Gamma-ray detection with PbO glass converters in MWPC: electron conversion efficiency and time resolution

Conference · Sat Nov 01 04:00:00 EST 1980

OSTI ID:7066244

Lum, G K; Perez-Mendez, V; Sleaford, B

The development of glass tube converters for efficient gamma-ray detection in multi-wire proportional chambers (MWPC) has led to an investigation of the improvement of conductivity on glass surfaces and to an investigation of gas mixtures which will improve on the electron conversion efficiency and electron transit time within the tubes. Efforts to establish uniform electric field lines within small diameter tubes has resulted in an improved H/sub 2/ reducing treatment. For a 2 cm thick converter made of glass tubing (0.9 mmID;1.10 mmOD) the electron conversion efficiency epsilon was measured to be 9.0% and 10.4% at 511 keV, using Ar mixtures containing 10% CF/sub 4/ and 30% isobutane, respectively. The effects of gas mixtures on epsilon and on tau, the mean transit time on conversion electrons within the converter, and the projection of these results to the performance of a modified MWPC positron camera are presented.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.; California Univ., San Francisco (USA). Dept. of Radiology
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7066244
• Report Number(s): LBL-11766; CONF-801103-42
• Country of Publication: United States
• Language: English

Related Subjects

440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CHALCOGENIDES
DETECTION
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
GAMMA DETECTION
GLASS
HYDROGEN
LEAD COMPOUNDS
LEAD OXIDES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROPORTIONAL COUNTERS
RADIATION DETECTION
RADIATION DETECTORS
RESOLUTION
SURFACES