A pilot study for dose evaluation in high-level natural radiation areas of Yangjiang, China

作者：Omori Yasutaka; Tokonami Shinji^*; Ishikawa Tetsuo; Sahoo Sarata Kumar; Akata Naofumi; Sorimachi Atsuyuki; Hosoda Masahiro; Pornnumpa Chanis; Wanabongse Paitoon; Kudo Hiromi; Hu Ye Jing; Ao Yong Xiang; Li Xiao Liang; Li Kun; Fu Ying Hua; Sun Quan Fu; Akiba Suminori

来源：Journal of Radioanalytical and Nuclear Chemistry, 2015, 306(1): 317-323.

DOI：10.1007/s10967-015-4286-z

• Ambient gamma dose rate
• External exposure
• High background radiation area
• Internal exposure
• Thoron
• Yangjiang

A pilot study to measure ambient gamma dose rate and radon and thoron progeny concentrations was made for eight dwellings selected in Yangjiang, China. Indoor and outdoor ambient gamma dose rates were 110-370 and 100-220 nGy h(-1), respectively. Doses received from indoor terrestrial radiation were estimated to be 0.6-1.8 mSv year(-1). Radon, thoron and thoron progeny concentrations were 19-98, 18-1120 and 0.4-10.3 Bq m(-3), respectively. This pilot study showed that the position of passive-type monitors to be placed and the deployment period should be carefully determined for estimating reliable annual average concentrations.

• 出版日期2015-10
• 单位中国疾病预防控制中心; 中国疾病预防控制中心辐射防护与核安全医学所