基于 Cerenkov 效应水下放射源搜寻技术的可行性分析研究

摘要

In this paper ,Geant4 was used to simulate the process of underwater radioac‐tive source generating Cerenkov light and transportation of Cerenkov light in water ,and the intensity of Cerenkov light and distribution of photon number in the horizontal plane were obtained .The theoretical verification and the feasibility analysis of this technical means were performed .Calculation results show that when the energy of emitted parti‐cle is greater than the threshold energy of Cerenkov light generating ,the Cerenkov light spot as well as the distribution of Cerenkov photon number on the surface of water is regular ,and then the location and depth of radioactive source can be deduced .Thereby , this work contributes a theoretical basis for the development of using Cerenkov light to search underw ater radioactive source .%本文采用Geant4对水下放射源致Cerenkov光及Cerenkov光在水中的输运过程进行计算研究，获得Cerenkov光强及光子数在水平面上的分布规律，进而对该技术手段进行了理论验证和可行性分析。研究结果表明：当放射源出射粒子能量满足产生Cerenkov光的条件时，其在水面形成的Cerenkov光斑及Cerenkov光子数在水面的分布具有规律性，可以此来确定放射源的位置和深度。本工作为基于Cerenkov效应水下放射源搜寻技术的发展提供了理论依据和科学基础。