Tiny 'nuclear batteries' unveiled 微小“核能电池”问世
文章来源:未知 文章作者:meng 发布时间:2009-10-09 03:00 字体: [ ]  进入论坛

Researchers have demonstrated a penny-sized "nuclear battery" that produces energy from the decay of radioisotopes.


The team hopes to make nuclear batteries much smaller still
The team hopes to make nuclear batteries much smaller still

As radioactive substances decay(衰退,腐败), they release charged particles that when properly harvested can create an electrical current.

Nuclear batteries have been in use for military and aerospace3 applications, but are typically far larger.

The University of Missouri team says that the batteries hold a million times as much charge as standard batteries.

They have developed it in an attempt to scale down power sources for the tiny devices that fall under the category of micro- and nano-electromechanical systems (Mems and Nems).

The means to power such devices has been a subject of study as vigorous(精力充沛的,有力的) as the development of the devices themselves.

Liquid solution

Nuclear batteries are an attractive proposition for many applications because the isotopes2(同位素) that power them can provide a useful amount of current for phenomenally long times - up to hundreds of years or more.

As a result, they have seen use in spacecraft that are fired far off into the cosmos4(宇宙). But for applications here on Earth, their size has limited their use.

The Missouri team, led by Jae Wan5 Kwon, employed a liquid semiconductor6 to capture and utilise(利用,使用) the decay particles.

Most nuclear batteries use a solid semiconductor to harvest the particles, but the particles' extremely high energies means that the semiconductors7 suffer damage over time.

This means that to build a battery that can last as long as the isotope1 inside, they must be built larger.

The team's solution incorporates a liquid semiconductor, in which the particles can pass without causing damage. They are now working to further miniaturise the batteries.

And although the whole idea hinges on(依……而定) the use of radioactive materials, the devices are safe under normal operating conditions.

"People hear the word 'nuclear' and think of something very dangerous," Dr Jae said.

"However, nuclear power sources have already been safely powering a variety of devices, such as pacemakers, space satellites and underwater systems."


1 isotope isotope     
  • The isotope ratio is directly used for comparing oils or gases.同位素比率直接用于比较各种石油或天然气。
  • How to apply a radio isotope?如何运用放射性同位素?
2 isotopes 92848c3160703e48dc3b552ac6f54115     
n.同位素;同位素( isotope的名词复数 )
  • the many isotopes of carbon 碳的诸多同位素
  • Tritium is one of the mildest radioactive isotopes. 氚是最和缓的放射性同位素之一。 来自《简明英汉词典》
3 aerospace CK2yf     
  • The world's entire aerospace industry is feeling the chill winds of recession.全世界的航空航天工业都感受到了经济衰退的寒意。
  • Edward Murphy was an aerospace engineer for the US Army.爱德华·墨菲是一名美军的航宇工程师。
4 cosmos pn2yT     
  • Our world is but a small part of the cosmos.我们的世界仅仅是宇宙的一小部分而已。
  • Is there any other intelligent life elsewhere in the cosmos?在宇宙的其他星球上还存在别的有智慧的生物吗?
5 wan np5yT     
(wide area network)广域网
  • The shared connection can be an Ethernet,wireless LAN,or wireless WAN connection.提供共享的网络连接可以是以太网、无线局域网或无线广域网。
6 semiconductor Uzuwq     
  • In the beginning,engineers hoped to use semiconductor lasers.在开始时,工程师们希望能够利用半导体激光器。
  • The main agent of the company brand semiconductor sales.本公司主要代理各品牌半导体销售。
7 semiconductors 0e1983fea761e849266037e7a40cb125     
n.半导体( semiconductor的名词复数 )
  • Crystals may be insulators, semiconductors, or conductors. 晶体可以是绝缘体,半导体,或导体。 来自辞典例句
  • Semiconductors containing such impurities are called p-type semiconductors. 含有这类杂质的半导体叫做P型半导体。 来自辞典例句
TAG标签: energy battery nuclear decay