环境γ辐射剂量率连续监测数据影响因素和特征分析

摘要/Abstract

摘要： 对γ辐射剂量率的连续监测是核电厂常规监测和监督性监测的主要内容。分析γ辐射剂量率连续监测数据的影响因素,对于识别核电厂的异常排放、建立应急监测本底具有重要意义。本文以宁德核电厂监督性监测系统2016年一整年的γ辐射剂量率逐时连续监测数据为例,分析各种可能的影响因素,包括宇宙射线响应、气象参数的影响、核电厂的排放等,研究各种因素的影响特征。结果表明,γ辐射主要来自地表中的天然放射性核素及宇宙射线,气象参数的变化是影响γ辐射剂量率变化的主要因素。结合快速傅里叶分析FFT和气象参数相关性分析,表明γ辐射剂量率连续监测数据存在明显的日周期变化。核事故时释放的放射性可能对剂量率监测结果带来明显的影响。

关键词: γ辐射剂量率, 连续监测, 核电厂, 气象影响

Abstract: Continuous monitoring of γ dose rate is the main item of regular monitoring and supervision monitoring of nuclear power plants. Analysis of influence factors for continuous monitoring data of γ dose rate is important to identify abnormal discharge of nuclear power plants and establish emergency monitoring background. In this paper, various influence factors, including cosmic ray response, meteorological parameters, and discharge from nuclear power plants were studied on the basis of the continuous monitoring hourly data of γ dose rate from a supervision monitoring system of Ningde Nuclear Power Plant in 2016 and the related characteristics were summarized. The study results show that γ radiation mainly comes from natural radioactive isotopes and cosmic rays. The variation of meteorological parameters is the main influence factor on variation of γ dose rate. From the rapid Fourier analysis ( FFT) and the analysis of meteorological parameter relativity, it shows that there is an obvious date-period variation in the data of continuous monitoring of γ dose rate. The radioactivity released from nuclear accidents may also affect the monitoring result of γ dose rate.

Key words: gamma dose rate, continuous monitoring, nuclear power plant, meteorological influence

中图分类号:

TL75

罗敦烨, 沙向东, 上官志洪, 林明贵, 黄彦君, 彭凯. 环境γ辐射剂量率连续监测数据影响因素和特征分析[J]. 辐射防护, 2018, 38(4): 308-318.

LUO Dunye, SHA Xiangdong, SHANGGUAN Zhihong, LIN Minggui, HUANG Yanjun, PENG Kai. Study on influence factors and characteristics of continuousmonitoring data of environmental γ dose rate[J]. RADIATION PROTECTION, 2018, 38(4): 308-318.

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