CO OZNACZA SŁOWO THERMAL NEUTRONS
Temperatura neutronu
Temperatura wykrywania neutronów, zwana również energią neutronową, wskazuje na energię kinetyczną wolnej neutronu, zazwyczaj podaną w elektronach. Używana jest temperatura terminu, ponieważ gorące, termiczne i zimne neutrony są moderowane w pożywce o określonej temperaturze. Następnie dystrybucja energii neutronowej zostaje przyjęta do rozkładu Maxwellian znanego z ruchu termicznego. W sensie jakościowym im wyższa temperatura, tym większa jest energia kinetyczna wolnego neutronu. Energia kinetyczna, prędkość i długość fali neutronu są powiązane przez relację De Broglie.
Definicja słowa thermal neutrons w słowniku
Definicja neutronów termicznych w słowniku to wolne neutrony, które są w przybliżeniu w równowadze termicznej z moderatorem. Mają rozkład prędkości podobnych do cząsteczek gazu w temperaturze moderatora. Dane dotyczące interakcji jądrowych są często podawane dla standardowych neutronów termicznych o prędkości 2200 metrów na sekundę, co jest w przybliżeniu najbardziej prawdopodobną prędkością w normalnych temperaturach laboratoryjnych.
KSIĄŻKI POWIĄZANE ZE SŁOWEM «THERMAL NEUTRONS»
Poznaj użycie słowa
thermal neutrons w następujących pozycjach bibliograficznych Książki powiązane ze słowem
thermal neutrons oraz krótkie ich fragmenty w celu przedstawienia kontekstu użycia w literaturze.
1
The Acquisition of Logging Data
Spatial distribution of thermal neutrons and capture gamma rays Consider a point
source of neutrons surrounded by an infinite homogeneous medium. High-
energy neutrons are continuously emitted in all directions. The lifetime of these ...
2
A Guidebook to Nuclear Reactors
So let us follow what happens when n thermal neutrons are absorbed by the fuel.
For the sake of argument, let us assume that the fuel is low-enrichment uranium.
The concepts will be more generally applicable. First, the 77 of Appendix C was ...
3
Physics and Radiobiology of Nuclear Medicine
The flux, or intensity, of the thermal neutrons so obtained ranges from 1011 to
1014 neutrons/cm2 · s, and they are useful in the production of many
radionuclides. When a target element is inserted in the reactor core, a thermal
neutron will ...
4
Encyclopaedia of Occupational Health and Safety
It is thermal neutrons that are primarily responsible for the latter types of
interaction. Elastic scattering occurs when a neutron interacts with a nucleus and
bounces oil" with reduced energy. The interacting nucleus takes up the kinetic
energy ...
Jeanne Mager Stellman,
1998
5
Neutron Physics for Nuclear Reactors: Unpublished Writings ...
E represents a thermal neutron loss by diffusion of thermal neutrons out of the
system. F represents a neutron loss caused by capture of neutrons by impurities
in uranium, graphite, and controls. G represents a neutron loss due to capture of
...
6
Nuclear Systems: Elements Of
Thermal Design
Thermal reactors by definition rely primarily on thermal neutrons to cause fissions
. At these low energies, the fission cross section for fissile nuclides is quite large (
e.g., see Fig. 2-12 for 235U). Thermal-neutron fission produces fast neutrons, ...
Thermal neutrons are those in thermal equilibrium with the atoms (or molecules)
of the medium. A particular thermal neutron may gain or lose energy in any one
collision with the nuclei of the medium, but there is no net energy exchange as a
...
8
Optical Waveguides: From Theory to Applied Technologies
Theoretically, the maximum depth in current BNCT with thermal neutrons is about
6 cm from the surface. In practice, the largest part of the thermal neutron flux
reaches a depth of 2 to 3 cm and smaller fluxes are delivered to domains deeper
...
María L. Calvo, Vasudevan Lakshminarayanan,
2007
9
Proceedings of a Conference on
Neutrons from Electron ...
A set of four TLD chips is placed at the center of each sphere and measures
thermal neutrons produced as a result of moderation of the incident neutron
spectrum. The photon and thermal-neutron responses of individual TLD chips
within a ...
H. T. Heaton, Robert Jacobs, National Measurement Laboratory (U.S.),
1979
10
An Introduction to the Passage of Energetic Particles ...
Thus, neutrons of this energy are called thermal neutrons, even though such
thermal neutrons have a distribution of energies. Neutrons with energies less
than thermal are referred to as cold neutrons. Cold neutrons can be produced in
large ...
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «THERMAL NEUTRONS»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
thermal neutrons w wiadomościach.
A 'nanomachine' for surgery with no incision
By irradiating the affected area with a pinpoint light beam, ultrasonic waves, and thermal neutrons, which can be safely administered to living organisms, specific ... «Nanowerk, Lip 15»
Implantable Devices at Risk During During Cancer Radiotherapy
In 178 courses of non-neutron-producing radiotherapy, however, the device compromise ... Thermal neutrons then interact with boron found in the metal oxide ... «MedPage Today, Cze 15»
Humble neutron is valuable tool in geology
Scientists at UCL used neutrons at ISIS and the ILL to explain this activity by .... are produced over a wide variety of energies, from hot thermal neutrons (with an ... «Phys.Org, Mar 15»
Mercury's Odd Surface Features Mapped by NASA Spacecraft
... the absorption of low-energy ("thermal") neutrons across the surface of Mercury. ... Mercury's northern hemisphere of elements that absorb thermal neutrons. «Space.com, Mar 15»
Inexpensive, flexible large area neutron detectors to monitor …
Neutron detection is used to detect thermal neutrons emitted by special nuclear material (SNM). SNM consists of fissile material used in the production of nuclear ... «Phys.Org, Maj 14»
NIAC 2013 Phase I winners showcases futuristic aerospace concepts
As seen above, in a second stage of nuclear reaction the fusion neutrons can be ... from uranium fission, rather than the two to three seen with thermal neutrons. «Gizmag, Sie 13»
Finding Mercury's Water with Infrared Lasers and Neutron Counters
The neutron spectrometer counts the number of incoming fast, epithermal, and thermal neutrons (correcting for changes in altitude) and extrapolates the data to ... «IEEE Spectrum, Gru 12»
Neutrons revive Heisenberg's first take on uncertainty
The experiment begins with a beam of mono-energetic thermal neutrons from a research reactor – the sort of neutrons that would be used in neutron-diffraction ... «physicsworld.com, Sty 12»
Still Chugging: Cambridge's Very Own Nuclear Reactor
Its director envisions that the lab's main product--streams of neutrons--could be ... that reflect neutrons from the core back as slower-moving "thermal neutrons" to ... «CBS News, Lut 11»