GEOCHEMICAL STUDIES OF U, TH, RA, 40K IN SECIMENTS OF THE CHINA SEA AND ADJACENT SEA AREA, AND LOWER REACHES OF SEVERAL CHINESE RIVERS

作     者：李培泉 刘志和 Li Peiquan(Institute of Oceanology, Academia Sinica, Qingdao)Liu Zhihe(Shandong Institute of Medical Science, Jinan)

作者机构：Institute of Oceanology Academia Sinica Qingdao Shandong Institute of Medical Science Jinan 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报(英文版))

年 卷 期：1987年第5卷第2期

页      面：109-117页

学科分类：0710[理学-生物学] 1002[医学-临床医学] 0908[农学-水产] 0707[理学-海洋科学] 0815[工学-水利工程] 100214[医学-肿瘤学] 10[医学] 

主　　题：Th Ra AND LOWER REACHES OF SEVERAL CHINESE RIVERS GEOCHEMICAL STUDIES OF U K IN SECIMENTS OF THE CHINA SEA AND ADJACENT SEA AREA SEA RA 

摘      要：Geochemical studies of the U, Th, Ra, and 40K in surface sediments of the China Sea and adjacent sea areas, the lower reaches of the Huanghe and Changjiang Rivers and the estuaries of the Zhujiang and Rongjiang Rivers were carried out with a model 8180-4K multichannel Ge(Li)y spectrometer in 1981-1985. The .mean values of U, Ra, Th, 40K are about 2.11 ppm, 7.67×10-13g/g, 11.00 ppm, and 2.33 ppm respectively, in the China Sea, the Okinawa Trough, and the Changjiang and Huanghe River estuaries. The distribution of the four isotopes is uniform in the above *** contents of U and Th in the sediments of the Zhujiang and Rongjiang Rivers and the Fujian coast are 1-4 times higher than those of the above zone and are related to the granite and radioactive ore present in the upper reaches of these rivers or the adjacent *** distributions of U, Th, Ra, and 40K are related to the physico-chemical property, redox state, geological type and grain size of the sediment, and biotic activity.