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Periodic Table of Elements

Pm - Promethium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Pm128	127.948	67	Syn
Pm129	128.943	68	Syn
Pm130	129.94	69	Syn		2.2s	ε	Nd130		10.900
					2.2s	ε + P	Pr129		7.200
Pm131	130.936	70	Syn
Pm132	131.934	71	Syn	3+	6.3s	ε + P	Pr131	~5.0E^-5	5.500
					6.3s	ε	Nd132		9.900
Pm133	132.93	72	Syn	3/2+		ε	Nd133		7.000
Pm134	133.928	73	Syn	2+	~5s	ε	Nd134		8.900
meta state 0.000MeV			Syn	5+	22s	ε	Nd134		8.900
Pm135	134.925	74	Syn	11/2-	45s	ε	Nd135		5.940
meta state 0.000MeV			Syn	2+, 5/2+	49s	ε	Nd135		5.940
Pm136	135.923	75	Syn	2+	47s	ε	Nd136		7.850
meta state 0.000MeV			Syn	5-	107s	ε	Nd136		7.850
Pm137	136.921	76	Syn	11/2-	2.4m	ε	Nd137		5.580
Pm138	137.919	77	Syn	1+	10s	ε	Nd138		6.900
meta state 0.000MeV			Syn	5-	3.24m	ε	Nd138		6.900
Pm139	138.9168	78	Syn	5/2+	4.15m	ε	Nd139		4.520
meta state 0.189MeV			Syn	11/2-	180ms	ε	Nd139		4.709
					180ms	IT			0.189
Pm140	139.9158	79	Syn	1+	9.2s	ε	Nd140		6.090
meta state 0.000MeV			Syn	7-	5.95m	ε	Nd140		6.090
Pm141	140.9136	80	Syn	5/2+	20.9m	ε	Nd141		3.715
Pm142	141.913	81	Syn	1+	40.5s	ε	Nd142		4.870
Pm143	142.9109	82	Syn	5/2+	265d	ε	Nd143		1.041
Pm144	143.9126	83	Syn	5-	363d	ε	Nd144		2.332
Pm145	144.9127	84	Syn	5/2+	17.7y	α	Pr141	3.0E^-7	2.322
					17.7y	ε	Nd145		0.163
Pm146	145.9147	85	Syn	3-	5.53y	ε	Nd146	66	1.472
					5.53y	β^-	Sm146	34	1.542
Pm147	146.9151	86	Syn	7/2+	2.6234y	β^-	Sm147		0.224
Pm148	147.9175	87	Syn	1-	5.370d	β^-	Sm148		2.468
meta state 0.138MeV			Syn	6-	41.29d	β^-	Sm148	95	2.606
					41.29d	IT		5	0.138
Pm149	148.9183	88	Syn	7/2+	53.08h	β^-	Sm149		1.071
Pm150	149.921	89	Syn	1-	2.68h	β^-	Sm150		3.454
Pm151	150.9212	90	Syn	5/2+	28.4h	β^-	Sm151		1.187
Pm152	151.9235	91	Syn	1+	4.12m	β^-	Sm152		3.500
meta state 0.150MeV			Syn	4-	7.52m	β^-	Sm152		3.650
Pm153	152.9241	92	Syn	5/2-	5.25m	β^-	Sm153		1.900
Pm154	153.9265	93	Syn	0, 1	1.73m	β^-	Sm154		4.050
meta state 0.000MeV			Syn	3, 4	2.68m	β^-	Sm154		4.050
Pm155	154.9281	94	Syn	5/2-	41.5s	β^-	Sm155		3.170
Pm156	155.9311	95	Syn	4-	26.7s	β^-	Sm156		5.160
Pm157	156.933	96	Syn	5/2-	10.56s	β^-	Sm157		4.500
Pm158	157.937	97	Syn		4.8s	β^-	Sm158		6.200
Pm159	158.939	98	Syn
Pm160	159.943	99	Syn
Pm161	160.946	100	Syn
Pm162	161.95	101	Syn
Pm163	162.954	102	Syn

Nuclide	Potential Parent Nuclides
Pm128	None known
Pm129	None known
Pm130	None known
Pm131	Sm131 (Syn)
Pm132	Sm132 (Syn)
Pm133	Eu134 (Syn) Sm133 (Syn)
Pm134	Eu135 (Syn) Sm134 (Syn)
meta state 0.000MeV	None known
Pm135	Eu136 (Syn) Eu136m (Syn) Sm135 (Syn)
meta state 0.000MeV	None known
Pm136	Sm136 (Syn)
meta state 0.000MeV	None known
Pm137	Sm137 (Syn)
Pm138	Sm138 (Syn)
meta state 0.000MeV	None known
Pm139	Sm139 (Syn)
meta state 0.189MeV	None known
Pm140	Sm140 (Syn)
meta state 0.000MeV	None known
Pm141	Sm141 (Syn) Sm141m (Syn)
Pm142	Sm142 (Syn)
Pm143	Eu147 (Syn) Sm143 (Syn) Sm143m (Syn)
Pm144	Eu148 (Syn)
Pm145	Sm145 (Syn)
Pm146	None known
Pm147	Nd147 (Syn)
Pm148	None known
meta state 0.138MeV	None known
Pm149	Nd149 (Syn)
Pm150	None known
Pm151	Nd151 (Syn)
Pm152	Nd152 (Syn)
meta state 0.150MeV	None known
Pm153	Nd153 (Syn)
Pm154	Nd154 (Syn)
meta state 0.000MeV	None known
Pm155	Nd155 (Syn)
Pm156	Nd156 (Syn)
Pm157	None known
Pm158	None known
Pm159	None known
Pm160	None known
Pm161	None known
Pm162	None known
Pm163	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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Periodic Table of Elements

Pm - Promethium

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