Q a)?An ionization chamber is used with an electrometer capable of measuring 50µA. Calculate the...

Question

Q a)?An ionization chamber is used with an electrometer capable of measuring 50µA. Calculate the rate at which 0.835MeV beta particles must enter the chamber to just produce a measurable response.

?b)?These beta particles produce on the average 80 ion pairs in a counter operating in the proportional region with a gas amplification factor of 6´104. At what rate will the particles need to enter the chamber to produce an average current of 50µA?

David · Accepted Answer

Q a) An ionization chamber is used with an electrometer capable of measuring 50µA. Calculate the rate 
at which 0.835MeV beta particles must enter the chamber to just produce a measurable response. 
Answer 
Given Measureable Current = 50µA  = 50 x 10-6 A 
Energy = 0.835 MeV = 0.835 x 10-13J 
Since energy of the beta particles is also given so we can calculate its velocity also with which it will 
enter to the chamber,

Q a)?An ionization chamber is used with an electrometer capable of measuring 50µA. Calculate the rate at which 0.835MeV beta particles must enter the chamber to just produce a measurable response....

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