Position-sensitive proportional counter with low-resistance metal-wire anode
A position-sensitive proportional counter circuit is provided which uses a conventional (low-resistance, metal-wire anode) proportional counter for spatial resolution of an ionizing event along the anode of the counther. A pair of specially designed activecapacitance preamplifiers terminate the anode ends wherein the anode is treated as an RC line. The preamplifiers act as stabilized active capacitance loads and each is composed of a series-feedback, lownoise amplifier, a unity-gain, shunt-feedback amplifier whose output is connected through a feedback capacitor to the series-feedback amplifier input. The stabilized capacitance loading of the anode allows distributed RC-line position encoding and subsequent time difference decoding by sensing the difference in rise times of pulses at te anode ends where the difference is primarily in response to the distributed capacitance along the anode. This allows the use of lower resistance wire anodes for spatial radiation detection which simplifies the counter construction and handling of the anodes, and stabilizes the anode resistivity at high count rates (> 10/sup 6/ counts/sec).
- Assignee:
- Dept. of Energy
- Patent Number(s):
- US 4197462
- OSTI ID:
- 5152638
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AMPLIFIERS
ANODES
COUNTING RATES
DETECTION
ELECTRODES
ELECTRONIC EQUIPMENT
MEASURING INSTRUMENTS
POSITION SENSITIVE DETECTORS
PROPORTIONAL COUNTERS
RADIATION DETECTION
RADIATION DETECTORS
RESOLUTION
SPATIAL RESOLUTION