How can the sensitivities of ionization chambers be improved? What happens when the voltage is increased? Proportional Counters Gas Multiplication Key Components in a Simple lonization Chamber Io XOO V Load 一十-+十 Detector Amp chamber meter 十一十一十+十一+一十+一 Proportional counters +-+-+-+-+-+-+-+-+-+-+ Gas multiplication due to +-+-+-+-+-+-+-+-+-+-+-+-secondary ion pairs when the +-+-+-+-+-+-+-+-+-+-+-+-ionization chambers operate at 十 higher voltage not only collect but also accelerate electrons5 Proportional Counters Key Components in a Simple Ionization Chamber ??? +? ? + – Ampere￾meter Detector chamber Ionizing radiation Battery Load resister Gas Multiplication –+  –+–+–+  –+–+–+–+–+–+–+–+–+  –+–+–+–+–+–+–+–+–+–+–+– +–+–+–+–+–+–+–+–+–+–+–+– +–+–+–+–+–+–+–+–+–+–+–+– + Proportional counters Gas multiplication due to secondary ion pairs when the ionization chambers operate at higher voltage. X00 V How can the sensitivities of ionization chambers be improved? What happens when the voltage is increased? not only collect but also accelerate electrons