深圳市大气沉降灰中放射性核素γ能谱分析研究

目的 通过对深圳市2013—2014年大气沉降灰中放射性核素进行γ能谱分析，了解大气沉降灰中各种放射性核素的含量，为日常及核应急情况下大气放射性监测提供科学依据。方法 根据《辐射环境检测技术规范》，采用干沉降的采样方法进行采样，根据《生活饮用水标准检验方法放射性指标》（GB/T 5750.13-2006），利用γ能谱进行样品的核素分析。结果 大气沉降灰中主要有天然放射性核素²³⁸U、²²⁶Ra、²³²Th、⁴⁰K、⁷Be，并未检出人工核素。结论 此次研究结果与深圳市疾控中心（1993—2005）和广东省辐射监测中心（2007—2010）的监测结果相当，且数据随时间的变化趋势一致，属于正常范围。

Study on radionuclides in air fallout analyzed by gamma spectrometry in Shenzhen

Objective Based on the gamma spectrometry analysis of the radionuclides in the air fallout in Shenzhen between 2013 and 2014, to learn the contents of different kinds of radionuclides in the air fallout, providinge a scientific basis for the daily and nuclear emergency monitoring of the atmospheric radioactivity. Methods Dry deposition was selected and sampled in the method based on "The Environmental Air Quality Monitoring Specifications". Gamma spectrometry analysis was conducted on the samples collected according to "The Standard Testing Method for Drinking Water-Radioactivity Index (GB/T 5750.13-2006)". Results Natural radionuclides ²³⁸U, ²²⁶Ra, ²³²Th, ⁴⁰K, and 7Be were detected in the air fallout. No artificial radionuclides were found. Conclusion The results are comparable to those aquired by the CDC of Shenzhen (1993-2005) and the Guangdong Environmental Radiation Monitoring Center (2007-2010). Their data share the consistent variation tendency, and falls within the normal range.