Radiation monitoring device

An apparatus for indicating the voltage applied to a means for generating a beam of x-rays, the beam passing througgh a first filter means and a portion of the filtered beam passing through a second filter means, comprising:

• first detector means responsive to the first filtered beam for generating an output signal representing the magnitude of the radiation energy of the first filtered beam;
• second detector means responsive to the second filtered portion of the beam for generating an output signal representing the magnitude of the radiation energy of the second filtered portion of the beam;
• means responsive to the output signals of said first and second detector means for generating an indication of the voltage applied to the means for generating the beam of x-rays, said means including a first integrator means responsive to the output signal of said first detector for generating a first ramp output signal, a second integrator means responsive to the output signal of said second detector for generating a second ramp output signal, and means responsive to the first and second ramp output signals for generating the indication of voltage;
• trigger means responsive to the first ramp output signal for generating an enable signal when the magnitude of the first ramp output signal reaches a predetermined reference level;
• and
• means responsive to the second ramp signal and the enable signal for storing a signal representing the magnitude of the second ramp output signal.

An apparatus for indicating the voltage applied to a means for generating a beam of x-rays comprising:

• means for filtering a portion of the beam of x-rays to produce a first filtered beam;
• means for filtering a portion of said first filtered beam to produce a second filtered beam;
• first detector means responsive to the first filtered beam for generating a signal representing the magnitude of the radiation energy of the first filtered beam;
• second detector means responsive to the second filtered beam for generating a signal representing the magnitude of the radiation energy of the second filtered beam;
• means responsive to the signals of said first and second detector means for generating an indication of the voltage applied to the means for generating the beam of x-rays, said responsive means including a first integrator means responsive to the signal of said first detector means for generating a first ramp output signal, a second integrator means responsive to the signal of said second detector means for generating a second ramp output signal, and means responsive to the first and second ramp output signals for generating the indication of voltage;
• trigger means responsive to the first ramp output signal for generating an enable signal when the magnitude of the first ramp output signal reaches a predetermined reference level;
• and
• means responsive to the second ramp signal and the enable signal for storing a signal representing the magnitude of the second ramp output signal.

A method for indicating the voltage applied to a means for generating a beam of x-rays, a first portion of the beam passing through a filter means, comprising the steps of:

• (a) generating a first detector signal representing the magnitude of the radiation energy of the filtered first portion of the beam;
• (b) generating a second detector signal representing the magnitude of the radiation energy of the remainder of the beam;
• (c) generating a first ramp output signal in response to the signal of the first detector;
• (d) generating a second ramp output signal in response to the signal of the second detector;
• (e) generating an indication of the voltage in response to the first and second ramp output signals;
• (f) generating an enable signal when the magnitude of the first ramp output signal reaches a predetermined reference level;
• and
• (g) storing a signal representing the magnitude of the second ramp output signal in response to the second ramp output signal and the enable signal.