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Title: Position-sensitive proportional counter with low-resistance metal-wire anode

Abstract

A position-sensitive proportional counter circuit is provided which allows the use of a conventional (low-resistance, metal-wire anode) proportional counter for spatial resolution of an ionizing event along the anode of the counter. A pair of specially designed active-capacitance preamplifiers are used to 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, low-noise 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 the 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).

Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863558
Patent Number(s):
4197462
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
position-sensitive; proportional; counter; low-resistance; metal-wire; anode; circuit; provided; allows; conventional; spatial; resolution; ionizing; event; pair; specially; designed; active-capacitance; preamplifiers; terminate; treated; line; stabilized; active; capacitance; loads; composed; series-feedback; low-noise; amplifier; unity-gain; shunt-feedback; output; connected; feedback; capacitor; input; loading; distributed; rc-line; position; encoding; subsequent; time; difference; decoding; sensing; rise; times; pulses; primarily; response; resistance; wire; anodes; radiation; detection; simplifies; construction; handling; stabilizes; resistivity; count; rates; 10; counts; rise times; wire anode; specially designed; proportional counter; spatial resolution; radiation detection; count rate; rise time; count rates; feedback capacitor; time difference; ionizing event; sensitive proportional; resistance wire; noise amplifier; metal-wire anode; position-sensitive proportional; counter circuit; /250/

Citation Formats

Kopp, Manfred K. Position-sensitive proportional counter with low-resistance metal-wire anode. United States: N. p., 1980. Web.
Kopp, Manfred K. Position-sensitive proportional counter with low-resistance metal-wire anode. United States.
Kopp, Manfred K. Tue . "Position-sensitive proportional counter with low-resistance metal-wire anode". United States. https://www.osti.gov/servlets/purl/863558.
@article{osti_863558,
title = {Position-sensitive proportional counter with low-resistance metal-wire anode},
author = {Kopp, Manfred K.},
abstractNote = {A position-sensitive proportional counter circuit is provided which allows the use of a conventional (low-resistance, metal-wire anode) proportional counter for spatial resolution of an ionizing event along the anode of the counter. A pair of specially designed active-capacitance preamplifiers are used to 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, low-noise 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 the 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).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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