The fluence distribution must be known for absolute gamma ray measurements in spherical radiation fields.

注量率分布是球面源伽玛射线强度绝对测量的必需参数。

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In this paper, a hybrid method which combines the physical optics method with the rays theory is used for calculating the radiation fields of the reflector antenna.

本文论述了运用物理光学、射线理论混合分析反射面天线的过程，确定了混合方法在计算一般反射面天线时的分界区域。

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Objective To compare the acute radiation reactions and sequelae with different radiation fields and different modes of fractionated radiotherapy for nasopharyngeal carcinoma.

目的比较不同照射野或不同剂量分割放疗鼻咽癌的急性放射反应及后遗症。

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This theory was first aired a year ago following a small-scale study, and was ridiculed by the National Radiological Protection Board, the watchdog on health issues involving radiation and electromagnetic fields.

BBC: Battle lines drawn in pylon debate

Station managers would not wish to push it much higher because that would take it closer to known debris fields and more of the space radiation that can be harmful to the health of astronauts.

BBC: International Space Station in debris scare

The radiation belt, which contains "two concentric rings of charged particles trapped by Earth's magnetic fields" doesn't affect current astronauts going to and from space because they are moving too fast to be hit by the radiation.

ENGADGET: Space elevator ride may kill humans due to ionizing radiation