Cesium: Properties: Isotopes

Cesium: Properties

Isotopes

Natural
Abun. (%) Atomic
Mass Half-
life Decay Mode
/Energy (/MeV) Part. En.
/Intensity
(MeV/%) Cross-sect.
Ther. Neut.
(b) Spin
(h/2 pi) Magnetic
Dipl.Mom.
(nm) Electric
Quad. Mom.
(b) Gamma En.
/Intensity
(MeV/%)
¹¹³Cs 112.9333 33µs p
¹¹⁴Cs 113.94127 0.58s ß⁺,E.C./ 12.4 1⁺ rad. an.
0.6826
0.7088
¹¹⁵Cs 114.93607 1.4s ß⁺,E.C./ 9 rad. an.
^116mCs 0.7s ß⁺,E.C. rad. an.
0.3935
¹¹⁶Cs 115.93311 3.8s ß⁺,E.C./ 10.8 rad. an.
0.3935
0.5243
0.6151
0.6223
^117mCs 6.5s ß⁺,E.C.
¹¹⁷Cs 116.9287 8.4s ß⁺,E.C./ 7.9 rad. an.
^118mCs 17s ß⁺,E.C.
¹¹⁸Cs 117.92674 14s ß⁺,E.C./ 9.7 2⁺ rad. an.
0.3372
0.4727
0.5868
0.5906
^119mCs 28s 3/2⁺
¹¹⁹Cs 118.92249 38s ß⁺,E.C./ 6.5 9/2⁺ 5.5 nm 2.8 b rad. an.
0.169
0.176
0.224
0.257
^120mCs 60s ß⁺,E.C.
¹²⁰Cs 119.9208 64s ß⁺,E.C./ 8 2⁺ 3.87 nm 1.45 b rad. an.
0.3224
0.4735
0.5534
0.3 - 3.28
^121mCs 2m I.T.,ß⁺
4.4 9/2⁺ 5.41 nm 2.7 b rad. an.
0.1794
0.1961
¹²¹Cs 120.91725 2.3m ß⁺,E.C./ 5.4 4.38 3/2⁺ 0.77 nm 0.84 b rad. an.
0.1537
0.08 - 0.56
^122mCs 4.4m ß⁺,E.C. 9^- 4.77 nm 3.3 b rad. an.
^122mCs 0.36m I.T. 0.3311
0.4971
0.6385
0.27 - 2.22
¹²²Cs 121.91609 21s ß⁺,E.C./ 6.9 5.8 1⁺ -0.133 nm -0.19 b rad. an.
0.3311
0.512
0.8179
^123mCs 1.6s I.T. 11/2^- Cs k x rays
0.0946
¹²³Cs 122.91299 5.87m ß⁺/ 4.19
E.C. 3 1/2⁺ 1.38 nm rad. an.
Xe k x rays
0.0974
0.5964
^124mCs 6.3s I.T. 7⁺
¹²⁴Cs 123.91227 30s ß⁺/ 5.92
E.C. 5 1⁺ 0.673 nm -0.74 b rad. an.
Xe k x rays
0.3539
0.4925
0.9418
¹²⁵Cs 124.909725 45m ß⁺/ 3.08
E.C. 2.06 1/2⁺ 1.41 nm rad. an.
Xe k x rays
0.112
0.526
¹²⁶Cs 125.909465 1.64m ß⁺/ 4.83
E.C. 3.4
3.7 1⁺ 0.78 nm -0.68 b rad. an.
Xe k x rays
0.3886
0.4912
0.9252
¹²⁷Cs 126.907428 6.2h ß⁺/ 2.08
E.C. 0.65
1.06 1/2⁺ 1.46 nm Xe k x rays
0.1247
0.4119
¹²⁸Cs 127.907755 3.62m ß⁺/ 3.93
E.C. 2.44
2.88 1⁺ 0.97 nm -0.57 b rad. an.
