Reportedly, levels of radiation have temporarily exceeded 1,000 micro sievert, which is twice the legal upper limit; but in many cases they have been little worse than an X-ray.
Most propagation models , which can be adapted micro cellcluar are theory method based on ray tracing method.
微区电波传播特性分析模型多是理论模型，采用射线追踪法，对源辐射情况进行模拟。
3
The surface layers are characterized by means of the optical microscope, X ray diffraction, transmission electronic microscope, and micro hardness testing machine.