镤的同位素 Isotopes of protactinium
镤的同位素均具有放射性,其中最稳定的为Pa,质量数在231以下的同位素主要发生α衰变生成锕,而质量数超过231的主要发生β衰变生成铀。
单词 | brevium |
释义 |
brevium
英汉-汉英词典
n. [核能]铀X3
词组 | 习惯用语
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brevium n. 铀X3 网络短语:registrum brevium 法院令状登记册 burnt chrome-magnesite brevium 烧结铬镁砖
中文百科
镤的同位素 Isotopes of protactinium(重定向自Brevium)
镤的同位素均具有放射性,其中最稳定的为Pa,质量数在231以下的同位素主要发生α衰变生成锕,而质量数超过231的主要发生β衰变生成铀。
英语百科
Isotopes of protactinium 镤的同位素(重定向自Brevium)
Protactinium (Pa) has no stable isotopes. There are three naturally occurring isotopes, allowing a standard mass to be given. Relative atomic mass: 231.03588(2). Twenty-nine radioisotopes of protactinium have been characterized, with the most stable being Pa with a half-life of 32,760 years, Pa with a half-life of 26.967 days, and Pa with a half-life of 17.4 days. All of the remaining radioactive isotopes have half-lives that are less than 1.6 days, and the majority of these have half-lives that are less than 1.8 seconds. This element also has 3 meta states, Pa (t1/2 1.15 milliseconds), Pa (t1/2 420 nanoseconds), and Pa (t1/2 1.17 minutes). |
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