There is no such thing as a radiation cloud. There can be however radioactive material. Radiation itself expands in all directions just as white light does.

根本就没有辐射云这一说。到处都可能有核物质。辐射就像光线一样四处分散。

youdao

Such as blackbody radiation and photoelectric effect of light also has revealed the phenomenon of particle, ie, with wave-particle duality of light.

黑体辐射和光电效应等现象揭示了光还具有微粒性，即光具有波粒二象性。

youdao

The light is thermal radiation source, mainly used for heating and drying, the specific, such as glass, metal, circuit board sealing, film and printing products for curing.

该灯属于热辐射光源，主要用于加热和烘干，具体如玻璃制品、金属、电路板的封接、胶片及印刷制品的固化。以及其它产品表面烘干、干燥、加热。

youdao

Perhaps its greatest moment came in 1979 when it was the first telescope to observe a gravitational lens, an effect where a "massive" object bends electromagnetic radiation such as light around it.

BBC: Aye to the telescope