For electrons incident on a thick target, the fraction F of energy converted to x‐ rays is approximately: F=7x10‐4 Z Ek Z is the atomic number of the target, and Ek is the accelerating voltage in MV.

The dose rate for your unit can be calculated: X (rad/sec) = 50 x V (kV) xI (mA) x Ztarget / [r (cm)]2 x74 For example, the dose rate at 2 cm from a copper target operated at 80 kV and 100mA is: 50 x 80

The maximum x‐ray energy, when expressed in keV, is equal to the voltage applied between the cathode and anode, in this case 120 kV. The average x‐ray energy is about one‐third of the maximum.

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