著者
TAKASHI GAKUHARI HAJIME KOMIYA JUNMEI SAWADA TOMOKO ANEZAKI TAKAO SATO KENICHI KOBAYASHI SHIGERU ITOH KOICHI KOBAYASHI HIROYUKI MATSUZAKI KUNIO YOSHIDA MINORU YONEDA
出版者
日本人類学会
雑誌
Anthropological Science (ISSN:09187960)
巻号頁・発行日
pp.150309, (Released:2015-06-11)
被引用文献数
3 5

Two complete dog skeletons were recovered during archeological excavations from 1961 to 1970 at the Kamikuroiwa rock shelter, a site that yielded a series of cultural entities from the Late Pleistocene, Incipient Jomon, and Early Jomon periods. Since two dogs were buried close to human skeletons, it was thought that these dogs had been buried by Jomon people, and hence provided the oldest direct evidence of Canis domestication in Japan. However, the stratigraphic information and archeological contexts of these dog skeletons are incomplete due to the lack of detailed excavation reports and technical limitations of excavations at this site. Because the date of the dog burials has not been fully discussed in the context of modern chronology or recent discussions on Canis domestication, we directly measured radiocarbon ages and stable isotope analysis on two dog burials and one set of human remains from the Kamikuroiwa rock shelter. These data are important for reconstructing the relationship between humans and dogs in the Jomon period. Our results show that the human thought to have been buried with the dogs was assigned to the middle Initial Jomon period (8977–8725 calBP), whereas, on the other hand, dates for the dog burials are very close to each other and were assigned to the latest Initial Jomon or the initial Early Jomon periods (7414–7273 calBP). Although these results are not consistent with previous archeological interpretations for this site, they remain important because these two dog burials are among the oldest evidence of Canis domestication in East Asia.
著者
Sachi WAKASA Yuri MORIGUCHI Hiroyuki MATSUZAKI Yukinori MATSUKURA
出版者
The Tohoku Geographical Association
雑誌
Kikan Chirigaku (ISSN:09167889)
巻号頁・発行日
vol.60, no.2, pp.69-76, 2008-09-10 (Released:2010-06-22)
参考文献数
18

寝覚ノ床は, 木曽川上流域の長野県木曽郡上松町にある露出花歯岩からなる地形である。本研究では, この寝覚ノ床の露出花崗岩表面の露出年代値を宇宙線生成核種10Beの濃度から推定した。また, 岩盤表面の強度をシュミットハンマーとエコーチップにより測定した。その結果, (1) 寝覚ノ床は約1.2万年前に露出したこと, (2) 河床からの比高が高いところほど風化がより進行していることから, 露出後に徐々に進行した下刻作用によって形成されたと考えられた。さらに, 岩盤表面の河床からの高度と露出年代値から得られた岩盤の平均侵食速度 (下刻速度) は, 1.7m/kyrであり, この値は周囲の平均隆起速度と調和的である。
著者
YASUTO MIYAKE HIROYUKI MATSUZAKI TAKESHI FUJIWARA TAKUMI SAITO TAKEYASU YAMAGATA MAKI HONDA YASUYUKI MURAMATSU
出版者
GEOCHEMICAL SOCIETY OF JAPAN
雑誌
GEOCHEMICAL JOURNAL (ISSN:00167002)
巻号頁・発行日
vol.46, no.4, pp.327-333, 2012-08-20 (Released:2013-11-08)
参考文献数
28
被引用文献数
1 64

In March 2011, there was an accident at the Fukushima Daiichi Nuclear Power Plant (NPP) and a discharge of radionuclides resulting from a powerful earthquake. Considering the impact on human health, the radiation dosimetry is the most important for 131I among radionuclides in the initial stage immediately following the release of radionuclides. Since 131I cannot be detected after several months owing to its short half-life (8 days), the reconstruction by 129I (half-life: 1.57 × 107 yrs) analysis is important. For this reconstruction, it is necessary to know the isotopic ratio of 129I/131I of radioactive iodine released from the NPP. In this study, the 129I concentration was measured in several surface soil samples collected around the Fukushima Daiichi NPP for which the 131I level had already been determined. The surface deposition amount of 129I was between 15.6 and 6.06 × 103 mBq/m2 within the region 3.6 to 59.0 km distant from the NPP. 129I and 131I data had good linear correlation and the average isotopic ratio was estimated to be 129I/131I = 31.6 ± 8.9 as of March 15, 2011.