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Title: Positron imaging with multiwire proportional chamber-gamma converter hybrid detectors

Abstract

A large area positron camera was developed using multiwire proportional chambers as detectors and electromagnetic delay lines for coordinate readout. Honeycomb structured gamma converters made of lead are coupled to the chambers for efficient gamma detection and good spatial resolution. Two opposing detectors, each having a sensitive area of 48 cm x 48 cm, are operated in coincidence for the detection of annihilation gammas (511 keV) from positron emitters. Detection efficiency of 4.2 percent per detector and spatial resolution of 6 to 7 mm FWHM at the mid-plane were achieved. The present camera operates at a maximum count rate of 24 K counts/min, limited by accidental coincidence. The theory for the gamma converter is presented along with a review of the operation of the multiwire proportional chamber and delay line readout. Calculated gamma converter efficiencies are compared with the measured results using a prototype test chamber. The characteristics of the positron camera system is evaluated, and the performance is shown to be consistent with calculation.

Authors:
Publication Date:
Research Org.:
California Univ., Berkeley (USA). Lawrence Berkeley Lab.
OSTI Identifier:
7323180
Report Number(s):
LBL-5394
TRN: 77-009280
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 62 RADIOLOGY AND NUCLEAR MEDICINE; MULTIWIRE PROPORTIONAL CHAMBERS; POSITRON CAMERAS; DESIGN; PERFORMANCE; COINCIDENCE METHODS; COUNTING RATES; DELAY CIRCUITS; EFFICIENCY; HONEYCOMB STRUCTURES; READOUT SYSTEMS; SPATIAL RESOLUTION; CAMERAS; COUNTING TECHNIQUES; ELECTRONIC CIRCUITS; GAMMA CAMERAS; MEASURING INSTRUMENTS; MECHANICAL STRUCTURES; PROPORTIONAL COUNTERS; RADIATION DETECTORS; RESOLUTION; 440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments; 550601 - Medicine- Unsealed Radionuclides in Diagnostics

Citation Formats

Chu, D Y.H. Positron imaging with multiwire proportional chamber-gamma converter hybrid detectors. United States: N. p., 1976. Web. doi:10.2172/7323180.
Chu, D Y.H. Positron imaging with multiwire proportional chamber-gamma converter hybrid detectors. United States. https://doi.org/10.2172/7323180
Chu, D Y.H. Wed . "Positron imaging with multiwire proportional chamber-gamma converter hybrid detectors". United States. https://doi.org/10.2172/7323180. https://www.osti.gov/servlets/purl/7323180.
@article{osti_7323180,
title = {Positron imaging with multiwire proportional chamber-gamma converter hybrid detectors},
author = {Chu, D Y.H.},
abstractNote = {A large area positron camera was developed using multiwire proportional chambers as detectors and electromagnetic delay lines for coordinate readout. Honeycomb structured gamma converters made of lead are coupled to the chambers for efficient gamma detection and good spatial resolution. Two opposing detectors, each having a sensitive area of 48 cm x 48 cm, are operated in coincidence for the detection of annihilation gammas (511 keV) from positron emitters. Detection efficiency of 4.2 percent per detector and spatial resolution of 6 to 7 mm FWHM at the mid-plane were achieved. The present camera operates at a maximum count rate of 24 K counts/min, limited by accidental coincidence. The theory for the gamma converter is presented along with a review of the operation of the multiwire proportional chamber and delay line readout. Calculated gamma converter efficiencies are compared with the measured results using a prototype test chamber. The characteristics of the positron camera system is evaluated, and the performance is shown to be consistent with calculation.},
doi = {10.2172/7323180},
url = {https://www.osti.gov/biblio/7323180}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {9}
}