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[en] Certain modifications of production technology have been introduced with the aim of meeting growing demands to minimize the difference between the actual and the nominal activities of 226Ra calibration standards. The reliable filling of sources by centrifugation (the so-called wet route) also suitable for the smallest inner diameters has been introduced. The sorption of 226Ra on a ceramic sorbent has been tested for the production of the smallest standards with nominal contents of 1 and 10 μg. (author). 3 refs
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