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Title: Alternating current long range alpha particle detector

Abstract

An alpha particle detector, utilizing alternating currents, which is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits which, in turn, are not susceptible to dc error components. It also allows the benefit of gas gain, if desired. In the invention, a voltage source creates an electric field between two conductive grids, and between the grids and a conductive enclosure. Air containing air ions created by collision with alpha particles is drawn into the enclosure and detected. In some embodiments, the air flow into the enclosure is interrupted, creating an alternating flow of ions. In another embodiment, a modulated voltage is applied to the grid, also modulating the detection of ions.

Inventors:
;
Publication Date:
OSTI Identifier:
6289389
Patent Number(s):
US 5187370; A
Application Number:
PPN: US 7-799464
Assignee:
Univ. of California, Alameda, CA (United States) IMS; EDB-93-122585
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 27 Nov 1991
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALPHA DETECTION; RADIATION DETECTORS; DESIGN; AC SYSTEMS; AIR FLOW; ELECTRIC CONDUCTORS; ELECTRIC CURRENTS; ELECTRIC FIELDS; ERRORS; IONIZATION; CHARGED PARTICLE DETECTION; CURRENTS; DETECTION; ENERGY SYSTEMS; FLUID FLOW; GAS FLOW; MEASURING INSTRUMENTS; POWER SYSTEMS; RADIATION DETECTION; 440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments

Citation Formats

MacArthur, D.W., and McAtee, J.L.. Alternating current long range alpha particle detector. United States: N. p., 1993. Web.
MacArthur, D.W., & McAtee, J.L.. Alternating current long range alpha particle detector. United States.
MacArthur, D.W., and McAtee, J.L.. 1993. "Alternating current long range alpha particle detector". United States. doi:.
@article{osti_6289389,
title = {Alternating current long range alpha particle detector},
author = {MacArthur, D.W. and McAtee, J.L.},
abstractNote = {An alpha particle detector, utilizing alternating currents, which is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits which, in turn, are not susceptible to dc error components. It also allows the benefit of gas gain, if desired. In the invention, a voltage source creates an electric field between two conductive grids, and between the grids and a conductive enclosure. Air containing air ions created by collision with alpha particles is drawn into the enclosure and detected. In some embodiments, the air flow into the enclosure is interrupted, creating an alternating flow of ions. In another embodiment, a modulated voltage is applied to the grid, also modulating the detection of ions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 2
}
  • An alpha particle detector, utilizing alternating currents, whcih is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits which, in turn, are not susceptible to dc error components. It also allows the benefit of gas gain, if desired. In the invention, a voltage source creates an electric field between two conductive grids, and between the grids and a conductive enclosure. Air containing air ions created by collision with alpha particles is drawn into the enclosure and detected. In some embodiments, the air flow into the enclosure is interrupted, creating anmore » alternating flow of ions. In another embodiment, a modulated voltage is applied to the grid, also modulating the detection of ions.« less
  • An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air containing air molecules ionized by alpha particles through an air passage and across a second electrically conductive mesh. The current in the second electrically conductive mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.
  • An alpha particle detector capable of detecting alpha radiation from distant sources. A high voltage is generated near a conductive mesh while a fan draws air containing air molecules ionized by alpha particles across the mesh. The current in the mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.
  • An alpha particle detector capable of detecting alpha radiation from distant sources. In one embodiment, a high voltage is generated in a first electrically conductive mesh while a fan draws air containing air molecules ionized by alpha particles through an air passage and across a second electrically conductive mesh. The current in the second electrically conductive mesh can be detected and used for measurement or alarm. The detector can be used for area, personnel and equipment monitoring.
  • A fan-less long range alpha detector which operates by using an electrical field between a signal plane and the surface or substance to be monitored for air ions created by collisions with alpha radiation. Without a fan, the detector can operate without the possibility of spreading dust and potential contamination into the atmosphere. A guard plane between the signal plane and the electrically conductive enclosure and maintained at the same voltage as the signal plane, reduces leakage currents. The detector can easily monitor soil, or other solid or liquid surfaces.