粒子

The isotope 232Th has a half-life of 14 billion years and decays to 228Ra by emitting an alpha particle, which is called the alpha decay (the blue arrows show the "direction" of decay).

同位素中232Th的半衰期为14亿年和衰变40.2，82.7，32.4，28.9，94.2，69.3，57.1，71.6，64.0，71.4，692发光的一个粒子，即所谓的衰变(蓝色箭头显示的"方向"的衰变)。

Alpha decay commonly occurs in elements with atomic numbers greater than 83, but can occur in some rare-earth elements in the atomic-number range of 60 to 71.

发射α粒子的主要是重于铋(lutetium，原子序数83)和从钕(neodymium，原子序数60)到镏(Iutetium，原子序数71)的稀土元素，α衰变的半衰期，从1微秒(10-6秒)到约1017秒。

A multi-functional spectrometer-identificator is developed to measure fluxes and spectra of protons, alpha particles, oxygen and iron ions in space.

这套空间带电粒子谱探测系统主要有金硅面垒探测器、CsI闪烁体和改进的快响应电子学系统构成，包括ΔE-E望远镜系统和数据的获取及处理系统。

The detectors were irradiated with a mono-energetic beam of charged particles, which are protons, alpha particles, oxygen and iron ions.

粒子的能量刻度采用的是1／3档，在ΔE〓探测器中每道能量H〓=0.107MeV／道，在ΔE〓探测器中每道能量H〓=0.123MeV／道。

Suddenly there's an alpha particle coming out of it, except the alpha particle is another universe.

突然有一个阿尔法粒子从原子核里出来，而从中间的多元宇宙里出来的是具有时间之箭的小宇宙。

The hot alpha particle power absorption is important only when the damping is weak.

计算还得到，只有在弱阻尼的情况下，α粒子吸收的功率才是重要的。

Thus the alpha particle is an exceptionally stable nuclear structure.

由此可见，α粒子是一种特别稳定的核结构。

The SucceSs of Rutherford's theory of alpha particle scattering giveshim the distinction of having discovered the atomic nucleus.

由于卢瑟福成功地提出了Ot粒子散射理论，人们将发现原子核的荣誉归功于他。

The alpha particle radiation emitted by DU travels less than an inch and can be stopped by cloth or even tissue paper.

阿尔法粒子辐射所发出的旅行杜少於一英寸，可也阻挡不住的布，甚至卫生纸。

Its isotopes, all radioactive, are highly toxic radiological poisons because they give off alpha particle s and are specifically absorbed by bone marrow.

它的所有同位素都是放射性的，因其放出的α粒子易于被骨髓吸收而具有高度的放射性毒性。尽管具有潜在的致命性，它的毒性通常是被夸大了的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。