High resolution, high rate X-ray spectrometer

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866218

Goulding, Frederick S ^[1]; Landis, Donald A ^[2]

---

1. Lafayette, CA
2. Pinole, CA

A pulse processing system (10) for use in an X-ray spectrometer in which a ain channel pulse shaper (12) and a fast channel pulse shaper (13) each produce a substantially symmetrical triangular pulse (f, p) for each event detected by the spectrometer, with the pulse width of the pulses being substantially independent of the magnitude of the detected event and with the pulse width of the fast pulses (p) being substantially shorter than the pulse width of the main channel pulses (f). A pile-up rejector circuit (19) allows output pulses to be generated, with amplitudes linearly related to the magnitude of the detected events, whenever the peak of a main channel pulse (f) is not affected by a preceding or succeeding main channel pulse, while inhibiting output pulses wherein peak magnitudes of main channel pulses are affected by adjacent pulses. The substantially symmetrical triangular main channel pulses (f) are generated by the weighted addition (27-31) of successive RC integrations (24, 25, 26) of an RC differentiated step wave (23). The substantially symmetrical triangular fast channel pulses (p) are generated by the RC integration ( 43) of a bipolar pulse (o) in which the amplitude of the second half is 1/e that of the first half, with the RC time constant of integration being equal to one-half the width of the bipolar pulse.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4658216
• OSTI ID: 866218
• Country of Publication: United States
• Language: English

Related Subjects

resolution
rate
x-ray
spectrometer
pulse
processing
10
channel
shaper
12
fast
13
produce
substantially
symmetrical
triangular
event
detected
width
pulses
independent
magnitude
shorter
main
pile-up
rejector
circuit
19
allows
output
generated
amplitudes
linearly
related
events
whenever
peak
affected
preceding
succeeding
inhibiting
magnitudes
adjacent
weighted
addition
27-31
successive
integrations
24
25
26
differentiated
step
wave
23
integration
43
bipolar
amplitude
half
time
constant
equal
one-half
x-ray spectrometer
channel pulse
bipolar pulse
output pulses
pulse shape
output pulse
pulse width
substantially independent
main channel
time constant
pulse shaper
substantially symmetrical
pulse processing
detected event
detected events
channel pulses
linearly related
fast channel
/327/