Supported by the National Basic Research Program of China (Grant No. 2005CB422002);the Innovation Program of Chinese Academy of Sciences (Grant No. KZCX3-SW-339);the National Natural Science Foundation of China (Grant Nos. 40121101 and 40571039);the Ministry of Science and Technology of China (Grant No. 2001CCB00300)
The total activity variation with depth from a 41.6 m Muztagata ice core drilled at 7010 m, recorded not only the 1963 radioactive layer due to the thermonuclear test, but also clearly the radioactive peak released by...