Difference between revisions of "Forest IonizationChambers"

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= Proportional Counter=
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= Recombination=
  
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Until the voltage reaches a high enough value (threshold), the liberated electrons produces will recombine with the gas before reaching the wire.
  
 +
=Ionization=
 +
 +
Once the voltage is increased beyond the above threshold, the ions/ electrons make it to the cathode/anode and produce an electronic pulse on the wire (cathode).
 +
 +
quick definitions
 +
 +
;Anode
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: Current IN,  positively charged electrode
 +
 +
;Cathode
 +
:Current OUT, negatively charged electrode
 +
 +
The flow of electrons is from the cathode to the anode.  Current is defined as the opposite direction to the electron flow.
  
  

Revision as of 18:13, 9 June 2008

An ionization chamber is essentially a gas filled volume which has one or more wires suspended inside with a voltage bias used to collect any ions or liberated electrons within the volume.

There are 4 basic operating regions which are determined by the amount of the voltage across the wire(s).

  1. recombination
  2. ionization
  3. proportional (plataue)
  4. Geiger-Muller


Recombination

Until the voltage reaches a high enough value (threshold), the liberated electrons produces will recombine with the gas before reaching the wire.

Ionization

Once the voltage is increased beyond the above threshold, the ions/ electrons make it to the cathode/anode and produce an electronic pulse on the wire (cathode).

quick definitions

Anode
Current IN, positively charged electrode
Cathode
Current OUT, negatively charged electrode

The flow of electrons is from the cathode to the anode. Current is defined as the opposite direction to the electron flow.


GM Plateau.jpg


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