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Periodic Table of Elements

Cs - Cesium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Cs112	111.95	57	Syn		500us
Cs113	112.945	58	Syn	5/2+	17us	P	Xe112	~100	0.974
Cs114	113.941	59	Syn	1+	0.57s	ε	Xe114	~100	12.400
					0.57s	ε + P	I113	7	9.300
					0.57s	ε + α	Te110	0.16	15.300
					0.57s	α	I110	0.02	3.360
Cs115	114.936	60	Syn		1.4s	ε + P	I114	~0.07	5.800
					1.4s	ε	Xe115		8.800
Cs116	115.933	61	Syn	>4+	3.84s	ε	Xe116		10.500
meta state 0.000MeV			Syn	1+	0.7s	ε	Xe116		10.500
meta state 0.000MeV			Syn	1+	0.7s	ε + α	Te112	>0	12.400
					0.7s	ε + P	I115	>0	6.700
Cs117	116.9286	62	Syn	9/2+	8.4s	ε	Xe117		7.520
meta state 0.150MeV			Syn	3/2+	6.5s	ε	Xe117		7.670
Cs118	117.9266	63	Syn	2	14s	ε + P	I117	<0.04	4.730
					14s	ε + α	Te114	<0.0024	11.080
					14s	ε	Xe118		9.300
meta state 0.000MeV			Syn	7-	17s	ε + P	I117	<0.04	4.730
					17s	ε + α	Te114	<0.0024	11.080
					17s	ε	Xe118		9.300
Cs119	118.9224	64	Syn	9/2+	43s	ε	Xe119		6.330
meta state 0.000MeV			Syn	3/2+	30.4s	ε	Xe119		6.330
Cs120	119.9207	65	Syn	2	64s	ε	Xe120		7.920
					64s	ε + P	I119		2.470
meta state 0.000MeV			Syn		57s	ε	Xe120		7.920
Cs121	120.9172	66	Syn	3/2+	155s	ε	Xe121		5.400
meta state 0.068MeV			Syn	9/2+	122s	ε	Xe121	83	5.468
					122s	IT		17	0.068
Cs122	121.9161	67	Syn	1+	21s	ε	Xe122		7.050
meta state 0.076MeV			Syn	8-	3.7m	ε	Xe122		7.126
meta state 0.127MeV			Syn	5-	0.36s	IT			0.127
Cs123	122.913	68	Syn	1/2+	5.94m	ε	Xe123		4.200
meta state 0.157MeV			Syn	11/2-	1.64s	IT			0.157
Cs124	123.9122	69	Syn	1+	30.8s	ε	Xe124		5.915
meta state 0.462MeV			Syn	7+	6.3s	IT			0.463
Cs125	124.9097	70	Syn	1/2+	45m	ε	Xe125		3.092
Cs126	125.9094	71	Syn	1+	1.64m	ε	Xe126		4.826
Cs127	126.9074	72	Syn	1/2+	6.25h	ε	Xe127		2.085
Cs128	127.9078	73	Syn	1+	3.66m	ε	Xe128		3.930
Cs129	128.9061	74	Syn	1/2+	32.06h	ε	Xe129		1.196
Cs130	129.9067	75	Syn	1+	29.21m	ε	Xe130	98.4	2.983
					29.21m	β^-	Ba130	1.6	0.373
meta state 0.163MeV			Syn	5-	3.46m	IT		99.84	0.163
					3.46m	ε	Xe130	0.16	3.146
Cs131	130.9055	76	Syn	5/2+	9.689d	ε	Xe131		0.352
Cs132	131.9064	77	Syn	2+	6.479d	ε	Xe132	98.13	2.120
					6.479d	β^-	Ba132	1.87	1.280
Cs133	132.9055	78	100.	7/2+	Stable
Cs134	133.9067	79	Syn	4+	2.0648y	ε	Xe134	0.0003	1.229
					2.0648y	β^-	Ba134		2.059
meta state 0.139MeV			Syn	8-	2.903h	IT			0.139
Cs135	134.906	80	Syn	7/2+	2300000y	β^-	Ba135		0.269
meta state 1.633MeV			Syn	19/2-	53m	IT			1.633
Cs136	135.9073	81	Syn	5+	13.16d	β^-	Ba136		2.548
meta state 0.000MeV			Syn	8-	19s	IT	Cs136	>0
					19s	β^-	Ba136		2.548
Cs137	136.9071	82	Syn	7/2+	30.07y	β^-	Ba137		1.176
Cs138	137.911	83	Syn	3-	33.41m	β^-	Ba138		5.373
meta state 0.080MeV			Syn	6-	2.91m	IT		81	0.080
					2.91m	β^-	Ba138	19	5.453
Cs139	138.9134	84	Syn	7/2+	9.27m	β^-	Ba139		4.213
Cs140	139.9173	85	Syn	1-	63.7s	β^-	Ba140		6.219
Cs141	140.92	86	Syn	7/2+	24.94s	β^- + N	Ba140	0.03	0.735
					24.94s	β^-	Ba141		5.255
Cs142	141.9243	87	Syn	0-	1.7s	β^- + N	Ba141	0.09	1.137
					1.7s	β^-	Ba142		7.306
Cs143	142.9273	88	Syn	3/2+	1.78s	β^- + N	Ba142	1.62	2.048
					1.78s	β^-	Ba143		6.243
Cs144	143.932	89	Syn	1	1.01s	β^- + N	Ba143	3.2	2.560
					1.01s	β^-	Ba144		8.465
meta state 0.000MeV			Syn		<1s	β^-	Ba144		8.465
Cs145	144.9354	90	Syn	3/2+	0.594s	β^- + N	Ba144	14.3	3.550
					0.594s	β^-	Ba145		7.890
Cs146	145.9402	91	Syn	1-	0.321s	β^- + N	Ba145	14.2	4.320
					0.321s	β^-	Ba146		9.380
Cs147	146.944	92	Syn	3/2+	0.225s	β^- + N	Ba146	28.5	4.740
					0.225s	β^-	Ba147		9.250
Cs148	147.949	93	Syn		158ms	β^- + N	Ba147	25.1	10.500
					158ms	β^-	Ba148		10.500
Cs149	148.953	94	Syn		>50ms
Cs150	149.958	95	Syn		>50ms
Cs151	150.962	96	Syn

