英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

mesothorium    
n. 新钍

新钍

Mesothorium \Mes`o*tho"ri*um\, n. [NL.; meso- thorium.]
(Chem.)
a radioactive isotope of radium (radium-228) with a half-life
of 5.8 years. Also called {mesothorium-1} or {mesothorium I}
to distinguish it from a subsequent decay product,
mesothorium II (actinium-228). It was discovered in 1907 by
Otto Hahn as a decay product of thorium (produced by decay of
thorium-232). Mesothorium-1 (radium-228) in turn produces
actinium-228 (mesothorium-2) as the first product of its
radioactive decay, and the actinium-228 in turn decays
quickly (half-life of 6 hours) to thorium-228 (which is also
called {radiothorium}; the thorium-228 has a half-life of
1.91 years, shorter than that of the radium-228). It was
discovered and named before full recognition of the nature of
isotopes of the elements, and was distinguished from other
variants of radium by its half-life and mode of production
and decay. It was also cheaper to prepare than other
short-lived radium isotopes, and was thus sold commercially,
for use, e.g. in making watch dials readable in the dark by
painting the hands and hour marks with a self-luminous paint
containing the radioactive substance; it is therefore often
referred to (e.g. in regulatory legislation) as though
distinct from radium. It was one of the isotopes believed
responsible for radiation-induced diseases observed in
industrial workers who painted radium on watch dials in the
late 1950's and early 1960's. The primary isotope of radium
(radium-226) has a half-life of 1620 years, and these
isotopes with shorter half-lives proved difficult to isolate
and study for the purpose of finding the cause of such
diseases.
[Webster 1913 Suppl. PJC]


请选择你想看的字典辞典:
单词字典翻译
mesothorium查看 mesothorium 在百度字典中的解释百度英翻中〔查看〕
mesothorium查看 mesothorium 在Google字典中的解释Google英翻中〔查看〕
mesothorium查看 mesothorium 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • The Bing Wallpaper for today is terrible AI Generate Art : r bing
    Microsoft Bing has hit a new low, I got the same thing this morning, it is supposed come from "Bing Photo of the Day", this is not a photo, it is an image, photo implies it was derived from light, which this clearly isn't AI images may have it's place in the world, but I don't want to be inundated with this crap
  • For those who had the 15-min search cooldown on points but dont anymore. . . . - Reddit
    And I do believe I have the cooldown on my bing app on my Xbox, so I’ll type on letter in, get the 5 points, then press the center button to get the side bar to pop up, I press start on bing and “close” it out and then reopen it again to type in a different letter for another 5 points, and so on and so forth for the 30 searches for the day
  • Why is Microsofts R D expenditure so high? What future-oriented technologies and products is it developing?-zhihu - 知乎
    How many investors have advised Microsoft to sell Xbox or Bing? Xbox has become one of the three major players in the gaming console market, with Kinect as its killer product As the core of the 'new Microsoft', how much can Xbox be sold for? What is the valuation of the investors who 'suggest selling Xbox', and give a quote first
  • Daily Check-In — Whats the most you got on Day 7? - Reddit
    When I open the Bing App (on Android - US) and go to the Rewards page, there's that Daily Check in section at the top I think it was 5pts the first two days, then 10pts the next two, then 20pts for days five and six, and finally the big seventh day which has been 50pts and 60pts for me so far
  • Search Box no longer displaying a daily image : r WindowsHelp
    true I like Windows 11's Search Box and its image on the right side, but since I ran PC Manager, this little feature seems to be broken and now only a Bing's "B" is displayed It has been like this for 2 days I attempted only restarting Windows Explorer process, but it didn't bring the daily image back
  • Quote of the day? : r MicrosoftRewards - Reddit
    This is Bing's Quote of the Day on Feb 15: A house divided against itself cannot stand Abraham Lincoln 16th president of the United States Pretty sure someone else said it first, Bing
  • I’ve been collecting the Bing Word of the Day for an entire year now! : r bing - Reddit
    On the day that I posted this, 5-28-2023, it would have been an entire year since I started collecting the daily word that Bing offers every day For those of you don’t know, if you search for “Word of the day” on Bing, you will find a unique vocabulary word that is specific to each day That’s what I’ve been documenting for the past
  • 10 11 23 : r BingQuoteOfTheDay - Reddit
    The Real Housewives of AtlantaThe BachelorSister Wives90 Day FianceWife SwapThe Amazing Race AustraliaMarried at First SightThe Real Housewives of DallasMy 600-lb LifeLast Week Tonight with John Oliver Celebrity Kim KardashianDoja CatIggy AzaleaAnya Taylor-JoyJamie Lee CurtisNatalie PortmanHenry CavillMillie Bobby BrownTom HiddlestonKeanu Reeves
  • Todays Bing Quote of The Day : r scienceisdope - Reddit
    Today's Bing Quote of The Day : r scienceisdope r scienceisdope Current search is within r scienceisdope Remove r scienceisdope filter and expand search to all of Reddit r scienceisdope





中文字典-英文字典  2005-2009