LABORATORY NOTES 993platform at the rear supports an auxiliary beam stop, S, of tungsten, mercury or other heavy element that may be required if hard radiation is present in the incident beam.Minor features of the design can be deduced from the drawings. The prototype allowed 20 values from 0 to 60°; it entirely contained unwanted Laue reflections and tracked accurately over the wavelength range tested. It has been used when scattering in the horizontal plane but can be oriented in any direction without loss of performance.
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