Draw a graph to illustrate the variation of ionization current and p.d across an ionization chamber and explain its features. 

Draw a graph to illustrate the variation of ionization current and p.d across an ionization chamber and explain its features.

Region OA:

Current detected increases gradually but p.d is not large enough to prevent recombination of the ions.

Region AB. (saturation region)

Current is almost constant, all ions reach the electrode before recombination but there is no secondary ionization.

 Region BC (gas amplification)          

Current increases rapidly for small increase (change) in p.d. because secondary ionization takes place due to primary ions being produced. This implies many ion pairs, thus a larger current detected.

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