Xinwei Lu
College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, PR China.
Health Phys. 2005 Jan;88(1):84-6. doi: 10.1097/01.hp.0000142498.08451.c8.
This note presents a study of 226Ra, 232Th, and 40K in cement and its products manufactured in some areas of Shaanxi, China. The concentrations of 226Ra, 232Th, and 40K were 46.2, 28.4, and 137.4 Bq kg(-1), respectively, for cement brick; and 64.7, 48.7, and 161.3 Bq kg(-1), respectively, for cement plaster. The concentration of 226Ra, 232Th, and 40K in cement ranges from 34.7 to 68.3 Bq kg(-1) with a mean value of 56.5 Bq kg(-1), 18.5 to 51.7 Bq kg(-1) with a mean value of 36.5 Bq kg(-1), and 126.8 to 224.6 Bq kg(-1) with a mean value of 173.2 Bq kg(-1), respectively. The measured activity concentrations for these radionuclides were compared with the reported data of other countries. The radium equivalent activities (Raeq), external hazard index (Hex) and internal hazard index (Hin) associated with the radionuclides were calculated. The Raeq values of cement and cement products are lower than the limit of 370 Bq kg(-1), equivalent to a gamma dose of 1.5 mSv y(-1). The values of Hex and Hin are less than unity.
本报告介绍了对中国陕西部分地区生产的水泥及其制品中226Ra、232Th和40K的研究。水泥砖中226Ra、232Th和40K的浓度分别为46.2、28.4和137.4 Bq kg(-1)；水泥灰泥中分别为64.7、48.7和161.3 Bq kg(-1)。水泥中226Ra、232Th和40K的浓度范围分别为34.7至68.3 Bq kg(-1)，平均值为56.5 Bq kg(-1)；18.5至51.7 Bq kg(-1)，平均值为36.5 Bq kg(-1)；126.8至224.6 Bq kg(-1)，平均值为173.2 Bq kg(-1)。将这些放射性核素的测量活度浓度与其他国家报告的数据进行了比较。计算了与放射性核素相关的镭当量活度（Raeq）、外照射危害指数（Hex）和内照射危害指数（Hin）。水泥和水泥制品的Raeq值低于370 Bq kg(-1)的限值，相当于1.5 mSv y(-1)的伽马剂量。Hex和Hin值均小于1。
