銫嘅同位素
銫嘅同位素之中只係有一個是穩定嘅，佢係133Cs，其餘嘅都係唔穩定。但係唔穩定嘅銫同位素中，仍有半衰期非常長嘅銫同位素，例如135Cs，半衰期有成2.3×106年，但係由於佢唔喺半衰鏈上，換句話講，唔會有其它元素，喺衰變後產生放射性同位素，或者能夠衰變成呢尐嘢嘅同位素本身唔穩定或難以存在，因此導致133Cs嘅豐度係100%。
圖表
編輯| 符號 | Z（p） | N（n） | 質量（u） | 半衰期 | 原子核自旋 | 相對豐度 | 相對豐度變化率 |
|---|---|---|---|---|---|---|---|
| 激發能量 | |||||||
| 112Cs | 55 | 57 | 111.95030(33)# | 500(100) µs | 1+# | ||
| 113Cs | 55 | 58 | 112.94449(11) | 16.7(7) µs | 5/2+# | ||
| 114Cs | 55 | 59 | 113.94145(33)# | 0.57(2) s | (1+) | ||
| 115Cs | 55 | 60 | 114.93591(32)# | 1.4(8) s | 9/2+# | ||
| 116Cs | 55 | 61 | 115.93337(11)# | 0.70(4) s | (1+) | ||
| 116mCs | 100(60)# keV | 3.85(13) s | 4+,5,6 | ||||
| 117Cs | 55 | 62 | 116.92867(7) | 8.4(6) s | (9/2+)# | ||
| 117mCs | 150(80)# keV | 6.5(4) s | 3/2+# | ||||
| 118Cs | 55 | 63 | 117.926559(14) | 14(2) s | 2 | ||
| 118mCs | 100(60)# keV | 17(3) s | (7-) | ||||
| 119Cs | 55 | 64 | 118.922377(15) | 43.0(2) s | 9/2+ | ||
| 119mCs | 50(30)# keV | 30.4(1) s | 3/2(+) | ||||
| 120Cs | 55 | 65 | 119.920677(11) | 61.2(18) s | 2(-#) | ||
| 120mCs | 100(60)# keV | 57(6) s | (7-) | ||||
| 121Cs | 55 | 66 | 120.917229(15) | 155(4) s | 3/2(+) | ||
| 121mCs | 68.5(3) keV | 122(3) s | 9/2(+) | ||||
| 122Cs | 55 | 67 | 121.91611(3) | 21.18(19) s | 1+ | ||
| 122m1Cs | 45.8 keV | >1 µs | (3)+ | ||||
| 122m2Cs | 140(30) keV | 3.70(11) min | 8- | ||||
| 122m3Cs | 127.0(5) keV | 360(20) ms | (5)- | ||||
| 123Cs | 55 | 68 | 122.912996(13) | 5.88(3) min | 1/2+ | ||
| 123m1Cs | 156.27(5) keV | 1.64(12) s | (11/2)- | ||||
| 123m2Cs | 231.63+X keV | 114(5) ns | (9/2+) | ||||
| 124Cs | 55 | 69 | 123.912258(9) | 30.9(4) s | 1+ | ||
| 124mCs | 462.55(17) keV | 6.3(2) s | (7)+ | ||||
| 125Cs | 55 | 70 | 124.909728(8) | 46.7(1) min | 1/2(+) | ||
| 125mCs | 266.6(11) keV | 900(30) ms | (11/2-) | ||||
| 126Cs | 55 | 71 | 125.909452(13) | 1.64(2) min | 1+ | ||
| 126m1Cs | 273.0(7) keV | >1 µs | |||||
| 126m2Cs | 596.1(11) keV | 171(14) µs | |||||
| 127Cs | 55 | 72 | 126.907418(6) | 6.25(10) h | 1/2+ | ||
| 127mCs | 452.23(21) keV | 55(3) µs | (11/2)- | ||||
| 128Cs | 55 | 73 | 127.907749(6) | 3.640(14) min | 1+ | ||
| 129Cs | 55 | 74 | 128.906064(5) | 32.06(6) h | 1/2+ | ||
| 130Cs | 55 | 75 | 129.906709(9) | 29.21(4) min | 1+ | ||
| 130mCs | 163.25(11) keV | 3.46(6) min | 5- | ||||
| 131Cs | 55 | 76 | 130.905464(5) | 9.689(16) d | 5/2+ | ||
| 132Cs | 55 | 77 | 131.9064343(20) | 6.480(6) d | 2+ | ||
| 133Cs | 55 | 78 | 132.905451933(24) | 穩定 | 7/2+ | 1.0000 | |
| 134Cs | 55 | 79 | 133.906718475(28) | 2.0652(4) a | 4+ | ||
| 134mCs | 138.7441(26) keV | 2.912(2) h | 8- | ||||
| 135Cs | 55 | 80 | 134.9059770(11) | 2.3(3)E+6 a | 7/2+ | ||
| 135mCs | 1632.9(15) keV | 53(2) min | 19/2- | ||||
| 136Cs | 55 | 81 | 135.9073116(20) | 13.16(3) d | 5+ | ||
| 136mCs | 518(5) keV | 19(2) s | 8- | ||||
| 137Cs | 55 | 82 | 136.9070895(5) | 30.1671(13) a | 7/2+ | ||
| 138Cs | 55 | 83 | 137.911017(10) | 33.41(18) min | 3- | ||
| 138mCs | 79.9(3) keV | 2.91(8) min | 6- | ||||
| 139Cs | 55 | 84 | 138.913364(3) | 9.27(5) min | 7/2+ | ||
| 140Cs | 55 | 85 | 139.917282(9) | 63.7(3) s | 1- | ||
| 141Cs | 55 | 86 | 140.920046(11) | 24.84(16) s | 7/2+ | ||
| 142Cs | 55 | 87 | 141.924299(11) | 1.689(11) s | 0- | ||
| 143Cs | 55 | 88 | 142.927352(25) | 1.791(7) s | 3/2+ | ||
| 144Cs | 55 | 89 | 143.932077(28) | 994(4) ms | 1(-#) | ||
| 144mCs | 300(200)# keV | <1 s | (>3) | ||||
| 145Cs | 55 | 90 | 144.935526(12) | 582(6) ms | 3/2+ | ||
| 146Cs | 55 | 91 | 145.94029(8) | 0.321(2) s | 1- | ||
| 147Cs | 55 | 92 | 146.94416(6) | 0.235(3) s | (3/2+) | ||
| 148Cs | 55 | 93 | 147.94922(62) | 146(6) ms | |||
| 149Cs | 55 | 94 | 148.95293(21)# | 150# ms [>50 ms] | 3/2+# | ||
| 150Cs | 55 | 95 | 149.95817(32)# | 100# ms [>50 ms] | |||
| 151Cs | 55 | 96 | 150.96219(54)# | 60# ms [>50 ms] | 3/2+# | ||
備註：有#嘅數據代表冇經過實驗嘅證明，只係理論推測，而用咗括號括係代表數據唔確定。
參攷
編輯- 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.
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