Author(s)

Jun Li^2*, Bangqi Hu¹, Jingtao Zhao¹, Fenglong Bai¹, Yanguang Dou¹, Libo Wang¹, Liang Zou¹, Xue Ding¹

¹Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology of Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, China.
²Laboratory for Marine Mineral Resources, Qingdao National Laboratory of Marine Science and Technology, Qingdao, China.

Natural radioactivity is very important for the assessment of the marine sand property and usability. By using gamma spectrometry, the concentration of the natural radionuclides ²²⁶Ra, ²³²Th and ⁴⁰K have been measured in marine sand deposits from Liaodong Bay (LDB), North Yellow Sea (NYS), Zhoushan area (ZS), Taiwan Shoal (TS) and Pearl River Mouth (PR), offshore China, which are potential marine sand mining areas. The radiation activity equivalent (Raeq), indoor gamma absorbed dose rate (DR), annual effective dose (HR), alpha index (Ia), gamma index (Ig), external radiation hazard index (Hex), internal radiation hazard index (Hin), representative level index (RLI), excess lifetime cancer risk (ELCR) and annual gonadal dose equivalent (AGDE) associated with the natural radionuclides are calculated to assess the radiation hazard of the natural radioactivity in the marine sands offshore China. From the analysis, it is found that these marine sands are safe for the constructions. The Pearson correlation coefficient reveals that the ²²⁶Ra distribution in the marine sands offshore China is controlled by the variation of the ⁴⁰K concentration. Principal component analysis (PCA) yields a two-component representation of the entire data from the marine sands, wherein 98.22% of the total variance is explained. Our results provide good baseline data to expand the database of radioactivity of building materials in China and all over the world.

Natural Radioactivity, Radiation Hazard, Principal Component Analysis, Gamma Spectrometry, Marine Sand, Offshore China

Li, J. , Hu, B. , Zhao, J. , Bai, F. , Dou, Y. , Wang, L. , Zou, L. and Ding, X. (2017) Evaluation of Natural Radioactivity in Marine Sand Deposits from Offshore China. Open Journal of Marine Science, 7, 357-378. doi: 10.4236/ojms.2017.73026.