Xe k x rays
0.4429
¹²⁹Cs 128.906027 1.336d E.C./ 1.192 1/2⁺ 1.49 nm Xe k x rays
0.3719
0.4115
^130mCs 3.5m I.T.,ß⁺,E.C. 5^-
¹³⁰Cs 129.906753 29.21m ß⁺/ 3.03
E.C. 1.98 1⁺ 1.46 nm -0.06 b rad. an.
Xe k x rays
0.5361
¹³¹Cs 130.905444 9.69d E.C./ 0.35 5/2⁺ 3.54 nm -0.58 b Xe k x rays
¹³²Cs 131.906431 6.48d E.C.,ß⁺/ 2.121
ß^-/ 1.28 2^- 2.22 nm 0.51 b Xe k x rays
0.4646
0.6302
0.66769
¹³³Cs 100 % 132.905429 29 b 7/2⁺ 2.582 nm -0.0037 b
^134mCs 2.91h I.T./ 0.139 8^- 1.098 nm 1 b Cs k x rays
0.12749
¹³⁴Cs 133.906696 2.065y ß^-/ 2.059 0.089/ 27
0.658/ 70 140 b 4⁺ 2.994 nm 0.39 b 0.56327
0.56935
0.60473
0.79584
^135mCs 53m I.T./ 1.627 19/2^- 2.18 nm 0.9 b 0.7869
0.8402
¹³⁵Cs 134.905885 2.3x10⁶y ß^-/ 0.205 0.205/ 100 8.9 b 7/2⁺ 2.732 nm 0.05 b
^136mCs 19s I.T. 8⁺
¹³⁶Cs 135.907289 13.16d ß^-/ 2.549 0.341 5⁺ 3.71 nm 0.2 b 0.06691
0.34057
0.8185
1.04807
¹³⁷Cs 136.907073 30.3y ß^-/ 1.176 0.514/ 95 0.25 b 7/2⁺ 2.84 nm 0.05 b Ba k x rays
0.66164
^138mCs 2.9m I.T./ 0.08
ß^-
3.3 6^- 1.71 nm -0.4 b Cs k x rays
0.0799
0.1917
0.4628
1.43579
¹³⁸Cs 137.911004 32.2m ß^-/ 5.38 2.9 3^- 0.7 nm 0.12 b 0.1381
0.46269
1.00969
1.43579
2.21788
¹³⁹Cs 138.913349 9.3m ß^-/ 4.21 4.21 7/2⁺ 2.7 nm -0.07 b 0.6272
1.2832
0.4 - 3.66
¹⁴⁰Cs 139.917256 1.06m ß^-/ 6.22 5.7
6.21 1^- 0.01339 nm -0.11 b 0.5283
0.6023
0.9084
0.41 - 3.94
¹⁴¹Cs 140.920006 24.9s ß^-/ 5.26 5.2 7/2⁺ 2.44 nm -0.4 b Ba k x rays
0.0485
0.5616
0.5887
1.194
0.05 - 3.33
¹⁴²Cs 141.92422 1.8s ß^-/ 7.31 6.9
7.28 0.3596
0.9668
1.1759
1.3265
¹⁴³Cs 142.92722 1.78s ß^-/ 6.23 6.1 3/2⁺ 0.87 nm 0.47 b 0.1955
0.2324
0.3064
0.17 - 1.98
¹⁴⁴Cs 143.93193 1.01s ß^-/ 8.47 8.46
7.9 1⁺ -0.546 nm 0.3 b 0.1993
0.5598
0.6392
0.7587
¹⁴⁵Cs 144.93532 0.59s ß^-/ 7.9 7.4
7.9 3/2⁺ 0.784 nm 0.6 b 0.1126
0.1755
0.199
¹⁴⁶Cs 145.9402 0.322s ß^-/ 6
2p 9 2^-
¹⁴⁷Cs 146.94385 0.227s ß^-/ 6
2p
¹⁴⁸Cs 147.94892 0.15s ß^-/ 6
ß^-alpha

	Natural Abun. (%)	Atomic Mass	Half- life	Decay Mode /Energy (/MeV)	Part. En. /Intensity (MeV/%)	Cross-sect. Ther. Neut. (b)	Spin (h/2 pi)	Magnetic Dipl.Mom. (nm)	Electric Quad. Mom. (b)	Gamma En. /Intensity (MeV/%)
¹¹³Cs		112.9333	33µs	p
¹¹⁴Cs		113.94127	0.58s	ß⁺,E.C./ 12.4			1⁺			rad. an. 0.6826 0.7088
¹¹⁵Cs		114.93607	1.4s	ß⁺,E.C./ 9						rad. an.
