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The distribution of Pu-238 and Pu-239+240 in the sediments of the 'Altrhein', a former branch of the river Rhine which serves as a main canal for liquid effluents from the Nuclear Research Center, was measured. Transverse, longitudinal and depth profiles were taken. The transverse profiles are different: either the 'Altrhein' moves in a bend or he moves on a straight line in the middle of the river-bed. The sediments are homogeneously contaminated with plutonium up to the lowest layer which is in about 70 cm depth. The contamination of the longitudinal profiles depends on the straitening of the 'Altrhein', on the width of the river, and on the distance from the location of discharge of the waste water. In the 'Altrhein' 94% of plutonium, in total, emitted with the waste water, were refound. (Atomindex citation 11:513511)