Radiostrontium activity concentrations in milk in the republic of Croatia for 1961-2001 and dose assessment.
Results of systematic measurements of 90Sr activity concentrations in milk for the period 1961-2001 are summarized. An exponential decline of radioactivity followed the moratorium on atmospheric nuclear testing. The highest activity of 90Sr deposited by fallout, 1,060 Bq m(-2), was recorded in 1963, while the peak 90Sr activity concentration in milk, 1.42 +/- 0.17 Bq L(-1), was recorded in 1964. The values in year 2001 for fallout deposition and milk were 7.7 Bq m(-2) and 0.07 +/- 0.03 Bq L(-1), respectively. The reactor accident at Chernobyl caused higher 90Sr levels only in 1986. 90Sr fallout activity affects milk activity; the coefficient of correlation between 90Sr fallout activity and 90Sr activity concentrations in milk is 0.80. The transfer coefficient from fallout deposition to milk was estimated to be 2.5 x 10(-3) Bq y L(-1) per Bq m(-2). The dose incurred by milk consumption was estimated for the Croatian population, the annual collective effective dose in 2001 being approximately 2.0 person-Sv.
Franić
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Z
Institute for Medical Research and Occupational Health, Ksaverska cesta 2, PO Box 291, HR-10001 Zagreb, Croatia. franic@franic.info
Lokobauer
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N
Marović
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G
D000293:Adolescent; D000328:Adult; D000818:Animals; D002648:Child; D002675:Child, Preschool; D017523:Croatia; D004307:Dose-Response Relationship, Radiation; D005507:Food Contamination, Radioactive / Q000706:statistics & numerical data*; D006207:Half-Life; D006801:Humans; D007223:Infant; D008892:Milk / Q000737:chemistry*; D018788:Radioactive Hazard Release; D013326:Strontium Radioisotopes / Q000032:analysis* / Q000493:pharmacokinetics; D013997:Time Factors
D013326:Strontium Radioisotopes