铋-209209Bi)是同位素之一,具有极微弱的放射性半衰期长达1.9×1019年。是铋最稳定的同位素,也是所有发生α衰变放射性同位素中已知半衰期最长的。它有83个质子和126个中子,原子质量为208.9803987原子质量单位。其中子数126为幻数,因此具有特别的稳定性。铋-209是铋最普遍的同位素,几乎占天然铋的100%。

铋-209,209Bi
基本
符号209Bi
名称铋-209、Bi-209
原子序83
中子数126
核素数据
丰度100%
半衰期2.01×1019[1]
母同位素209Pb (β)
209Po (β+)
213At (α)
衰变产物205Tl
原子量208.9803987 u
自旋9/2−
过剩能量−18 258.461± 2.4 keV
结合能7847.987± 1.7 keV
衰变模式
衰变类型衰变能量MeV
α衰变3.1373
铋的同位素
完整核素表

衰变特性 编辑

长期以来,人们认为铋-209是所有元素中最重的稳定同位素,但2003年,法国奥赛天体物理和空间研究所的一个研究小组发现209Bi具有放射性,其发生α衰变半衰期约为1.9×1019[2][3],超过宇宙年龄的十亿倍。[4]现在公认最稳定的最大质量数核素铅-208

在不受外界影响的情况下,铋-209衰变产生3.14兆电子伏的α粒子,并嬗变铊-205[5]

 

在人工干预下(比如在反应堆中或使用加速器),铋-209可以参加铅-铋中子俘获循环。铅-206/207/208直到铋-209都可以参加这一循环,但是俘获截面都相当低。[6][7]

由于铋-209超长的半衰期,对于其应用来说,209Bi仍然可以被当作非放射性物质处理。它的放射性比人体的放射性低得多,因此不会造成任何意义上的辐射伤害。虽然209Bi创造了α衰变的半衰期记录,但其半衰期并不是实验上确认的放射性核素中最长的;这一殊荣属于-128(128Te),其双β衰变的半衰期估计为7.7×1024年。[8]而当今宇宙年龄不过为(1.3799±0.021)×1010年。[9][10]

2012年,意大利大萨索国家实验室(Laboratori Nazionali del Gran Sasso)团队验证了铋-209α衰变的半衰期值,他们报告的数据是(2.01±0.08)×1019年。他们还发现了铋-209经α衰变到铊-205的第二种路径,即从铋-209衰变为铊-205第一激发态。这个反应的半衰期更长,估计为1.66×1021年。[11]尽管这两个半衰期都比碲-128的半衰期短,但其α粒子能谱的半峰宽是目前观测到最小的,根据海森堡测不准原理估计分别为ΔΕ~5.5×10-43eV和ΔΕ~1.3×10-44eV。[12]

用途 编辑

因为天然铋完全由铋-209组成,所以所有铋的用途都可看作是铋-209的用途,如的替代品、[13][14]化妆品、[15][16]油漆[17]和像是次水杨酸铋的药物。[4][18][19]

合成其它元素 编辑

210Po可通过在核反应堆中用中子轰击209Bi来制造[20],全世界每年210Po的产量约为100克左右。[21][20]209Po和208Po则可由质子轰击209Bi而成。[22]用α粒子轰击209Bi则能得到[23][24][25]

209Bi也可用于合成如𬭊[26][27][28][29]𬭛[26][30][31][32][33]𬬭[34][35][36][37][38][39]超重元素

核合成 编辑

渐近巨星支红巨星中,铋-209和钋-210经由S-过程(慢速过程)通过中子俘获而形成。此二核素是S-过程产生的最重元素。所有比它们更重的元素都是在R-过程(快速过程)中形成的,该过程发生在超新星爆发前十五分钟。[40]

参见 编辑

脚注 编辑

相邻较轻同位素:
铋-208
铋-209是
同位素
相邻较重同位素:
铋-210
母同位素
砹-213 (α)
钋-209 (β+)
铅-209 (β)
铋-209的
衰变链
衰变产物
铊-205 (α)

参考文献 编辑

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