Before the laser, scientists developed a similar device: a maser which stands for Microwave Amplification by Stimulated Emission of Radiation.

VOA: special.2010.09.01

Second, even if it didn't collapse, they said you've got a radiation problem.

第二点，即使不坍塌，他们说会存在辐射问题。

麻省理工公开课 - 固态化学导论课程节选

And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。

麻省理工公开课 - 固态化学导论课程节选

So for the ten patients in the study, doctors used a low amount of radiation to destroy only some of their marrow.

VOA: special.2009.12.16

For example, if we talk about photons, of course, we also just mean light, sometimes we refer to this as electromagnetic radiation, and there's several ways that you might be asked this in a problem or that you might be asked to answer.

举例来说，如果我们讨论光子，当然我们也叫做光，有时候我们看作是电磁辐射，而且这里有几种方式,你可能会在题目中被问到,或者被提问回答。

麻省理工公开课 - 化学原理课程节选

They found that in many cases, the risk of developing cancer from the radiation outweighed the risk of a serious brain injury.

VOA: special.2009.10.28

He used various forms of high-energy radiation in order to make the droplets bear a charge.

他使用很多形式的高能辐射,为了就是使这些液滴带电。

麻省理工公开课 - 固态化学导论课程节选

Another was a set of special instruments that helped measure the effects of the sun's radiation on the outside of the aircraft.

VOA: special.2010.07.07

So what we'll do is this problem here, which is let's calculate out what the wavelength of radiation n would be emitted from a hydrogen atom if we start at the n equals 3 level and we go down to the n equals 2 level.

我们来做这个问题,让我们来计算一下,从n等于3到,等于2能级氢原子辐射的波长是多少。

麻省理工公开课 - 化学原理课程节选

But a recent study warned that more children than necessary are being exposed to radiation this way.

VOA: special.2009.10.28

People can get cancer from low doses of ionizing radiation, the kind released in a nuclear accident.

VOA: special.2011.03.16

The patient does not get much radiation from the process, which lasts only a few minutes.

VOA: special.2010.08.31

The most important was the discovery of a belt of radiation around the Earth.

VOA: special.2009.06.10

Microwaves are a form of electromagnetic radiation similar to, but shorter than,radio waves.

VOA: special.2010.09.01

every year, the government is under pressure to make an official recommendation on how much radiation is safe during a CT scan.

VOA: standard.2010.04.07

In a real nuclear attack, hundreds of thousands of people would have to be decontaminated from radiation.

VOA: standard.2010.07.21

In two other cities, Los Angeles,California and Huntsville,Alabama, a study also showed significant differences in radiation.

VOA: standard.2010.01.30

But some doctors say the CT scan exposes patients unnecessarily to harmful radiation, as much radiation as a patient might receive from 400 chest x-rays.

VOA: standard.2010.04.07

Journal editor Catherine DeAngelis says another article describes the high success rate of tumor control for a new form of radiation for inoperable lung cancer.

VOA: standard.2010.03.25

It exposes a patient to much larger doses of radiation than the usual x-ray.

VOA: standard.2010.01.30

Experts say terrorist groups are seeking materials for a crude nuclear device - a so-called "dirty bomb" - that would have limited blast potential but could spread radiation in a major urban area.

VOA: standard.2010.04.11

The United Nations Environment Program said many inhabitants of towns in northeast Somalia suffered from diseases consistent with radiation sickness following a Tsunami in 2004, that may have stirred up tons of nuclear and toxic waste.

VOA: standard.2009.10.30

In mid-April,Kenya signed a deal, which will allow the United States to install radiation sensors and other equipment at its busy Mombasa seaport to detect any nuclear or radiological materials that could be smuggled in to be used in a weapon.

VOA: standard.2009.05.01