Abstract
The response of a spark chamber gamma camera to three-dimensional test objects has been simulated in a computer. The simulation was based on efficiency and point response function measurements for single parallel hole collimators using a Geiger counter as the detector. Measurements and simulations were also done using a NaI scintillation detector. A comparison of the two simulations shows that the product of activity in test objects and exposure time for the spark chamber system is of the order of 1000 times that for a NaI scintillation detector for the same visualization statistics. This results from the spark chamber's low detection efficiency and a loss of contrast caused by an inability to discriminate against scattered radiation.
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