Abstract
The new detector described here §, being of the end-window type, is readily accessible to X-ray sources in a confined environment, and thus offers very favourable X-ray collection geometry. It exhibits extremely good resolution, particularly in the vital soft-to-ultrasoft X-ray region. The anode wire is held in a novel compact unit, which may be interchanged with ease. Other features include a built-in head amplifier and a simple assembly which allows windows to be replaced and fitted in a gas-tight seal. The variable geometry feature of the instrument arises as a result of the incorporation of a calibrated dial, by means of which the anode-to-window distance may be varied during operation. This allows the effective gas path length to be optimised, so that X-rays of a particular energy may be detected in a more selective manner.
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