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汉语拼音：gā mǎ shè xiàn

放射性元素的原子放出的射线，是波长极短的电磁波，穿透力比爱克斯射线更强。工业上用来探伤，医学上用来消毒、治疗肿瘤等。通常写作γ射线。[伽马，希腊字母γ的音译]

1. 亦称丙种射线。镭和其它一些放射性元素的原子所放出的射线。通常写作γ射线。伽马，希腊字母第三个字母γ的译音。

• Gamma-ray bursts cannot be seen by the human eye, but if they could the sky would light up like a camera flash each time they occurred.

  伽马射线暴不能被人眼，但如果他们能够将天空照亮了像照相机闪光灯每次发生。

• They come in two types, long and short, with the former the most common and thought to be caused by the core-collapse of a supernova.

  伽马射线爆有长时间的和短时间的两种，其中据信由超新星核的坍塌引起的长时间伽马射线爆是最常见的。

• The probability of a specific interaction occurring depends on the atomic number of the material and the energy of the gamma ray.

  发生特殊相互作用的可能性和物质的原子量以及伽马射线的能量有关。

• These observations revealed a burst of radio light that coincided with the gamma-ray flares, which usually lasted a few days.

  这些观测显示，射电光的爆发跟伽马射线的闪光是同步的，通常会持续几天。

• Last month, we discovered a bright gamma-ray flare from the direction of this star while it was undergoing a huge optical outburst.

  在上个月这颗亮星经历一次大规模光学爆发的时候，我们在它所在的方向上发现了一次伽马射线爆发。

• Every week, astronomers sight two or three gamma ray bursts (GRBs), short flashes of high-energy radiation from collapsing stars.

  天文学家们每周都能看到两三次伽马射线爆发（GRBs）现象，这种现象是恒星塌缩时产生的高能辐射所造成的短暂闪光。

• The bubbles display a spectrum with higher peak energies than that of the diffuse gamma-ray glow seen throughout the sky.

  气泡结构的光谱呈现出峰值能量高于全天区弥散伽马射线的状态。

• NASA's Fermi spacecraft has discovered a pair of enormous gamma-ray-emitting bubbles extending from the Milky Way's center.

  美国航空航天局费米太空望远镜发现了源自银河系中心的一对巨大的气泡状伽马射线喷发结构。

• He believes that this process supplies the gamma-rays observed by Fermi.

  他相信这个过程产生出了费米镜观测到的伽马射线流。