^116mCs			0.7s	ß⁺,E.C.						rad. an. 0.3935
¹¹⁶Cs		115.93311	3.8s	ß⁺,E.C./ 10.8						rad. an. 0.3935 0.5243 0.6151 0.6223
^117mCs			6.5s	ß⁺,E.C.
¹¹⁷Cs		116.9287	8.4s	ß⁺,E.C./ 7.9						rad. an.
^118mCs			17s	ß⁺,E.C.
¹¹⁸Cs		117.92674	14s	ß⁺,E.C./ 9.7			2⁺			rad. an. 0.3372 0.4727 0.5868 0.5906
^119mCs			28s				3/2⁺
¹¹⁹Cs		118.92249	38s	ß⁺,E.C./ 6.5			9/2⁺	5.5 nm	2.8 b	rad. an. 0.169 0.176 0.224 0.257
^120mCs			60s	ß⁺,E.C.
¹²⁰Cs		119.9208	64s	ß⁺,E.C./ 8			2⁺	3.87 nm	1.45 b	rad. an. 0.3224 0.4735 0.5534 0.3 - 3.28
^121mCs			2m	I.T.,ß⁺	4.4		9/2⁺	5.41 nm	2.7 b	rad. an. 0.1794 0.1961
¹²¹Cs		120.91725	2.3m	ß⁺,E.C./ 5.4	4.38		3/2⁺	0.77 nm	0.84 b	rad. an. 0.1537 0.08 - 0.56
^122mCs			4.4m	ß⁺,E.C.			9^-	4.77 nm	3.3 b	rad. an.
^122mCs			0.36m	I.T.						0.3311 0.4971 0.6385 0.27 - 2.22
¹²²Cs		121.91609	21s	ß⁺,E.C./ 6.9	5.8		1⁺	-0.133 nm	-0.19 b	rad. an. 0.3311 0.512 0.8179
^123mCs			1.6s	I.T.			11/2^-			Cs k x rays 0.0946
¹²³Cs		122.91299	5.87m	ß⁺/ 4.19 E.C.	3		1/2⁺	1.38 nm		rad. an. Xe k x rays 0.0974 0.5964
^124mCs			6.3s	I.T.			7⁺
¹²⁴Cs		123.91227	30s	ß⁺/ 5.92 E.C.	5		1⁺	0.673 nm	-0.74 b	rad. an. Xe k x rays 0.3539 0.4925 0.9418
¹²⁵Cs		124.909725	45m	ß⁺/ 3.08 E.C.	2.06		1/2⁺	1.41 nm		rad. an. Xe k x rays 0.112 0.526
¹²⁶Cs		125.909465	1.64m	ß⁺/ 4.83 E.C.	3.4 3.7		1⁺	0.78 nm	-0.68 b	rad. an. Xe k x rays 0.3886 0.4912 0.9252
¹²⁷Cs		126.907428	6.2h	ß⁺/ 2.08 E.C.	0.65 1.06		1/2⁺	1.46 nm		Xe k x rays 0.1247 0.4119
¹²⁸Cs		127.907755	3.62m	ß⁺/ 3.93 E.C.	2.44 2.88		1⁺	0.97 nm	-0.57 b	rad. an. Xe k x rays 0.4429
¹²⁹Cs		128.906027	1.336d	E.C./ 1.192			1/2⁺	1.49 nm		Xe k x rays 0.3719 0.4115
^130mCs			3.5m	I.T.,ß⁺,E.C.			5^-
¹³⁰Cs		129.906753	29.21m	ß⁺/ 3.03 E.C.	1.98		1⁺	1.46 nm	-0.06 b	rad. an. Xe k x rays 0.5361
