3) I have an ionization detector that is filled with a gas that undergoes ionization with...

3) I have an ionization detector that is filled with a gas that undergoes ionization with on average 100 eV of input energy. A positive voltage is applied to a wire running down the center of the cylindrical detector, while the outer cylinder wall is held at negative voltage; I can control both of those voltages.

a) I find that when I measure a Cs-137 source and then a Co-60 source at one voltage, I find that measured currents are proportional to my detected energy, with a measured energy resolution of 1.2% for Cs-137. What mode am I operating my ionization detector in: under-voltage, ionization, proportional, or Geiger?

b) I then adjust my voltage and find a set current is produced by both Cs-137 and Co-60 sources, What mode am I operating my detector in now? Did I turn my voltage up or down?

Expert Solution

a) In this, you are working in proportional region as the current obtained is found to be proportional to energy of input radiation.Scintillator detector is used for this purpose in which we can measure the energy of incoming radiations with such resolution and sources can be identified.

In Geiger region pulses of equal heights are obtained as output hence it can not be used to differentiate between the energies of incoming radiations.GM counter operates in this region in which we can only count the number of particles not their energy.

b) Now if you get a set current means you are working in Geiger region as I have already explained that in it we get pulses of equal height in output (means fixed current) and energy can not be found.The attached voltage diagram will clear everything about the voltage regions in which various gas filled detectors operate.We can see that GM region is operated at higher voltage than proportional region.

genius_generous answered 2 years ago

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