Air dose rate to 137Cs activity per unit area ratio for different land use 7 years after the nuclear accident -Case of the slope catchment, Ogi reservoir, Fukushima

Basuki, Triyono; Bekelesi, Wiseman; Tsujimoto, Masaya; Nakashima, Satoru

doi:10.1016/j.radmeas.2020.106424

Cited by 4 publications

(2 citation statements)

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“…The soil and sediment core samples were each cut into 2 cm and 1 cm increments to depth of 10 cm and 5 cm, respectively and made 1 composite sample each layer. The soil and sediment samples were firstly air dried for two weeks then passed through 2 mm sieve before they were dried in oven at 105°C for 24 h. Table 1 shows the detailed information of the sampling area 11,15) .…”

Section: Soil and Sediment Samplesmentioning

confidence: 99%

“…Most of the studies on 90 Sr content have only focused near the soil surface, thus not all 90 Sr content present in soil has been measured 10) . On the other hand, depth distribution of 137 Cs in Fukushima soils has been studied by several researchers [11][12][13] . Moreover, there have not been any research aimed to analyze the 90 Sr vertical migration in sediment and horizontal migration from land to water body.…”

Section: Introductionmentioning

confidence: 99%

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Distinction of Migration of Strontium-90 and Cesium-137 for Fukushima Soil and Sediment following the Fukushima Accident

Bekelesi

Basuki

Higaki

et al. 2022

Radiat. Saf. Manage.

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Strontium-90 ( 90 Sr) and cesium-137 ( 137 Cs) were released from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident in March 2011. Strontium-90 concentration in environment was extremely lower than that of 137 Cs in the soil after the FDNPP accident. However, 90 Sr may induce higher risk of health effect to human than 137 Cs by considering longer biological half-life of 90 Sr than 137 Cs. Moreover, there is not sufficient data on 90 Sr horizontal and vertical distribution compared to 137 Cs, which is important for predicting their long-term migration.In the present study, the distribution of 90 Sr and 137 Cs in the soils of Kawauchi and Fukushima paddy rice fields was investigated and the migration of 90 Sr and 137 Cs in Lake Ogi sediment and its forestry catchment area was studied. A rough relation between 90 Sr and 137 Cs levels in soil is shown and such insufficient correlation might be defined by the low 90 Sr concentration and because of global fallout. Furthermore, 90 Sr gave higher coefficient of variation in comparison to 137 Cs, portraying that the movement of 90 Sr is more affected by the environmental factors rather than 137 Cs. The depth dependency of 90 Sr and 137 Cs in Lake Ogi forestry catchment area is shown for both radionuclides, and the activity concentration decreases with the increase of depth. However, the 90 Sr infiltrates more to 10 cm soil profile in contrast to 137 Cs, showing 90 Sr faster vertical migration than 137 Cs. Sediment to soil ratio for 90 Sr reported a higher value than that of 137 Cs, which possibly depicts more horizontal flowing of 90 Sr from forest soil to lake sediment than 137 Cs. Consequently, the higher mobility of 90 Sr than 137 Cs was proposed.

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Section: Soil and Sediment Samplesmentioning

confidence: 99%