Monitoring of radioactivity in "industrial milk" from the northern, eastern, southern and western parts of the Netherlands as well as in pasture grass and milk from the vicinity of nuclear installations in 1990

Abstract niet beschikbaarMeasurements 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.VH