Sources and reserves of artificial radionuclides (237Np, 239,240Pu, 241Am) in soils of Changbai Mountain
PHD Chunping Huang1,2, Prof Zhiyong Liu2, Prof. Yongjing Guan1, Mr Deyu Wang1,2, Mr Shenzhen Wang1,2, Mr Shaohan Sun1
1Guangxi University, Nanning, China, 2Soochow University, Suzhou, China
Changbai Mountain, as the highest mountain system in Northeast Asia, has attracted much attention to its ecological changes. Artificial radionuclides in the surface environment are an important part of the assessment of environmental radioactivity risk. In this paper, artificial radionuclides (237Np, 239,240Pu, 241Am) in Changbai Mountain were measured by ICP-MS for the first time, and 137Cs were measured by anti-Compton HPGe. The results indicated that 137Cs activity ranges from 3.124 to 17.98 mBq/g, 237Np activity ranges from 0.318 to 4.016 mBq/kg, 239+240Pu activity ranges from 0.345 to 3.122mBq/g, and 241Am activity ranges from 0.479 to 1.096mBq/g, such high specific activity was very rare in samples from other regions in China. The 240Pu/239Pu (0.172-0.256) and 237Np/239Pu (0.136-0.584) atom ratios in our research samples show that the Pu and Np is from global fallout. The deposition characteristics of cesium, plutonium and neptunium were fitted by convective- dispersion equation model. By calculation, the accumulated inventory of 137Cs, 237Np, 239+240Pu is consistent with the global settlement value.
Guan Yongjing, professor at the College of Physical Science and Engineering Technology, Guangxi University. My research interests include AMS detection method, actinide measurement and application. Recent research interest is the distribution and influencing factors of artificial actinides such as 237Np ,236U, 241Am and 239,240 Pu in the environment.