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用γ谱方法测定了南极长城站附近特有生物群落栖息地沉积物中放射性核素含量,地表沉积物中40K,137Cs,210Pb,226Ra,228Ra,228Th.和238U平均比活度,分别为143,7.56,24.1,3.65,5.36,4.15和6.5 Bq/kg.同时测试了阿德雷岛企鹅栖息地粪土沉积地层中放射性核素含量,利用其中的210Pb比活度,210Pbex垂向变化特征,推演沉积物的沉积速率和地质历史年代:其中AD1-a柱样时间跨度约为74 a(1928~2002年),据此计算了沉积速率为0.063 mm/a(r=0.794),并讨论了在南极特定条件下,放射性核素示踪对定年影响以及与区域现代气候环境变化的内在联系.
The radionuclide contents of sediments in the habitats of endemic biological communities near the Great Wall Station in Antarctica were measured by γ-ray spectrometry. The average specific activities of 40K, 137Cs, 210Pb, 226Ra, 228Ra, 228Th and 238U in surface sediments were 143, 7.56, 24.1, 3.65, 5.36, 4.15 and 6.5 Bq / kg, respectively. Meanwhile, the radionuclide content in the sediment of the penguin habitat of Adelaide Island was also tested. Based on the 210Pb specific activity and 210Pbex vertical variation, Sedimentation rate and geologic history of AD1-a samples are about 74 years (1928-2002), and the sedimentation rate is calculated as 0.063 mm / a (r = 0.794) Under certain conditions, the impact of radionuclide tracing on dating and the inherent relationship with the changes of modern climate and environment in the region.