Abstract
An improved windowless gas-flow proportional X-ray detector has been used to make more sensitive and convenient measurement of nuclear fallout-derived 55Fe in freshwater and marine sediments. The iron extracted from a sediment is radiochemically purified and a part (about 500 mg) electroplated on an area (200 cm 2) of the inside wall of a copper cylinder. This cylinder in turn becomes the cathode of the X-ray detector. A specially designed anti-coincidence multi-electrode gas-flow proportional detector surrounds the X-ray detector and reduces its background in the Mn X-ray region to 0.09 counts/min keV. The detection sensitivity (precision ±50%) for the measurement of 55Fe in typical sediments is around 16 disintegrations/min kg of dry sediment.
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