At ____ kV, efficiencies are 37% for a-Se and 52% for CsI.

Name: At ____ kV, efficiencies are 37% for a-Se and 52% for CsI.
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The efficiencies mentioned are for two different scintillators (a-Se and CsI) at a certain voltage. Therefore, the choice would be based on the voltage at which the efficiencies are the highest. Among the given options, 120 kV has the highest efficiency for both scintillators (37% for a-Se and 52% for CsI), making it the best choice.

At ____ KV, Efficiencies Are 37% for A-Se and 52