フランシウム(Fr)は、安定同位体を持たないため標準原子量は定められない。
フランシウムの同位体のうち、アクチニウム系列に属する同位体は以下の別名でも知られている：
- アクチニウムK (actinium K) : 223Fr
一覧
| 同位体核種
|
Z(p)
|
N(n)
|
同位体質量 (u)
|
半減期
|
核スピン数
|
天然存在比
|
天然存在比
(範囲)
|
| 励起エネルギー
|
| 199Fr
|
87
|
112
|
199.00726(4)
|
16(7) ms
|
1/2+#
|
|
|
| 200Fr
|
87
|
113
|
200.00657(8)
|
24(10) ms
|
3+#
|
|
|
| 200mFr
|
60(110) keV
|
650(210) ms
|
10-#
|
|
|
| 201Fr
|
87
|
114
|
201.00386(8)
|
67(3) ms
|
(9/2-)
|
|
|
| 202Fr
|
87
|
115
|
202.00337(5)
|
290(30) ms
|
(3+)
|
|
|
| 202mFr
|
330(90)# keV
|
340(40) ms
|
(10-)
|
|
|
| 203Fr
|
87
|
116
|
203.000925(17)
|
0.55(2) s
|
(9/2-)#
|
|
|
| 204Fr
|
87
|
117
|
204.000653(26)
|
1.7(3) s
|
(3+)
|
|
|
| 204m1Fr
|
50(4) keV
|
2.6(3) s
|
(7+)
|
|
|
| 204m2Fr
|
326(4) keV
|
1.7(6) s
|
(10-)
|
|
|
| 205Fr
|
87
|
118
|
204.998594(8)
|
3.80(3) s
|
(9/2-)
|
|
|
| 206Fr
|
87
|
119
|
205.99867(3)
|
~16 s
|
(2+,3+)
|
|
|
| 206m1Fr
|
190(40) keV
|
15.9(1) s
|
(7+)
|
|
|
| 206m2Fr
|
730(40) keV
|
700(100) ms
|
(10-)
|
|
|
| 207Fr
|
87
|
120
|
206.99695(5)
|
14.8(1) s
|
9/2-
|
|
|
| 208Fr
|
87
|
121
|
207.99714(5)
|
59.1(3) s
|
7+
|
|
|
| 209Fr
|
87
|
122
|
208.995954(16)
|
50.0(3) s
|
9/2-
|
|
|
| 210Fr
|
87
|
123
|
209.996408(24)
|
3.18(6) min
|
6+
|
|
|
| 211Fr
|
87
|
124
|
210.995537(23)
|
3.10(2) min
|
9/2-
|
|
|
| 212Fr
|
87
|
125
|
211.996202(28)
|
20.0(6) min
|
5+
|
|
|
| 213Fr
|
87
|
126
|
212.996189(8)
|
34.6(3) s
|
9/2-
|
|
|
| 214Fr
|
87
|
127
|
213.998971(9)
|
5.0(2) ms
|
(1-)
|
|
|
| 214m1Fr
|
123(6) keV
|
3.35(5) ms
|
(8-)
|
|
|
| 214m2Fr
|
638(6) keV
|
103(4) ns
|
(11+)
|
|
|
| 214m3Fr
|
6477+Y keV
|
108(7) ns
|
(33+)
|
|
|
| 215Fr
|
87
|
128
|
215.000341(8)
|
86(5) ns
|
9/2-
|
|
|
| 216Fr
|
87
|
129
|
216.003198(15)
|
0.70(2) µs
|
(1-)
|
|
|
| 217Fr
|
87
|
130
|
217.004632(7)
|
16.8(19) µs
|
9/2-
|
|
|
| 218Fr
|
87
|
131
|
218.007578(5)
|
1.0(6) ms
|
1-
|
|
|
| 218m1Fr
|
86(4) keV
|
22.0(5) ms
|
|
|
|
| 218m2Fr
|
200(150)# keV
|
|
high
|
|
|
| 219Fr
|
87
|
132
|
219.009252(8)
|
20(2) ms
|
9/2-
|
|
|
| 220Fr
|
87
|
133
|
220.012327(4)
|
27.4(3) s
|
1+
|
|
|
| 221Fr
|
87
|
134
|
221.014255(5)
|
4.9(2) min
|
5/2-
|
|
|
| 222Fr
|
87
|
135
|
222.017552(23)
|
14.2(3) min
|
2-
|
|
|
| 223Fr
|
87
|
136
|
223.0197359(26)
|
22.00(7) min
|
3/2(-)
|
|
|
| 224Fr
|
87
|
137
|
224.02325(5)
|
3.33(10) min
|
1-
|
|
|
| 225Fr
|
87
|
138
|
225.02557(3)
|
4.0(2) min
|
3/2-
|
|
|
| 226Fr
|
87
|
139
|
226.02939(11)
|
49(1) s
|
1-
|
|
|
| 227Fr
|
87
|
140
|
227.03184(11)
|
2.47(3) min
|
1/2+
|
|
|
| 228Fr
|
87
|
141
|
228.03573(22)#
|
38(1) s
|
2-
|
|
|
| 229Fr
|
87
|
142
|
229.03845(4)
|
50.2(4) s
|
(1/2+)#
|
|
|
| 230Fr
|
87
|
143
|
230.04251(48)#
|
19.1(5) s
|
|
|
|
| 231Fr
|
87
|
144
|
231.04544(50)#
|
17.6(6) s
|
(1/2+)#
|
|
|
| 232Fr
|
87
|
145
|
232.04977(69)#
|
5(1) s
|
|
|
|
参考文献
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.
