Abstract
The method of producing images of high energy emission by means of coded apertures is by now well established in fields as diverse as medicine, nuclear physics and astronomy. It is in the latter, however, where more complication occurs due to the inaccessibility of the instrument, be it satellite or balloon-borne, around the time of the actual observations. In this paper we review the optimisation of the design of telescopes for operation within the low energy gamma-ray band and the various techniques which have been employed to reduce the disturbing effects of spatial and temporal variations in the background counting rate in these instruments.
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