Nuclide	Potential Parent Nuclides
Cs112	None known
Cs113	None known
Cs114	Ba114 (Syn)
Cs115	Ba115 (Syn)
Cs116	Ba116 (Syn)
meta state 0.000MeV	None known
meta state 0.000MeV	None known
Cs117	Ba117 (Syn)
meta state 0.150MeV	None known
Cs118	Ba118 (Syn)
meta state 0.000MeV	None known
Cs119	Ba119 (Syn) La120 (Syn)
meta state 0.000MeV	None known
Cs120	Ba120 (Syn)
meta state 0.000MeV	None known
Cs121	Ba121 (Syn) La122 (Syn)
meta state 0.068MeV	None known
Cs122	Ba122 (Syn)
meta state 0.076MeV	None known
meta state 0.127MeV	None known
Cs123	Ba123 (Syn)
meta state 0.157MeV	None known
Cs124	Ba124 (Syn)
meta state 0.462MeV	None known
Cs125	Ba125 (Syn)
Cs126	Ba126 (Syn)
Cs127	Ba127 (Syn)
Cs128	Ba128 (Syn)
Cs129	Ba129 (Syn) Ba129m (Syn)
Cs130	None known
meta state 0.163MeV	None known
Cs131	Ba131 (Syn)
Cs132	None known
Cs133	Ba133 (Syn) Ba133m (Syn) Xe133 (Syn)
Cs134	None known
meta state 0.139MeV	None known
Cs135	Xe135 (Syn) Xe135m (Syn)
meta state 1.633MeV	None known
Cs136	Cs136m (Syn)
meta state 0.000MeV	None known
Cs137	Xe137 (Syn)
Cs138	Xe138 (Syn)
meta state 0.080MeV	None known
Cs139	Xe139 (Syn)
Cs140	Xe140 (Syn) Xe141 (Syn)
Cs141	Xe141 (Syn) Xe142 (Syn)
Cs142	Xe142 (Syn)
Cs143	Xe143 (Syn)
Cs144	Xe144 (Syn) Xe145 (Syn)
meta state 0.000MeV	None known
Cs145	Xe145 (Syn)
Cs146	None known
Cs147	None known
Cs148	None known
Cs149	None known
Cs150	None known
Cs151	None known
Key: NN = Number of Neutrons Abun % = Natural Abundance (as a percentage) Syn = Synthetic Nuclide (does not occur in nature) DM = Decay Mode α = Alpha emission β^- = Beta emission β^- β^- = Double beta decay β⁺ = Positron emission ε = Electron Capture IT = Isomeric Transition N = Neutron emission P = Proton emission SF = Spontaneous Fission DT = Decays To BR % = Branch Ratio (as a percentage)

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References

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Cs - Cesium

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