www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Innovation

China produces its first neutron beams

By ZHANG ZHIHAO | China Daily | Updated: 2017-09-02 06:46

China has become the latest country to create neutron beams-which can examine subatomic materials without damaging their structure-an advance expected to lead to new discoveries in material science, clean energy and medicine.

The beams were first produced on Aug 28 at the China Spallation Neutron Source in Dongguan, Guangdong province, making China the fourth country in the world, after the United States, United Kingdom and Japan, to have a neutron beam source.

"This is a major milestone for Chinese scientists. The lab will help us solve some of the nation's most difficult scientific issues," said Chen Hesheng, an academician of the Chinese Academy of Sciences and the manager of the project.

"It will also help the Guangdong-Hong Kong-Macao Greater Bay Area to upgrade its industries and support their high-end scientific research and development," Chen said.

The China Spallation Neutron Source cost 1.87 billion yuan ($280 million) and took around six and a half years to build. It will be fully operational next year and Chinese scientists from more than 70 projects and 22 universities have applied to use it. The facility would also be open to foreign researchers, he said.

Neutrons and protons are found at the nucleus, or the core of an atom-the basic building block of materials. While protons have a positive charge, neutrons have no electric charge, and have strong penetrative capability.

As a result, unlike X-rays, whose ionized radiation can rip through the atomic structures of biomaterials like proteins, neutron rays can just pass through the material without damaging the structures, Chen said.

However, some neutrons will hit the atomic nucleus in the material and "bounce" harmlessly away at an angle in a phenomenon called neutron scattering, hence creating the "spallation". Using detectors, scientists can count these scattered neutrons, measure their energies and the angles at which they scatter, and map their final positions.

This way, scientists can glean details about the nature of the examined materials-from its atomic arrangement to movements.

"This will help scientists discover new chemical mechanisms for producing clean energy, new material for more powerful electronics, or create stronger and more durable material for engines," Chen said.

Another promising application is creating new therapies to treat tumors that are difficult to operate on by hand, such as brain tumors, said Fu Shinian, a researcher at the academy's Institute of High Energy Physics.

The Boron Neutron Capture Therapy takes advantage of boron's properties to accurately latch onto cancer cells. Then doctors can shine neutron beams at the tumor, triggering the boron to kill the cancer cells while leaving surrounding cells intact, Fu said.

Despite these promising applications, creating neutron beams is no easy task. In China's neutron source, scientists have to accelerate a group of protons close to the speed of light, use them to smash into a target tungsten block, and knock the neutrons out of the target's atomic nucleus.

Then these neutrons are "sucked" into various branches and channeled into different lab equipment for research, said Chen. All of the equipment used to generate the neutron beams is more than a dozen meters underground, trapping the tiny amount of harmful radiation created in the process.

China's neutron source will be free to the public, only collecting a small fee from companies with special needs.

Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 久久综合色播 | 先锋影音xfyy5566男人资源 | 免费黄色毛片视频 | 91亚洲国产成人久久精品网址 | 色网站在线观看 | 欧美视频精品在线 | 最新国产精品好看的国产精品 | 九九视频在线观看视频23 | 久久成人在线 | 国产特一级毛片 | 国内精品伊人久久久久妇 | 亚洲精品国产福利一区二区三区 | 性久久久久久 | 国产一级免费视频 | 动漫一级毛片 | 免费观看成年人网站 | 妖精www成人动漫在线观看 | 成年男女免费视频 | 91精品91 | 久免费视频 | 国产精品_国产精品_国产精品 | 欧美极品第1页专区 | 亚洲品质自拍视频网站 | 久久久久99精品成人片三人毛片 | 成人做爰全过程免费看网站 | 女人野外小树林一级毛片 | 国产午夜伦伦伦午夜伦 | 成年人午夜免费视频 | 日本一区二区三区高清在线观看 | 久久久精品久久久久三级 | 爱啪网亚洲第一福利网站 | 国产成人综合一区精品 | 无限观看社区在线视频 | 成人亚洲精品 | 日本加勒比在线观看 | 九九免费精品视频 | 国产手机精品a | 亚洲一区二区三区高清视频 | 欧美男人天堂 | 国产1级片| 最新欧美精品一区二区三区不卡 |