Method for pole-zero adjustment in radiation measurement systems
View Patent ↗A method for automatic Pole-Zero adjustment in a radiation measurement system, the method including steps of: receiving a plurality of pulses from a radiation detector; for each of the plurality of pulses, synthesizing a multiple-peak pulse shape; and using the amplitude measurement of individual peaks in each of the multiple-peak pulse shapes to adjust the pole-zero of the radiation measurement system.
1. A method for performing automatic adjustment of the Pole-Zero adjustment circuitry in a radiation measurement system, the radiation measurement system comprising pulse processing circuitry, said method comprising the steps of:
(a) receiving within the pulse processing circuitry a plurality of pulses from an ionizing radiation detector;
(b) for each said plurality of pulses, automatically synthesizing, within the pulse processing circuitry, a multiple-peak pulse shape; and
(c) using the amplitude measurement of individual peaks in each of said multiple-peak pulse shape to adjust the Pole-Zero of the radiation measurement system.
2. A method in accordance with claim 1 , further including: a step of detecting and measuring amplitudes of all peaks in said multiple-peak pulse shape.
3. A method in accordance with claim 2 , further including: a step of rejecting amplitude measurements of multiple-peak pulse shapes whose peaks are not pile-up free.
4. A method in accordance with claim 3 , further including: a step of finding peak differences between amplitude of first peak in said multiple-peak pulse shape and all other peaks in said multiple-peak pulse shapes.
5. A method in accordance with claim 4 , further including: a step of obtaining a peak difference sum by adding together peak differences obtained from a plurality of said amplitude measurements of peaks of said multiple-peak pulse shapes.
6. A method in accordance with claim 5 , further including: a step of adjusting said Pole-Zero adjustment circuitry of said radiation measurement system until peak difference sum is minimized.
7. A radiation measurement system, the system comprising:
pulse processing circuitry for receiving the pulse output from an ionizing radiation detector, the pulse processing circuitry comprising:
Pole-Zero adjustment circuitry; and
multiple-peak pulse shaping and detection circuitry for synthesizing a multiple-peak pulse shape for controlling the Pole-Zero adjustment.
8. The system of claim 7 , wherein the amplitude measurement of the individual peaks in each multiple-peak pulse shape is used to adjust the Pole-Zero adjustment circuitry.
9. The system of claim 8 further comprising:
pulse pile-up detection circuitry for rejecting the amplitude measurements of multiple-peak pulse shapes whose peaks are not pile-up free.
10. The system of claim 9 wherein the pulse processing circuitry computes peak differences between the amplitude of the first peak in the multiple-peak pulse shape and all other peaks in the multiple-peak pulse shapes.
11. The system of claim 10 wherein the pulse processing circuitry obtains a peak difference sum by adding together peak differences obtained from a plurality of the amplitude measurements of peaks of the multiple-peak pulse shapes.
12. The system of claim 11 wherein the pulse processing circuitry adjusts the Pole-Zero adjustment circuitry until the peak difference sum is minimized.