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:


  • Credit Card, Mortgage, Banking, Auto | Chase Online | Chase. com
    Chase online lets you manage your Chase accounts, view statements, monitor activity, pay bills or transfer funds securely from one central place To learn more, visit the Banking Education Center
  • secure. chase. com
    We would like to show you a description here but the site won’t allow us
  • Chase
    We would like to show you a description here but the site won’t allow us
  • Chase Secure Banking | Checking Account With No Overdraft Fees | Chase. com
    Chase Secure Banking is a simple, convenient checking account with no overdraft fees and requires no minimum deposit to get started Moreover, there are no fees on most everyday transactions like money orders, cashier’s checks, when you cash checks, send money using Zelle ® or use a Chase ATM
  • Sign In - Chase
    JPMorgan Chase Co Authentication is required Please login with your desktop password to continue Sign in
  • Chase Online | Chase for Business
    However, you can enroll in Chase Online through chase com or the Chase Mobile ® app You can use the ATM branch locator, as well as access Chase contact information, without being enrolled in Chase Online
  • Chase Mobile®: Bank Invest - App Store
    Bank securely with the Chase Mobile® app: send and receive money with Zelle®, deposit checks, monitor credit score, budget and track income spend Use J P Morgan Wealth Management to plan, invest, set and track long-terms goals with Wealth Plan
  • JP Morgan SingleSignon - Chase
    UNAUTHORIZED USE OF J P MORGAN'S WEBSITES AND SYSTEMS INCLUDING BUT NOT LIMITED TO UNAUTHORIZED ENTRY INTO J P MORGAN'S SYSTEMS, MISUSE OF PASSWORDS, OR MISUSE OF ANY INFORMATION POSTED TO A SITE, IS STRICTLY PROHIBITED
  • Login | J. P. Morgan Private Bank U. S.
    Bank deposit products, such as checking, savings and bank lending and related services are offered by JPMorgan Chase Bank, N A Member FDIC Not a commitment to lend
  • Home | JPMorganChase
    © 2026 JPMorgan Chase Co All rights reserved JPMorgan Chase Co is an Equal Opportunity Employer, including Disability Veterans





中文字典-英文字典  2005-2009