太空环境下的宇宙射线辐射强度，超过地球上人体承受极限的十倍以上。
Background cosmic radiation levels in free space are ten times greater than the maximum acceptable levels for individuals who work in radiation environments on Earth.
采用场发射阴极的X射线光源具有体积小，辐射强度高，频率响应快，可以随时开启，无需预热的优点。
Using field emission cathode, X ray source can be made with several advantages: smaller volume and brighter, high frequency response, in-time turning on, etc.
通过反向应用射线踪迹法并与漫反射表面的有效辐射强度相结合来分析含漫射表面半透明体的表观光谱发射特性。
A ray split-off and tracing approach is presented to analyze the apparent spectral reflecting performance of a semitransparent fluid layer with undulant surface.
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