Gridded ionization chamber. [for computerized tomography]

Patent · Tue Sep 06 00:00:00 EDT 1977

OSTI ID:5050915

Houston, J M

An improved ionization chamber type x-ray detector comprises a heavy gas at high pressure disposed between an anode and a cathode. An open grid structure is disposed adjacent the anode and is maintained at a voltsge intermediate between the cathode and anode potentials. The electric field which is produced by positive ions drifting toward the cathode is thus shielded from the anode. Current measuring circuits connected to the anode are, therefore, responsive only to electron current flow within the chamber and the recovery time of the chamber is shortened. The grid structure also serves to shield the anode from electrical currents which might otherwise be induced by mechanical vibrations in the ionization chamber structure.

• Assignee: General Electric Co.
• Patent Number(s): US 4047040
• Application Number: TRN: 78-009924
• OSTI ID: 5050915
• Resource Relation: Patent File Date: Filed date 6 May 1976
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
62 RADIOLOGY AND NUCLEAR MEDICINE
IONIZATION CHAMBERS
DESIGN
TOMOGRAPHY
X-RAY DETECTION
ANODES
CAT SCANNING
CATHODES
POSITION SENSITIVE DETECTORS
X-RAY RADIOGRAPHY
DIAGNOSTIC TECHNIQUES
ELECTRODES
INDUSTRIAL RADIOGRAPHY
MATERIALS TESTING
MEASURING INSTRUMENTS
NONDESTRUCTIVE TESTING
PHOTON TRANSMISSION SCANNING
RADIATION DETECTION
RADIATION DETECTORS
TESTING
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
550600 - Medicine