A device for converting heterogeneous beam of radiation to homogeneous beam by absorption or refraction of unwanted components.

利用吸收或折射掉不需要的成分，把非单色光束变成单色光束的装置。

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Placement of gold fiducials is required for real-time tracking and delivery of a high-dose therapeutic beam of radiation to the tumor.

放置金基准点可以实时追踪和发放及剂量的治疗性射线用于肿瘤治疗。

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Pulsars are tiny, dead neutron stars that are only around 20 kilometers (12.4 miles) in diameter and spin hundreds of times a second, emitting beam of radiation.

脉冲星是已经死亡的小型中子星，直径只有20公里(12.4英里)左右，每秒旋转数百次，同时还会向外发出无线电光束。

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Given the risks of aiming such a powerful beam of high-intensity radiation at an Earth ground station, as well as the cost of building billions of dollars in infrastructure to collect the energy in space, the efficiencies you can get from terrestrial solar power seem a safer bet--at least for now.

FORBES: Galactic Gold Mine?

It improved upon older radiation technology with a combination of new software and hardware that could mold a radiation beam to match the shape of a tumor.

WSJ: Medicare Investigation Reveals a Sharp Rise in Controversial and Expensive Prostate Cancer Treatment

Or you can pick your poison, choosing between surgery to remove the prostate and one of two forms of radiation, external beam radiation and radioactive "seeds" implanted in the gland itself.

FORBES: Men, Cancer, & Hope