¹³¹Cs		130.905444	9.69d	E.C./ 0.35			5/2⁺	3.54 nm	-0.58 b	Xe k x rays
¹³²Cs		131.906431	6.48d	E.C.,ß⁺/ 2.121 ß^-/ 1.28			2^-	2.22 nm	0.51 b	Xe k x rays 0.4646 0.6302 0.66769
¹³³Cs	100 %	132.905429				29 b	7/2⁺	2.582 nm	-0.0037 b
^134mCs			2.91h	I.T./ 0.139			8^-	1.098 nm	1 b	Cs k x rays 0.12749
¹³⁴Cs		133.906696	2.065y	ß^-/ 2.059	0.089/ 27 0.658/ 70	140 b	4⁺	2.994 nm	0.39 b	0.56327 0.56935 0.60473 0.79584
^135mCs			53m	I.T./ 1.627			19/2^-	2.18 nm	0.9 b	0.7869 0.8402
¹³⁵Cs		134.905885	2.3x10⁶y	ß^-/ 0.205	0.205/ 100	8.9 b	7/2⁺	2.732 nm	0.05 b
^136mCs			19s	I.T.			8⁺
¹³⁶Cs		135.907289	13.16d	ß^-/ 2.549	0.341		5⁺	3.71 nm	0.2 b	0.06691 0.34057 0.8185 1.04807
¹³⁷Cs		136.907073	30.3y	ß^-/ 1.176	0.514/ 95	0.25 b	7/2⁺	2.84 nm	0.05 b	Ba k x rays 0.66164
^138mCs			2.9m	I.T./ 0.08 ß^-	3.3		6^-	1.71 nm	-0.4 b	Cs k x rays 0.0799 0.1917 0.4628 1.43579
¹³⁸Cs		137.911004	32.2m	ß^-/ 5.38	2.9		3^-	0.7 nm	0.12 b	0.1381 0.46269 1.00969 1.43579 2.21788
¹³⁹Cs		138.913349	9.3m	ß^-/ 4.21	4.21		7/2⁺	2.7 nm	-0.07 b	0.6272 1.2832 0.4 - 3.66
¹⁴⁰Cs		139.917256	1.06m	ß^-/ 6.22	5.7 6.21		1^-	0.01339 nm	-0.11 b	0.5283 0.6023 0.9084 0.41 - 3.94
¹⁴¹Cs		140.920006	24.9s	ß^-/ 5.26	5.2		7/2⁺	2.44 nm	-0.4 b	Ba k x rays 0.0485 0.5616 0.5887 1.194 0.05 - 3.33
¹⁴²Cs		141.92422	1.8s	ß^-/ 7.31	6.9 7.28					0.3596 0.9668 1.1759 1.3265
¹⁴³Cs		142.92722	1.78s	ß^-/ 6.23	6.1		3/2⁺	0.87 nm	0.47 b	0.1955 0.2324 0.3064 0.17 - 1.98
¹⁴⁴Cs		143.93193	1.01s	ß^-/ 8.47	8.46 7.9		1⁺	-0.546 nm	0.3 b	0.1993 0.5598 0.6392 0.7587
¹⁴⁵Cs		144.93532	0.59s	ß^-/ 7.9	7.4 7.9		3/2⁺	0.784 nm	0.6 b	0.1126 0.1755 0.199
¹⁴⁶Cs		145.9402	0.322s	ß^-/ 6 2p	9		2^-
¹⁴⁷Cs		146.94385	0.227s	ß^-/ 6 2p
¹⁴⁸Cs		147.94892	0.15s	ß^-/ 6 ß^-alpha