Counts Rate (44 MeV LINAC)

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LINAC parameters used in calculations

1) pulse width 50 ns
2) pulse current 50 A
3) repetition rate 300 Hz
4) energy 44 MeV

number of electrons/sec on radiator

[math] 50ps \times 50A \times 300Hz \times \frac{1\cdot e^-}{1.6\cdot 10^{-19}C} = 0.47 \cdot 10^{13} \frac{e^-}{sec}[/math]

number of photons/sec from radiator

Bremsstrahlung

from plot above we have about 0.1 photons/electrons/MeV/r.l from 10 MeV to 20 MeV region

Radiation length

Take [math]_{22}[/math]Ti for radiator --> density is 4.506 g/cm^3

                                        --> radiation length is 16.17 g/cm^2    

Assume the radiator thickness is [math]12.5 /mu m[/math]

==

[math]10^{-3} \frac{\gamma 's}{(e^-\ MeV\ r.l.)} \times 2 \cdot 10^{-4} r.l. \times 44 MeV \times 0.375 \cdot 10^{12} \frac{e^-}{sec}=0.3 \cdot 10^{7} \frac{\gamma}{sec}[/math]