Optical Properties and Radiation Detection Properties of Silica Aerogel

YAN Yihong; ZHANG Mei; SHENG Liang; TANG Lingzhi; JI Fu; HE Jiayang; HU Guang; HU Huasi

doi:10.7652/xjtuxb202502013

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Optical Properties and Radiation Detection Properties of Silica Aerogel

更新时间：2026-01-06

- Optical Properties and Radiation Detection Properties of Silica Aerogel
- Journal of Xi’an Jiaotong University Vol. 59, Issue 2, Pages: 127-133(2025)
- 作者机构：
  
  1.西安交通大学能源与动力工程学院， 710049，西安
  2.西北核技术研究院强脉冲辐射环境模拟与效应国家重点实验室， 710024，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202502013
  CLC： TL812
- Received：08 October 2024，
  
  Online First：31 October 2024，
  
  Published：10 February 2025
- 稿件说明：
移动端阅览
YAN Yihong, ZHANG Mei, SHENG Liang, et al. Optical Properties and Radiation Detection Properties of Silica Aerogel[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 127-133.
DOI：

YAN Yihong, ZHANG Mei, SHENG Liang, et al. Optical Properties and Radiation Detection Properties of Silica Aerogel[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 127-133. DOI： 10.7652/xjtuxb202502013.

摘要

针对惯性约束聚变中高能γ射线探测存在的X射线影响，以及气体切伦科夫辐射体调控阈值复杂或部分切伦科夫辐射体不可调控阈值的问题，提出了使用硅气凝胶作为切伦科夫辐射体对γ射线进行探测的方法。首先，搭建透过率测量平台，测量了厚度为1 cm的410 mg/cm

硅气凝胶在250~800 nm波长范围内的透过率，得到了硅气凝胶的吸收散射系数；然后，使用最小偏差角的方法对硅气

凝胶的折射率进行了测量，并对全波段折射率进行拟合；进而，将得到的吸收散射系数与折射率写入Geant4软件，在硅气凝胶探测系统中，对不同能量γ射线的能量响应进行了模拟计算；最后，在西北核技术研究院的

Co源上搭建系统，分别对硅气凝胶及石英玻璃的发光强度进行了测量。结果表明：硅气凝胶净信号达到了11.67 nA，不确定度为3.8%；石英玻璃的净信号达到了373.67 nA，不确定度为3.2%。研究结果证实了硅气凝胶切伦科夫探测系统对γ射线探测的可行性，说明了硅气凝胶可作为切伦科夫辐射体应用于惯性约束聚变中的高能γ射线诊断。

Abstract

To address the influence of X-ray on the detection of high-energy gamma rays in inertial confinement fusion and the challenges associated with the complex control thresholds of gas Cherenkov radiators and the fixed thresholds of some Cherenkov radiators

a novel approach was proposed in this paper to utilize silica aerogel as a Cherenkov radiator for gamma-ray detection. Firstly

a transmittance measurement platform was constructed

and the transmittance of a 1 cm thick silica aerogel with a density of 410 mg/cm

within the wavelength range of 250 nm to 800 nm was measured

along with its absorption and scattering coefficients. Subsequently

the refractive index of silica aerogel was determined using the minimum deviation angle method

followed by fitting across the wavelength range from 250 nm to 800 nm. These derived parameters absorption and scattering coefficients

as well as the refractive index were integrated into the Geant4 software. The Geant4 software was then used to simulate the different gamma energy responses of the silica aerogel detection system. Finally

the luminous intensity of both silica aerogel and quartz glass was measured respectively using a system based on a

Co source at the Northwest Institute of Nuclear Technology. The results show that the net signal for silica aerogel was 11.67 nA with a 3.8% uncertainty

while the net signal for quartz glass was 373.67 nA with a 3.2% uncertainty. This proved the feasibility of the silica aerogel Cherenkov detection system for gamma-ray detection. These results demonstrate the potential of silica aerogels as Cherenkov radiators for high-energy gamma-ray diagnostics in ICF experiments.

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references

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