calculated using:

With =6.022 141 79(30)×1023 mol−1, the Avogadro constant.

Since m/ma is the number of moles (n), the amount of radioactivity can be calculated by:

For instance, on average each gram of potassium contains 0.000117 gram of 40K (all other naturally occurring isotopes are stable) that has a of 1.277×109 years = 4.030×1016 s,[11] and has an atomic mass of 39.964 g/mol,[12] so the amount of radioactivity associated with a gram of potassium is 30 Bq.

Radiation-related quantities[edit]

Graphic showing relationships between radioactivity and detected ionizing radiation

The following table shows radiation quantities in SI and non-SI units.

Radiation related quantities view  talk  edit
Quantity Name Symbol Unit Year SI Quantity
Activity (A) curie Ci 3.7×1010 s−1 1953 3.7×1010 Bq
becquerel Bq s−1 1974 SI
rutherford Rd 106s−1 1946 1,000,000 Bq
Exposure (X) röntgen R esu / 0.001293g of air 1928 2.58×10−4 C/kg
Fluence (Φ) (reciprocal area) m−2 1962 SI
Absorbed dose (D) Erg erg·g−1 1950 1.0×10−4 Gy
rad rad 100 erg·g−1 1953 0.010 Gy
gray Gy J·kg−1 1974 SI
Dose equivalent (H) röntgen equivalent man rem 100 erg·g−1 1971 0.010 Sv
sievert Sv J·kg−1×WR 1977 SI

See also[edit]

References[edit]

  1. ^ "BIPM - Becquerel". BIPM. Retrieved 2012-10-24. 
  2. ^ "SI Brochure: The International System of Units (SI)". SI Brochure (8 ed.). BIPM. 2014. 
  3. ^ a b c Allisy, A. (1995), "From the curie to the becquerel", Metrologia, 32 (6): 467–479, Bibcode:1995Metro..31..467A, doi:10.1088/0026-1394/31/6/006 
  4. ^ "BIPM - Table 3". BIPM. Retrieved 2015-07-19. (d) The hertz is used only for periodic phenomena, and the becquerel is used only for stochastic processes in activity referred to a radionuclide. 
  5. ^ Harder, D (1976), "[The new radiologic units of measurement gray and becquerel (author's translation from the German original)]", Röntgen-Blätter, 29 (1): 49–52, PMID 1251122. 
  6. ^ Lind, SC (1946), "New units for the measurement of radioactivity", Science, 103 (2687): 761–762, Bibcode:1946Sci...103..761L, PMID 17836457, doi:10.1126/science.103.2687.761-a. 
  7. ^ Radioactive human body — Harvard University Natural Science Lecture Demonstrations - Accessed October 2013
  8. ^ G.R. Choppin, J.O.Liljenzin, J. Rydberg, "Radiochemistry and Nuclear Chemistry", 3rd edition, Butterworth-Heinemann, 2002. ISBN 978-0-7506-7463-8.
  9. ^ Michael J. Kennish, Pollution Impacts on Marine Biotic Communities , CRC Press, 1998, p. 74. ISBN 978-0-8493-8428-8.
  10. ^ It was adopted by the BIPM in 1975, see resolution 8 of the 15th CGPM meeting
  11. ^ "Table of Isotopes decay data". Lund University. 1990-06-01. Retrieved 2014-01-12. 
  12. ^ "Atomic Weights and Isotopic Compositions for All Elements". NIST. Retrieved 2014-01-12. 

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license