摘要
环境γ能谱测量是电离辐射环境测量中高效、准确、经济的方法。本文详述了NaI(Tl)γ能谱仪在地表γ空气吸收剂量率测量中的仪器刻度、活度浓度和剂量率计算、数据处理和成图的方法技术。用中国核工业航测遥感中心的5个标准源模型对1台就地NaI(Tl)γ谱议进行了实验刻度,采用三元素法和总计数率法对广东珠海市110 km2的大面积环境地面1 m高处的吸收剂量率进行测量和计算结果表明,在满足半无限(2π)测量条件下,按γ能谱数据计算的地表1 m高处空气吸收剂量率与高气压电离室实测结果在±15%以内符合。
Gamma-ray spectrometry is an efficient, accurate and economic method for estimating radioactivity level in environmental monitoring. This paper presents in detail techniques of calibration, calculating air-absorbed dose rate and radioactivity of radionuclides, data processing and mapping contour map of air-absorbed dose rate by in-situ gamma-ray spectrometry. The measuring resalts are analyzed and compared from in-situ gamma-ray spectrometry, in-situ dose rate meter and high pressure ionization chamber. Calculated air-absorbed dose rates at one meter above ground are coincided with data measured by high pressure ionization chamber. The relative error is under±15%.
出处
《辐射防护》
CAS
CSCD
北大核心
2005年第6期347-356,共10页
Radiation Protection
基金
国家自然科学基金资助(项目编号40274023)
中国地质调查局资助(项目编号200214100025)
关键词
Γ能谱
吸收剂量率
环境评价
珠海
Gamma-my Spectrometry, Air-Absorbed Dose Rate, Environmental Estimation, Zhuhai
