中国锦屏地下实验室极低本底装置屏蔽和氡及子体影响研究
发布时间：2018-08-19 10:19
【摘要】：暗物质得到了国际上很多顶尖科学家的关注,并且提出了一系列测量暗物质的方法,主要包括:间接法和直接法测量暗物质,然而这些测量暗物质的实验方法必须在一个本底非常低的情况下才有可能测量到暗物质,所以世界上有许多实验组为了给测量暗物质提供良好的测量环境都把实验室从地上搬到地下,这样做的主要目的是为了屏蔽宇宙射线的干扰。而我国锦屏地下实验室正好做到了这一点,本次论文主要研究的是屏蔽体材料及大厅中的氡浓度对极低本底装置的影响,本论文研究了以下几点:(1)本文研究了铅铜屏蔽体中放射性核素对极低本底装置的影响,分别模拟了铅、铜中238U系、232Tu系、40K对极低本底装置的影响;(2)本文通过使用Alpha Guard电离室测氡仪测量了实验大厅中的氡浓度,探讨了在其他条件一致的情况下,通风设备对实验大厅中氡浓度的影响,同时用高纯锗探测器测量了低本底装置中的氡及氡子体的γ射线,探讨了实验大厅氡浓度对极低本底装置的影响;(3)根据高纯锗探测器探测出的氡子体214Pb(351.9ke V)的计数率,并根据测量时氡及子体处于长期平衡计算出样品腔中氡含量,根据计算的结果讨论了试验大厅中氡浓度对极低本底装置的影响。
[Abstract]:Dark matter has attracted the attention of many top scientists in the world, and has put forward a series of methods to measure dark matter, including indirect method and direct method. But these methods of measuring dark matter have to be very low in background to make it possible to measure dark matter. So many experimental groups in the world have moved the laboratory from the ground to the ground in order to provide a good measuring environment for the measurement of dark matter. The main purpose of this is to shield against cosmic ray interference. China's Jinping underground laboratory has done just that. This paper mainly studies the effects of shielding materials and radon concentration in the hall on the very low background device. The main contributions of this thesis are as follows: (1) the effects of radionuclides in lead-copper shield on very low background devices are studied. The effect of 238U system 232Tu system 40K on the very low background device; (2) the radon concentration in the experimental hall was measured by using the Alpha Guard ionization chamber instrument, and the effect of ventilation equipment on the radon concentration in the experimental hall was discussed under the same conditions. At the same time, the high purity germanium detector was used to measure the 纬 rays of radon and radon progeny in the low background device, and the effect of radon concentration on the very low background device in the laboratory hall was discussed. (3) according to the counting rate of radon daughter 214Pb (351.9ke V) detected by the high purity germanium detector, The radon content in the sample cavity was calculated according to the long term equilibrium of radon and its progeny, and the effect of radon concentration in the test hall on the very low background device was discussed.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P145.9
本文编号：2191369
[Abstract]:Dark matter has attracted the attention of many top scientists in the world, and has put forward a series of methods to measure dark matter, including indirect method and direct method. But these methods of measuring dark matter have to be very low in background to make it possible to measure dark matter. So many experimental groups in the world have moved the laboratory from the ground to the ground in order to provide a good measuring environment for the measurement of dark matter. The main purpose of this is to shield against cosmic ray interference. China's Jinping underground laboratory has done just that. This paper mainly studies the effects of shielding materials and radon concentration in the hall on the very low background device. The main contributions of this thesis are as follows: (1) the effects of radionuclides in lead-copper shield on very low background devices are studied. The effect of 238U system 232Tu system 40K on the very low background device; (2) the radon concentration in the experimental hall was measured by using the Alpha Guard ionization chamber instrument, and the effect of ventilation equipment on the radon concentration in the experimental hall was discussed under the same conditions. At the same time, the high purity germanium detector was used to measure the 纬 rays of radon and radon progeny in the low background device, and the effect of radon concentration on the very low background device in the laboratory hall was discussed. (3) according to the counting rate of radon daughter 214Pb (351.9ke V) detected by the high purity germanium detector, The radon content in the sample cavity was calculated according to the long term equilibrium of radon and its progeny, and the effect of radon concentration in the test hall on the very low background device was discussed.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P145.9
【参考文献】
相关期刊论文 前1条
1 吴永鹏;汤彬;程建平;梁永顺;王哲;;利用LaBr_3(Ce)伽马谱仪直接测定铀矿体中铀含量的方法[J];物探与化探;2012年03期
，本文编号：2191369
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