宇宙成因氚$^3$ H（CRAC：3 H）在大气中产生的一个新的全三维模型
A New Full 3-D Model of Cosmogenic Tritium $^3$H Production in the Atmosphere (CRAC:3H)
摘要：
本文提出了一个宇宙成因氚（$^3$ H）在大气中产生的新模型。该模型属于CRAC（Cosmic-Ray Atmospheric Cascade）族，命名为CRAC：3 H。它是基于一个完整的蒙特卡罗模拟的宇宙射线诱导的大气级联使用的Geant 4工具包。CRAC：3 H模型首次能够计算任何位置和时间的氚产生，对于任何给定的初级入射宇宙射线粒子的能谱，也是第一次明确处理比质子重的粒子。该模式为利用$^3$ H作为大气和水文循环的示踪剂提供了一个有用的工具。一个实际使用的模型的数值配方被追加。
英文摘要：
A new model of cosmogenic tritium ($^3$H) production in the atmosphere is presented. The model belongs to the CRAC (Cosmic-Ray Atmospheric Cascade) family and is named as CRAC:3H. It is based on a full Monte-Carlo simulation of the cosmic-ray induced atmospheric cascade using the Geant4 toolkit. The CRAC:3H model is able, for the first time, to compute tritium production at any location and time, for any given energy spectrum of the primary incident cosmic ray particles, explicitly treating, also for the first time, particles heavier than protons. This model provides a useful tool for the use of $^3$H as a tracer of atmospheric and hydrological circulation. A numerical recipe for practical use of the model is appended.
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