Shibata Setsuko, Kawano Eiko, Nakabayashi Takeshige
Research Center for Radiation and Radioisotopes, Osaka Prefecture University, 1-2 Gakuen-cho, Sakai, Osaka 5998570, Japan.
Appl Radiat Isot. 2005 Aug;63(2):285-90. doi: 10.1016/j.apradiso.2005.03.011.
(14)C in rice grains is a useful tracer of atmospheric (14)C(CO(2)). (14)C measurement in rice grains for 17 years during 1982--1999 reveals the following. There is negative correlation between Delta(14)C and the population densities of localities in Japan. Under-populated areas in the northern area of Japan and Okinawa remained clean in the 1990s. The (14)C(CO(2)) decline rates at those areas are near to that of Shauinsland. A latitudinal effect due to Chinese nuclear tests is observed in 1982. Small Seuss effects is observed at the middle latitudes in East Asia after 1995.
水稻籽粒中的碳-14是大气中碳-14二氧化碳的有效示踪剂。对1982年至1999年期间17年的水稻籽粒进行碳-14测量，结果如下。日本当地的δ¹⁴C与人口密度之间存在负相关。日本北部和冲绳的人口稀少地区在20世纪90年代仍保持清洁。这些地区的碳-14二氧化碳下降速率接近绍因斯兰岛的下降速率。1982年观察到由于中国核试验产生的纬度效应。1995年后在东亚中纬度地区观察到小苏斯效应。
