Lu Xinwei, Zhang Xiaolan
School of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, People's Republic of China.
Radiat Prot Dosimetry. 2008;130(3):385-8. doi: 10.1093/rpd/ncn053. Epub 2008 Mar 6.
The natural radioactivity of (226)Ra, (232)Th and (40)K was determined for beach sand samples collected from Rizhao bathing beach, China, using gamma ray spectrometry. The measured activity in beach sand ranges from 7.6 to 17.2, 7.8 to 25.1 and 883.4 to 1313.6 Bq kg(-1) for (226)Ra, (232)Th and (40)K with mean values of 12.0, 15.2 and 1079.2 Bq kg(-1), respectively. The activity concentrations of (226)Ra and (232)Th in beach sands are lower, while (40)K is higher than the world average. The radium equivalent activity in all beach sand samples is lower than the safe limit set in the OECD report (370 Bq kg(-1)). The values of the external hazard index are less than unity. The mean outdoor air absorbed dose rate is 59.8 nGy h(-1) and the corresponding outdoor effective dose rate is 0.073 mSv y(-1).
利用伽马射线能谱法测定了从中国日照海水浴场采集的海滩砂样品中（226）镭、（232）钍和（40）钾的天然放射性。海滩砂中（226）镭、（232）钍和（40）钾的测量活度范围分别为7.6至17.2、7.8至25.1和883.4至1313.6贝可勒尔每千克，平均值分别为12.0、15.2和1079.2贝可勒尔每千克。海滩砂中（226）镭和（232）钍的活度浓度较低，而（40）钾高于世界平均水平。所有海滩砂样品中的镭当量活度均低于经合组织报告设定的安全限值（370贝可勒尔每千克）。外照射危害指数值小于1。室外空气吸收剂量率平均值为59.8纳戈瑞每小时，相应的室外有效剂量率为0.073毫希沃特每年。
