Radiation doses to humans may be characterized as low-level if they are comparable to natural background levels.
对人类的放射剂量如果与自然环境辐射水平相比属低水平。
Thermoluminescence studies of meteorites suggest that the level of natural TL in meteorites is determined by competition between build up, due to exposure to cosmic radiation, and thermal decay.
陨石热释光研究揭示了陨石中自然TL值取决于陨石暴露在宇宙空间时的宇宙射线辐照和自身热衰变之间的平衡。
This software can be used for package -, board - or system-level CFD simulation, including natural and forced convection and radiation heat transfer.
该软件可用于封装，电路板及系统级CFD模拟，包括自然对流、强制对流和辐射传热。
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