海南部分地区土壤样品中放射性水平调查

目的 对海南部分地区土壤样品中的放射性水平进行评估。方法 在2012年期间,为了评估土壤中放射性,在中国海南省收集表层土壤样品。用低本底高纯锗γ谱仪测量了15个土壤样品中的放射性。结果 样品中²²⁶Ra、²³²Th和⁴⁰K的平均放射性浓度分别为(26.3±1.0),(23.7±0.90)和(366.1±13.4) Bq·kg^-1。而¹³⁷Cs的活度浓度变化范围值< 0.35 Bq·kg^-1(最小可探测活度浓度)到2.25 Bq·kg^-1。通过使用土壤样品中²²⁶Ra、²³²Th和⁴⁰K的数据结果推算户外空气中γ剂量率值为(41.7±1.5) nGy·h^-1。土壤中放射性核素所致居民人均外照射年有效剂量为0.05 mSv。结论 土壤样品分析结果表明,所有调查点的测量结果属正常环境水平,未见异常。

Assessment of Radionuclide Level in Soil Samples for Partial Areas of Hainan,China

Objective To evaluate the level of radioactivity in soil samples in some area of Hainan.Methods During 2012, topsoil samples were collected from China's Hainan Province, in order to evaluate their radioactivity. The radioactivities of 15 soil samples have been measured with a low-background high-purity germanium gamma spectroscopy.Results In the samples,the average activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K were (26.3±1.0),(23.7±0.9) and (366.1±13.4) Bq·kg^-1, respectively. And the activity concentration of ¹³⁷Cs was found to vary from < 0.35 (minimum detectable activity concentration) to 2.25 Bq·kg^-1. By using the results of ²²⁶Ra, ²³²Th and ⁴⁰K in the sampled soils, the average outdoor gamma dose rate in air was calculated as(41.7±1.5) nGy·h^-1. Furthermore, the average outdoor annual effective dose from terrestrial radiation was 0.05 mSv.Conclusion The results of soil sample analysis show that the measurement results of all the points are normal.