这个世界，放射性物质无所不在。我们是成功生活在其中的一个物种，我们已经进化出对抗自然放射影响的保护机制。
We are a successful species inhabiting a radioactive world and must have evolved protective mechanisms to deal with the effects of natural radiation.
平均每个美国人每年接收360毫雷姆的射线，其中300毫雷姆来自自然放射源，60毫雷姆来自人类活动(雷姆是射线强度单位)。
The average American receives 360millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
当氦衰变成为氦-3相对于我们在太阳里看到的那它就可用了，因为地球上多数的氦-4是通过元素铀和钍自然放射性衰变而造成的。
What helium is available is depleted in helium-3 relative to what we see in the sun, because most of Earth's helium-4 is freshly made via natural radioactive decay of the elements uranium and thorium.
自然伽马测井是套管井测井中一种最基本的方法。它以地层自然放射性为基础，测井时用伽马射线探测器沿井眼进行测量。地层中的自然伽马放射性不是一成不变的。
Natural gamma logging is a kind of most basic methods of well logging in cased Wells which measure with gamma ray detector along well during logging.
对人类的放射剂量如果与自然环境辐射水平相比属低水平。
Radiation doses to humans may be characterized as low-level if they are comparable to natural background levels.
直到现在，上周在发表在《自然地球科学》的一篇论文报告了最近使用中微子探测器量化放射产生热量的工作结果。
Until now. A paper published last week in Nature Geoscience reports the results of recent work using neutrino detectors to quantify the radiogenic production of heat.
他告诉《自然》，“只有一小部分放射性物质被释放，所以我并不关心吸入所造成的伤害”。
"Only a small amount of radiation gets re-suspended, so I'm not concerned about damage from inhalation," he told.
尽管如此，霍普金斯大学放射学教授WilliamEdelstein在2010自然杂志的头条登了自己对超光速旅行辐射危险的看法。
Still, John Hopkins University radiology professor William Edelstein made science headlines in 2010 with his concerns about the radiation risks of faster-than-light travel.
氮的这种放射性形式在自然界中不会产生。
对大多数人来说，他们自然环境辐射剂量的一半以上来自氡—一种可聚集在家庭、学校和工作场所的放射性气体。
For most people more than half of their natural background radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces.
氡是一种放射性的自然气体，从地下散发到空气中。
Radon is a natural radioactive gas that emanates from the ground into the air.
食品中的放射性碘直接引起人们的关注，但是它的半衰期相对较短并将在短时间内自然衰变。
Radioactive iodine in food is of immediate concern, but it has a relatively short half-life and will naturally decay over a short time frame.
氡是一种自然产生的放射性惰性气体，它无色、无味、无臭。
Radon is a chemically inert, naturally occurring radioactive gas without odour, colour or taste.
这些剂量可用以比较20年中人们通常接受的自然环境放射的平均剂量。
These can be compared with the average doses people normally receive from natural background over 20 years.
放射性元素在自然衰败过程中所产生的热量能使星球上的水维持液态形式。
Heat from the decay of naturally occurring radioactive elements could keep a planet warm enough for water.
放射性碘的半衰期为八天，几周内自然衰变。
Radioactive iodine has a half-life of eight days and decays naturally within weeks.
氡，放射性气体，由泥土中自然出现的铀衰变中释放。EPA已经注意到它是肺癌的主要环境原因。
Radon, the radioactive gas given off from the decay of naturally occurring uranium in soil, has been noted by the EPA to be a major environmental cause of lung cancer.[5]The
它是氢气的一种形态，它自然发生放射，有时被人们称为重氢。
It is a naturally occurring radioactive form of hydrogen, sometimes known as heavy hydrogen.
令人信服的是，考虑到自然本底值，这样小的放射水平对人体健康是无关紧要的。
It is believed that such a level is of no significance to human health having regard to natural background levels.
自然历史博物馆能放射异彩主要得力于她。
The natural history museum flourished largely because of her energies.
臭氧一种气态氧气的同素异形体，O3在紫外线辐射下通过电子放射或暴晒从双原子氧气自然形成。
A blue gaseous allotrope of oxygen, O3, formed naturally from diatomic oxygen by electric discharge or exposure to ultraviolet radiation.
着重探讨了放射性测井曲线中自然伽马测井曲线、补偿中子测井曲线和补偿密度测井曲线的高分辨率处理方法及其应用效果。
This article mainly deals with the resolution enhancement technique and its application in radioactive logs, such as natural gamma log, compensated neutron log and compensated density log.
自然伽马测井测量的是地层总的自然伽马放射性，是套管井测井的一种最基本的方法。
What natural gamma well logging measured is total natural gamma radioactivity in layer, and it is a kind of most basic method in casing pipe well logging.
通过16口浅层自然伽马能谱测井资料分析黄河三角洲浅层放射性的区域变化状况。
The radioactivity variation of the shallow part of Yellow River delta with the natural gamma ray spectrum logging from 16 Wells is studied.
浊积岩储层中受放射性矿物和地层水矿化度的影响，使得自然伽马曲线和自然电位曲线不能真实地反映储层泥质含量情况。
Resistivity curve is mainly used in the calculation of formation shale content in the logging interpretation for conglomerate reservoir at present.
最近，通过对荧光灯中的磷改良，使得荧光灯提高了红色光的放射量，使得发出的光线更接近自然光。
Recent developments in fluorescent phosphors have yielded spectra more like natural sunlight by boosting the red end of their light output.
1898年居里夫人和她的丈夫宣称他们相信在自然界中存在着放射性物质。
In 1898 Madane Curie and her husband declared that they believe there was something in mature which gave out radio-activity.
1898年居里夫人和她的丈夫宣称他们相信在自然界中存在着放射性物质。
In 1898 Madane Curie and her husband declared that they believe there was something in mature which gave out radio-activity.
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