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Strontium-90 activity concentration in soil samples from the exclusion zone of the Fukushima daiichi nuclear power plant
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Strontium-90 activity concentration in soil samples from the exclusion zone of the Fukushima daiichi nuclear power plant
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Journal Article
Strontium-90 activity concentration in soil samples from the exclusion zone of the Fukushima daiichi nuclear power plant
2016
Overview
The radioactive fission product
90
Sr has a long biological half-life (˜18 y) in the human body. Due to its chemical similarity to calcium it accumulates in bones and irradiates the bone marrow, causing its high radio-toxicity. Assessing
90
Sr is therefore extremely important in case of a nuclear disaster. In this work 16 soil samples were collected from the exclusion zone (<30 km) of the earthquake-damaged Fukushima Daiichi nuclear power plant, to measure
90
Sr activity concentration using liquid scintillation counting.
137
Cs activity concentration was also measured with gamma-spectroscopy in order to investigate correlation with
90
Sr. The
90
Sr activity concentrations ranged from 3.0 ± 0.3 to 23.3 ± 1.5 Bq kg
−1
while the
137
Cs from 0.7 ± 0.1 to 110.8 ± 0.3 kBq kg
−1
. The fact that radioactive contamination originated from the Fukushima nuclear accident was obvious due to the presence of
134
Cs. However,
90
Sr contamination was not confirmed in all samples although detectable amounts of
90
Sr can be expected in Japanese soils, as a background, stemming from global fallout due to the atmospheric nuclear weapon tests. Correlation analysis between
90
Sr and
137
Cs activity concentrations provides a potentially powerful tool to discriminate background
90
Sr level from its Fukushima contribution.
Publisher
Nature Publishing Group UK,Nature Publishing Group
