Radium in baggerspecie afkomstig uit het Rijnmondgebied; resultaten over 1997
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Type
Report
Language
nl
Date
1998-02-28
Research Projects
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Journal Issue
Title
Radium in baggerspecie afkomstig uit het
Rijnmondgebied; resultaten over 1997
Translated Title
Analysis of radium in sediment samples from the
Rhine delta over 1997
Published in
Abstract
Van 18 havenspeciemonsters die in 1997 zijn verzameld
in de Rotterdamse havens en in de Nieuwe Waterweg, is het 226Ra-gehalte en
de korrelgrootte-verdeling bepaald. Hieruit is afgeleid hoe groot de
invloed op het 226Ra-gehalte is van lozingen door de fosfaaterts-verwerkende
industrie. Zoals in eerdere meetcampagnes is vastgesteld, is de invloed van
de industrie vooral merkbaar in de omgeving van en in de eerste en tweede
Petroleumhaven. Verhogingen van het 226Ra-gehalte tot maximaal 211 Bq/kg
zijn gemeten ten opzichte van een achtergrond varierend tussen 22 en 46
Bq/kg. Van het geloosde 226Ra blijft naar schatting 13% in de havens
achter. De jaarlijks verzamelde monsters lijken de langjarige trend in de
lozingen te weerspiegelen.
Eighteen sediment samples collected in 1997 in the harbours and waterways of the Rhine delta were analysed for their 226Ra content and grain-size distribution. The effect of the emissions from the phosphate-processing industries on the 226Ra content could be inferred on the basis of these data. As observed in previous monitoring campaigns, the influence of this industry is greatest in and nearby the first and second petroleum harbours. Increases in the 226Ra content of up to 211 Bq/kg were measured in comparison to background levels of 22 to 46 Bq/kg. Approximately 13% of the released 226Ra is deposited in the harbours and waterways. Samples collected once every year were found to reflect the long-term trend in the emissions.
Eighteen sediment samples collected in 1997 in the harbours and waterways of the Rhine delta were analysed for their 226Ra content and grain-size distribution. The effect of the emissions from the phosphate-processing industries on the 226Ra content could be inferred on the basis of these data. As observed in previous monitoring campaigns, the influence of this industry is greatest in and nearby the first and second petroleum harbours. Increases in the 226Ra content of up to 211 Bq/kg were measured in comparison to background levels of 22 to 46 Bq/kg. Approximately 13% of the released 226Ra is deposited in the harbours and waterways. Samples collected once every year were found to reflect the long-term trend in the emissions.
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DGM/SVS