Gas mixtures for gas-filled radiation detectors

Patent · Mon Jan 04 23:00:00 EST 1982

OSTI ID:864095

Christophorou, Loucas G ^[1]; McCorkle, Dennis L ^[2]; Maxey, David V ^[2]; Carter, James G ^[2]

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1. Oak Ridge, TN
2. Knoxville, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4309307
• Application Number: 06/134,815
• OSTI ID: 864095
• Country of Publication: United States
• Language: English

Related Subjects

/252/250/
basis
below
binary
chosen
compared
component
components
convenient
conventional
conventional gas
detectors
drift
drift velocity
electric
electric field
electron
electron energy
electrons
energies
energy
energy range
fast
faster
field
free
free path
gas
gas mixture
gas mixtures
gas-filled
gas-filled radiation
gaseous
gaseous mixture
gases
hence
improved
improved binary
increase
mean
mean free
mixture
mixtures
molecular
molecular gas
molecular gases
noble
noble gas
path
pressure-reduced
principle
provide
provided
radiation
radiation detector
radiation detectors
range
ranges
reduced electric
reduction
response
results
scattering
section
separate
separate component
separate components
slowed
ternary
ternary gas
values
velocity
whereby