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Mattern FCM ; Drost RMS ; Ockhuizen A

27 p in Dutch   1991

Toon Nederlands

English Abstract
Measurements of the concentrations in pasture and milk samples from the surroundings of nuclear installations gave for 1990 the following average values in pasture: Be-7: 69 +- 7 Bq/kg, K-40: 910 +- 80 Bq/kg, Sr-90: 2.3 +- 0.4 Bq/kg, Cs-137: 4.4 +- 1.2 Bq/kg. Concentrations of Sr-89 and I-131 were below the limit of detection, the same did mostly apply to Cs-134. The average of the rest-beta-activity in pasture was 110 +- 10 Bq/kg ; the rest-gamma-activities were mostly below the limit of detection. The concentration of stabile Ca was found to be 4.8 +- 0.3 g/kg. Average concentrations in milk were for Sr-90 0.041 +- 0.003 Bq/L and for Cs-137 0.11 +- 0.03 Bq/L. Concentrations of Sr-89 and I-131 were below the limit of detection, the same did mostly apply to Cs-134. In the national milk samples, representative of the northern, eastern, southern and western parts of the Netherlands, average concentrations were: Sr-90: 0.05 +- 0.01 Bq/L and Cs-137: 0.08 +- 0.01 Bq/L. Concentrations of Sr-89, I-131 and Cs-134 were below the limit of detection. From the analysis follows that the detected radionuclides that are of artificial origin are only due to global fall-out from nuclear tests during the sixties and Chernobyl. Only Cs-137 concentrations in pasture are still increased in comparison to pre-Chernobyl values.

 

RIVM - Bilthoven - the Netherlands - www.rivm.nl

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RIVM - Bilthoven - Nederland - www.rivm.nl

( 1991-10-31 )