October 2006:
The Second Asian and Oceanic Congress on Radiological Protection (AOCRP-2)
      Beijing
March 2008:
Working visit on the radiation measurements in the transport of NORM and meetings with Radiation Health Unit in HK
      Hong Kong, Xiamen
April 2013:
Naturally Occurring Radioactive Material (NORM-VII) symposium
      Beijing
November 2013:
Titanium and Zirconium Minerals Industry (TZMI) annual conference
      Hong Kong
2013 - 2019:
      Beijing - 4 stopovers, Hong Kong - 8 stopovers