Abstract
An aluminum rod, with a diameter of 1.4 cm and a length of 36.8 cm, has been used as an external scatter suspended between two identical caesium-137 (662 keV) gamma radiation sources, which are shielded to produce a pencil beam of diameter 1.2 cm. Two high-energy resolution detector (germanium—lithium of 1.95 keV energy resolution at 662 KeV) are positioned and collimated to receive singly-Compton-scattered photons from selected portions of the scatterer. An object whose density distribution is to be measured is placed vertically between the planes of the scatterer and the detectors. The entire arrangement is configured and aligned so that the singly-Compton-scattered photons from the scatterer encompass the cross-section of the object before reaching the detectors. As a result, the minimun and maximum selected angles of scatter are 36° and 54° respectively. The characteristics and plausibility of this geometry are established. However, a special material as a scatterer and directionally-sensitive high energy resolution detectors with high count rates are required to realize fully the potential advantages of the system. The figure of merit (confidence level), in addition to statistical random error assiciated with the data, suggests that, with an adequate scatterer, the data from this geometry are highly likely to be superior to those from other currently available methods.
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