FACTOID # 27: If you're itching to live in a trailer park, hitch up your home and head to South Carolina, where a whopping 18% of residences are mobile homes.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Beta particles

Beta particles are high-energy electrons emitted by certain types of radioactive nuclei such as potassium-40. The beta particles emitted are a form of ionizing radiation also known as beta rays. The production of beta particles is termed beta decay. They are designated by the greek letter (β).


There are two forms of beta decay, β and β+, which respectively give rise to the electron and the positron.



Contents

1 See also

β decay (electron)

Unstable atomic nuclei with an excess of neutrons may undergo β decay, where a neutron is converted into a proton, an electron and an electron-type antineutrino (the antiparticle of the neutrino):



The electron and the antineutrino are emitted from the nucleus.




β+ decay (positron)

Unstable nuclei that are deficient in neutrons may undergo β+ decay, where a proton is converted into a neutron, a positron and an electron-type neutrino:



The positron and the neutrino are emitted from the nucleus.




The neutrino and conservation of energy

Due to the presence of the neutrino, the atom and the beta particle do not usually recoil in opposite directions. This observation led Wolfgang Pauli to postulate the existence of neutrinos in order to prevent violation of conservation of energy and momentum laws. Beta decay is mediated by the weak nuclear force.



Beta particles can be stopped by a few mil (1/1000 in.) of aluminum and its flight is ten times farther than an alpha particle although it ionizes a tenth less than an alpha particle.


See also



  Results from FactBites:
 
Alpha particle - Wikipedia, the free encyclopedia (876 words)
They consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; hence, it can be written as He Alpha particles are emitted by radioactive nuclei such as uranium or radium in a process known as alpha decay.
In contrast to beta decay, alpha decay is mediated by the strong nuclear force.
When an alpha particle is emitted, the atomic mass of an element goes down by roughly 4 amu, due to the loss of 4 nucleons.
Beta particle - definition of Beta particle in Encyclopedia (263 words)
Beta particles are high-energy electrons emitted by certain types of radioactive nuclei such as potassium-40.
Beta decay is mediated by the weak nuclear force.
Beta particles can be stopped by a few millimeters of aluminum and itÂ’s flight is ten times farther than an alpha particle although it ionizes a tenth less than an alpha particle.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m