The conventional aluminium filtration of a general purpose X-ray tube in a district general hospital was replaced by an erbium filter for a 2-month period. The resulting reduction in skin dose was measured for a number of examinations using thermoluminescent dosimetry. The change in effective dose equivalent was calculated from these measurements and compared with previous theoretical estimates. The use of the erbium filter had no effect on radiograph quality. It was concluded that the use of an erbium filter resulted in a worthwhile reduction in radiation dose, and was a cost-effective method of dose reduction.

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A simple-cycle, single-shaft, gas-turbine power plant has been tested with adjustable compressor-stator blading to investigate this method of reducing idle fuel flow. This paper discusses the factors affecting idle fuel flow, and presents results of power-plant tests with several stator geometries.