Distribution of nuclear bomb Pu in Nishiyama area, Nagasaki, estimated by accurate and precise determination of 240Pu/239Pu ratio in soils

Yoshida, Satoshi; Muramatsu, Yasuyuki; Yamazaki, Shinnosuke; Ban-Nai, Tadaaki

doi:10.1016/j.jenvrad.2007.01.019

Cited by 19 publications

(9 citation statements)

References 11 publications

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“…Therefore, the 240 Pu/ 239 Pu atom ratio can provide valuable information on the nature of the Pu emitting source1314. In previous investigations to obtain the background data for Pu in Japanese soil, the 240 Pu/ 239 Pu atom ratio was found to be in the range of 0.14–0.24, which revealed that the major source of Pu in the environment was global fallout from the atmospheric nuclear explosions conducted in the last century9101112131415.…”

mentioning

confidence: 99%

Plutonium concentration and isotopic ratio in soil samples from central-eastern Japan collected around the 1970s

Yang¹,

Zheng²,

Tagami³

et al. 2015

Sci Rep

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Obtaining Pu background data in the environment is essential for contamination source identification and assessment of environmental impact of Pu released from the Fukushima Daiichi nuclear power plant (FDNPP) accident. However, no baseline information on Pu isotopes in Fukushima Prefecture has been reported. Here we analyzed 80 surface soil samples collected from the central-eastern Japan during 1969–1977 for 239+240Pu activity concentration and 240Pu/239Pu atom ratio to establish the baseline before the FDNPP accident. We found that 239+240Pu activity concentrations ranged from 0.004 –1.46 mBq g−1, and 240Pu/239Pu atom ratios varied narrowly from 0.148 to 0.229 with a mean of 0.186 ± 0.015. We also reconstructed the surface deposition density of 241Pu using the 241Pu/239Pu atom ratio in the Japanese fallout reference material. The obtained results indicated that, for the FDNPP-accident released 241Pu, a similar radiation impact can be estimated as was seen for the global fallout deposited 241Pu in the last decades.

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mentioning

confidence: 99%

Plutonium concentration and isotopic ratio in soil samples from central-eastern Japan collected around the 1970s

Yang¹,

Zheng²,

Tagami³

et al. 2015

Sci Rep

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“…2.2 × 10 -5 This study NIST-4357 ocean sediment and IAEA-446 seaweed were analyzed for Pu isotopes. The results we obtained are compared with the certified and previously reported values [22,[30][31][32][33]. Table 4 summarized the analytical results of activities of 239+240 Pu and 241 Pu, and atom ratios of 240 Pu / 239 Pu and 241 Pu/ 239 Pu.…”

Section: Determination Ofmentioning

confidence: 66%

“…For NIST-4357, we also measured 241 Pu activity and 241 Pu/ 239 Pu atom ratio. Although the atom ratios of 240 Pu/ 239 Pu and 241 Pu/ 239 Pu, and the activity of 241 Pu were not certified for NIST-4357, they were reported in the literature [22,[30][31][32][33]. In this study, the mean (n = 5) atom ratios of 240 Pu/ 239 Pu and 241 Pu/ 239 Pu, and the activ-ity of 241 Pu were 0.238 ± 0.002, 0.0130 ± 0.0006, and 124.1 ± 14.9 mBq g -1 , respectively, which were comparable with the literature values.…”

Section: Determination Ofmentioning

confidence: 99%

Evaluation of a new sector-field ICP-MS with Jet Interface for ultra-trace determination of Pu isotopes: from femtogram to attogram levels

Zheng

2015

J. Nucl. Radiochem. Sci.

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In March 2014, a new sector-field (SF)-ICP-MS (Element XR) equipped with the Jet Interface was installed in the Research Center for Radiation Protection at the National Institute of Radiological Sciences (NIRS). This is the first Element XR installed for actinides measurements in Japan. In this paper, a detail evaluation is made of the Element XR on its analytical potential for ultra-trace determination of Pu isotopes. In order to enhance the sensitivity for Pu isotope analysis, high efficiency sample introduction systems (APEX-Q and Aridus II) were combined with the Element XR. A certified Pu isotope standard solution (NBS 947) and a multi element standard solution (Merck Multi Element Standard), which contained depleted U, were used to investigate four items: the formation rate of 238 UH + , which could interfere with an ultra-trace level 239 Pu determination; the detection limit for Pu; the precision and accuracy for 240 Pu/ 239 Pu atom ratio measurement; and the long-term (8-month) stability for Pu isotope composition analysis. Due to the exceptionally high sensitivity of the new SF-ICP-MS, a detection limit at the attogram (10-18 g) level was achieved. This is comparable to or even surpasses the detection limit of accelerator mass spectrometry, which has long been regarded as the most sensitive technique for Pu isotope measurement.

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“…Continuous monitoring of the 239+240 Pu activity in Nishiyama soils, [151][152][153][154][155][156] disclosed the fact that high concentration of Pu remained in the uncultivated soils. The contribution of Nagasaki atomic bomb source Pu to the total deposition was estimated from determination of the 240 Pu/ 239 Pu atom ratio in soils and in sediment core samples using ICP-MS. 154,155 An investigation of the geographical distribution of bomb-derived Pu in the eastern area of Nagasaki, carried out by ICP-MS analysis for the 240 Pu/ 239 Pu atom ratio, revealed that Pu from the atomic bomb fallout was deposited from the hypocenter to points 100 km eastwards. 155 Regarding the mobility of Pu in the soil, Mahara and Miyahara 157 studied the residual Pu downward migration in soil, and found that only 3% of the total Pu in the soil was dispersed over a 0.3 to 2.25 m depth, ca.…”

Section: Nagasaki and Hiroshima Atomic-bomb Detonation In 1945mentioning

confidence: 99%

The key role of atomic spectrometry in radiation protection

Zheng¹,

Tagami²,

Homma-Takeda³

et al. 2013

J. Anal. At. Spectrom.

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Distribution of nuclear bomb Pu in Nishiyama area, Nagasaki, estimated by accurate and precise determination of 240Pu/239Pu ratio in soils

Cited by 19 publications

References 11 publications

Plutonium concentration and isotopic ratio in soil samples from central-eastern Japan collected around the 1970s

Plutonium concentration and isotopic ratio in soil samples from central-eastern Japan collected around the 1970s

Evaluation of a new sector-field ICP-MS with Jet Interface for ultra-trace determination of Pu isotopes: from femtogram to attogram levels

The key role of atomic spectrometry in radiation protection

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