English Abstract Measurements of the concentrations in pasture and milk
samples from the surroundings of nuclear installations gave for 1989 the
following average values in pasture: Be-7: 83 +- 6 Bq/kg, K-40: 900 +- 50
Bq/kg, Sr-90: 1,9 +- 0,4 Bq/kg, Cs-137: 2,9 +- 0,6 Bq/kg. Sr-89, I-131 and
Cs-134 were below the limit of detection. Rest-beta-activity and
rest-gamma-activity in pasture were mostly below the limit of detection.
The concentration of the stabile Ca was found to be 4,4 +- 0,2 g/kg.
Average concentrations in milk were: for Sr-90: 0,031 +- 0,002 Bq/L and for
Cs-137: 0,16 +- 0,05 Bq/L. Be-7, Sr-89, I-131 and Cs-134 were below the
limit of detection. In the national milk samples, representative for the
northern, eastern, southern and western parts of the Netherlands, average
concentrations were: Sr-90: 0,04 +-0,01 Bq/L and Cs-137: 0,24 +- 0,01 Bq/L.
Sr-89, I-131 and Cs-134 were not detectable. From the analysis follows that
the detected radionuclides which are of artificial origin are due to global
fallout from nuclear tests during the sixties and Chernobyl. Concentrations
in pasture as well as in milk are almost equal to pre-Chernobyl values.
Only Cs-137 concentrations in pasture are still clearly
higher.
