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Title: Gas mixtures for gas-filled radiation detectors

Improved binary and ternary gas mixtures for gas-filled radiation detectors are provided. The components are chosen on the basis of the principle that the first component is one molecular gas or mixture of two molecular gases having a large electron scattering cross section at energies of about 0.5 eV and higher, and the second component is a noble gas having a very small cross section at and below about 1.0 eV, whereby fast electrons in the gaseous mixture are slowed into the energy range of about 0.5 eV where the cross section for the mixture is small and hence the electron mean free path is large. The reduction in both the cross section and the electron energy results in an increase in the drift velocity of the electrons in the gas mixtures over that for the separate components for a range of E/P (pressure-reduced electric field) values. Several gas mixtures are provided that provide faster response in gas-filled detectors for convenient E/P ranges as compared with conventional gas mixtures.
Inventors:
 [1];  [2];  [2];  [2]
  1. (Oak Ridge, TN)
  2. (Knoxville, TN)
Issue Date:
OSTI Identifier:
864095
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Patent Number(s):
US 4309307
Application Number:
06/134,815
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
Language:
English
Subject:
gas; mixtures; gas-filled; radiation; detectors; improved; binary; ternary; provided; components; chosen; basis; principle; component; molecular; mixture; gases; electron; scattering; section; energies; noble; below; whereby; fast; electrons; gaseous; slowed; energy; range; hence; mean; free; path; reduction; results; increase; drift; velocity; separate; pressure-reduced; electric; field; values; provide; faster; response; convenient; ranges; compared; conventional; separate components; ternary gas; electron energy; free path; mean free; molecular gas; gas mixtures; gaseous mixture; electric field; radiation detector; gas mixture; radiation detectors; noble gas; energy range; reduced electric; drift velocity; conventional gas; molecular gases; improved binary; gas-filled radiation; separate component; /252/250/