Concentration of Radioactive Cesium in Imported Foods and Contribution by Chernobyl Reactor Accident

Title: Concentration of Radioactive Cesium in Imported Foods and Contribution by Chernobyl Reactor Accident

Author: Kazuyoshi FUKUDA

Reference: RADIOISOTOPES, Vol. 49 (2000) No. 9 P 433-438

DOI: http://dx.doi.org/10.3769/radioisotopes.49.433

Keywords: radioactive cesium, potassium-40, imported food, Chernobyl reactor accident

Abstract: Radionuclides in imported foods consumed in Hokkaido were examined by germanium (Ge) gamma-ray spectrometer system.
The values of radioactive cesium (¹³⁷Cs+¹³⁴Cs) concentration of 480 samples collected during 1989-1999 were lower than the temporary limit (370Bq/kg) . These values of 441 samples (92%) were lower than 1 Bq/kg. The maximum values of ¹³⁷Cs and ¹³⁴Cs were 62.4Bq/kg, 3.8Bq/kg in black tea imported from China.
From the relation between concentration of ¹³⁷Cs and cesium unit, the contribution from Chernobyl reactor accident was estimated qualitatively on 24 samples with higher values than 0.40Bq/g-K. Based on the concentration of ¹³⁴Cs and ¹³⁷Cs detected in 16 samples, the contribution of ¹³⁷Cs from this accident were calculated.

ＵＲＬ：https://www.jstage.jst.go.jp/article/radioisotopes1952/49/9/49_9_433/_article

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