Using the data plotted in Fig. 9.3, find the total applied voltage necessary for a PM tube with a six-stage multiplier using GaP(Cs) dynodes to achieve an electron gain factor of 2.8 x 10⁶.

 

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50 40 GaP(Cs) 30 10 Cs, Sb BeO Mgo 100 200 300 400 500 600 700 800 Primary electron energy-eV Figure 9.3 Variation of the secondary emission yield with primary electron energy for standard dynode materials (lower three curves) and an NEA material [GaP(Cs)]. (From Krall et al.) Secondary emission ratio (6) 20 50 40 GaP(Cs) 30 10 Cs, Sb BeO Mgo 100 200 300 400 500 600 700 800 Primary electron energy-eV Figure 9.3 Variation of the secondary emission yield with primary electron energy for standard dynode materials (lower three curves) and an NEA material [GaP(Cs)]. (From Krall et al.) Secondary emission ratio (6) 20