Design considerations for a high-spatial-resolution positron camera with dense-drift-space MWPC's

Conference · Fri Oct 01 04:00:00 EDT 1982

OSTI ID:6944886

Del Guerra, A; Perez-Mendez, V; Schwartz, G; Nelson, W R

A multiplane Positron Cameris is proposed, made of six MWPC modules arranged to form the lateral surface of a hexagonal prism. Each module (50 x 50 cm/sup 2/) has a 2 cm thick lead-glass tube converter on both sides of a MWPC pressurized to 2 atm. Experimental measurements are presented to show how to reduce the parallax error by determining in which of the two converter layers the photon has interacted. The results of a detailed Monte Carlo calculation for the efficiency of this type of converter are shown to be in excellent agreement with the experimental measurements. The expected performance of the Positron Camera is presented: a true coincidence rate of 56,000 counts/s (with an equal accidental coincidence rate and a 30% Compton scatter contamination) and a spatial resolution better than 5.0 mm (FWHM) for a 400 ..mu.. Ci point-like source embedded in a 10 cm radius water phantom.

• Research Organization: Lawrence Berkeley Lab., CA (USA); Stanford Linear Accelerator Center, CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6944886
• Report Number(s): LBL-14414; CONF-821011-17; ON: DE83003051
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550601 -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
DESIGN
EFFICIENCY
GAMMA CAMERAS
IMAGE CONVERTERS
IMAGE TUBES
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
PERFORMANCE
POSITRON CAMERAS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RESOLUTION
SPATIAL RESOLUTION