毕业论文移动版

摘要近年随着生活水平的提高，环境安全受到社会各界的普遍关注。氡气作为天然存在的放射性气体，广泛存在于环境土壤、空气、水体中，UNSCEAR在报告中对世界范围的室内氡水平的估计值为19.98Bq/m3，约占正常地区人类所受全部天然辐射年有效剂量的一半以上。因此，有效测量环境氡浓度成为关注焦点。利用超低本底液闪探测器能够测量较低水平的氡浓度，并能够有效保证测量数据的稳定性。63958

通过使用超低本底液闪探测器测量稀土废渣析出氡浓度所得数据的分析、研究得出以下结论：

1.与使用低本底γ探测器测量氡浓度相比，超低本底液闪探测器在相同情况下测量所得到的数据稳定性更好。

2.闪烁液直接吸附氡气比活性炭间接吸附具有更高的吸附效率，且所得数据更加精确。

关键词  超低本底液闪  吸附  氡浓度  

毕业论文 外 文 摘 要

Title    Liquid scintillation measurements of radon and its influencing factors                                                                      

Abstract In recent years, with the improvement of living standards, People are more and more concern about environmental safety . Radon as a natural Radioactive gas, widely exists in the environment of soil, air, water. estimation of UNSCEAR in the report indoor radon level value on the world is 19.98Bq/m3, accounting for about half of the normal human beings from all areas of natural radiation effective dose. Therefore, the effective measurement of environmental radon concentration to become the focus of attention. Using ultra low-background liquid scintillation detector is able to measure radon concentration at a low level, and can effectively ensure the stability of measurement data.

Use the ultra low-background liquid scintillation to measure radon,which is separate out by the rare-earth waste. According to the data of radon concentration, we can get the following conclusions:

1. In the same situation , ultra low-background liquid scintillation have a stable date, compared with using low background gamma detector in measuring radon concentration .

2. Scintillation liquid direct adsorption of radon has a higher adsorption efficiency than activated carbon indirect adsorption, and the data is more accurate.

Keywords   Ultra low-background liquid scintillation   adsorption Radon concentration

 1.绪论 1

1.1课题的意义 1

1.2氡的基本性质简介 1

1.3氡测量方法发展现状 3

1.4本文的主要工作 5

2．液闪测氡的原理及操作流程 6

2.1 仪器原理简介 6

2.2运行环境要求及主要测量参数 7

2.2.1.电源系统 7

2.2.2.运行环境 7

2.3基本操作步骤 7

2.3.1开机流程 7

2.3.2WinQ控制软件的使用 8

2.3.3关机 13

3.活性炭吸附曲线的测定 14

3.1活性炭吸附原理 14

3.2实验试剂及器材 14 (责任编辑：qin)