(a) Calculate the height of the voltage pulse observed if the 1.33 MeV gamma ray from 60Co is collected in an ionization counter filled with argon gas having a collection efficiency of 0.7. Assume it takes 25 s to collect the electrons and that the current is dissipated through a 1 M resistor.

(b) Using the same parameters as in part (a), pulses of height 0.982 mV are observed from another source. What energy of particle caused these pulses?