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Longman Dictionary of Contemporary English
becquerel
noun
EXAMPLES FROM CORPUS
▪ Children with more than 60 becquerels of radioactivity per kilo of bodyweight are thought to be at risk from disease.
▪ It had a caesium 137 concentration of only 4 becquerels per kilogram.
▪ One becquerel is equal to one radioactive decay per second.
▪ Readings showed levels of 56,000 becquerels per kilogram in vegetation and soil samples.
The Collaborative International Dictionary
Wiktionary
becquerel

n. In the International System of Units, the derived unit of radioactive activity; the activity of a quantity of radioactive material in which one nucleus decays per second. Symbol: Bq

Wikipedia
Becquerel

The becquerel (symbol Bq) (pronounced: ) 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. The becquerel is named after Henri Becquerel, who shared a Nobel Prize with Pierre Curie and Marie Curie in 1903 for their work in discovering radioactivity.

Becquerel (lunar crater)

Becquerel is a lunar crater that lies in the northern hemisphere on the far side of the Moon. This is an ancient and heavily worn formation that is now little more than an irregular depression in the surface. The outer rim has been worn and reshaped until it forms a rugged, mountainous region around the flatter interior.

The most notable of the formations on the rim is Becquerel X, which is part of a double crater along the northwestern rim. There is a short valley paralleling the southwestern rim, most likely formed by the merging of several small craters. The interior floor of Becquerel is relatively flat, but with rough sections and several tiny craterlets marking the surface. There is a dark patch (low albedo) on the floor near the southern rim.

To the west of Becquerel are H. G. Wells and Tesla, to the north is Segers, to the northeast is Bridgman, and to the south is Van Maanen.

The crater's name was adopted by the IAU in 1970.

Becquerel (disambiguation)

The Becquerel (Bq) is a unit of radioactivity or average frequency, named after Henri Becquerel

Becquerel may also refer to:

  • 6914 Becquerel, asteroid
  • Becquerel (lunar crater)
  • Becquerel (Martian crater)
  • Becquerel, a dog in Homestuck

Members of the Becquerel family of scientists include:

  • Antoine César Becquerel (1788-1878), pioneer in the study of electric and luminescent phenomena, father of Edmond

:* Louis Alfred Becquerel (1814-1862), French physicist and medical researcher, son of Antoine Cesar, brother of Edmond

:* Alexandre-Edmond Becquerel (known as Edmond, 1820-1891), studied the solar spectrum, magnetism, electricity, and optics. Discovered photovoltaic effect. Son of Antoine Cesar, father of Henri.

::* Henri Becquerel (1852-1908), discoverer of radioactivity, son of Edmond, father of Jean

:::* Jean Becquerel (1878-1953), worked on the optical and magnetic properties of crystals, son of Henri

Becquerel (Martian crater)

Becquerel is a 167 km-diameter crater at 22.1°N, 352.0°E on Mars, in Arabia Terra in Oxia Palus quadrangle. It is named after Antoine H. Becquerel.

Photographs by the Mars Global Surveyor revealed layered sedimentary rocks in the crater. The layers appear to be only a few meters thick and show little variations in thickness. Recent studies with HiRISE have determined the exact thickness of the layers. The 66 layers measured showed one group of layers to average and another group to average in thickness. Patterns like this are usually produced on Earth through the effects of water; volcanic deposits would not produce ash or laval flows of such regular thickness and in any event there are no nearby volcanic vents.

There are cyclic variations in the thickness of the exposed sedimentary layers, possibly indicating cyclic variations in environmental conditions while the sediment was being laid down. Most of the layers are parallel to each other, suggesting they formed by vertical settling, but a few are cross-bedded, indicating that at the time that the layers were deposited the sediment was transported along the ground surface by wind or water. The sedimentary material appears to be easily eroded and active wind erosion may be continuing to the current day.

Some parts of Becquerel show light-toned layers. Light-toned rocks on Mars have been associated with hydrated minerals like sulfates. The Mars Rover Opportunity examined such layers close-up with several instruments. Scientists are excited about finding hydrated minerals such as sulfates and clays on Mars because they are usually formed in the presence of water. Places that contain clays and/or other hydrated minerals would be good places to look for evidence of life.

Many craters once contained lakes. Because some crater floors show deltas, we know that water had to be present for some time. Dozens of deltas have been spotted on Mars. Deltas form when sediment is washed in from a stream entering a quiet body of water. It takes a bit of time to form a delta, so the presence of a delta is exciting; it means water was there for a time, maybe for many years. Primitive organisms may have developed in such lakes; hence, some craters may be prime targets for the search for evidence of life on the Red Planet.

Image:Wikibecquerel.jpg|Becquerel Crater with parts labeled, as seen by CTX camera (on Mars Reconnaissance Orbiter). Image:Wikibecquerelnemound.jpg|Layers in Becquerel Crater mound, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image. Image:Wikibecquerelsmound.jpg|Layers in southern portion of Becquerel Crater mound, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of a previous image.

Image:Periodic Layering in Becquerel Crater, Mars .jpg|Closeup of the periodic ayering in Becquerel Crater Image:Becquerel Crater layers.JPG|Becquerel Crater layers with a fault, as seen by HiRISE. Image:Marscratermounds.jpg|Mounds in craters showing layers are formed by the erosion of layers that were deposited after the impact. Image:Layers in Monument Valley.jpg|Layers in Monument Valley on Earth, for comparison. Image:Quadrângulo de Oxia Palus.JPG|Quadrangle map of Oxia Palus labeled with major features. This quadrangle contains many collapsed areas of Chaos and many outflow channels (old river valleys). Becquerel is in the upper right. Image:Tilted and Layered Bedrock Blocks in a Large Crater inside Becquerel Crater.jpg|There is a crater nearly 50 kilometers in diameter inside the 167-kilometer Becquerel Crater. This image shows layered blocks tilted at high angles, diverse color and textures and dark dunes. Some of the bedrock may have originated at great depths, uplifted first by Becquerel Crater and later by the unnamed 50-kilometer crater. Very complex geology here.

Usage examples of "becquerel".

The Becquerels were set within three-inch tripods, whose feet I had equipped with vacuum rings to enable them to hold fast to the rock.

In 1903 the Curies and Becquerel were jointly awarded the Nobel Prize in physics.

It began in 1896 when Henri Becquerel in Paris carelessly left a packet of uranium salts on a wrapped photographic plate in a drawer.

Harding, after mature consideration, decided to manufacture a very simple battery, resembling as nearly as possible that invented by Becquerel in 1820, and in which zinc only is employed.

First of all I took out the two Becquerel ray-condensers that I had bought in Sydney.

First of all I took out the two Becquerel ray-condensers that I had boughtin Sydney.

Becquerel had shown that by placing some uranium salt on a photographic plate, covered with black paper, the plate would be affected as if light had fallen on it.