Comparison of Depth Profiles of 129 I and 14 C Concentration in the Surface Layer of Soils Collected from Northeastern Japan
Bibliographic Data
| ID | 9243789 |
|---|---|
| Authors | Hiroyuki Matsuzaki (0000-0001-8521-3029), Yoko Sunohara Tsuchiya, Yasuyuki Muramatsu, Yuji Maejima, Yosuke Miyairi (0000-0003-3428-5342), Kazuhiro Kato (0000-0001-6168-5208) |
| Year | 2010 |
| Volume | 52 |
| Issue | 3 |
| Pages | 1487-1497 |
| Publication date | 2010-01-01 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/s0033822200046579 |
| OpenAlex | W2203214195 |
| Language | EN |
| References cited | 9 |
129 I/ 127 I and 14 C/ 12 C depth profiles were compared for the surface 30-cm layer of soil samples (Andisols) collected from Shimokita Peninsula, northeastern Japan, in November 2005. The 129 I/ 127 I and 14 C/ 12 C profiles have a clear correlation, even taking into account that the data include samples collected from different sites with different surface histories. These results, and considering that 14 C/ 12 C can be regarded as a proxy of the original depth in stable soil, show the diversity of the 129 I/ 127 I ratio at the surface among the sites, indicating variations in the thicknesses of the layers recently removed. At one of the sampling sites (P003-1), the Δ 14 C value measures ∼110‰ near the surface, which is indicative of anthropogenic 14 C produced by atmospheric testing of nuclear weapons during the late 1950s and early 1960s. This site has experienced no disturbances for at least the past 50 yr. The relatively high activity of 129 I (0.8 mBq/kg) and the 129 I/ 127 I ratio (7 x 10 –9 ) observed at the top layer of this site can be considered a “representative value” when considering the anthropogenic iodine transfer from the atmosphere to the ground. The observations also support 2 separate modes of 129 I migration in the soil: i.e. “topmost quick diffusion” and “subsurface relatively slow migration process.” Even in the “subsurface relatively slow migration zone,” the 129 I/ 127 I ratio was still orders higher than the pre-anthropogenic natural level
Atmospheric sciences · Geography · Meteorology · Mineralogy · Soil horizon · Soil water · Surface layer · Uranium · Chemistry · Environmental Science · Geology and Paleoclimatology Research · Materials Science · Radioactive contamination and transfer · Radioactivity and Radon Measurements · Environmental Chemistry · Geology · Soil Science
| Citation velocity | historical |
|---|---|
| Highly cited | No |