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Periodic Table of Elements

Pr - Praseodymium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Pr121		62	Syn		1.4s
Pr122	121.952	63	Syn
Pr123	122.946	64	Syn
Pr124	123.943	65	Syn		1.2s	ε	Ce124		11.600
					1.2s	ε + P	La123		8.300
Pr125	124.938	66	Syn		3.3s
Pr126	125.935	67	Syn	3, 4, 5	3.14s	ε	Ce126	>0	10.400
					3.14s	ε + P	La125		6.300
Pr127	126.931	68	Syn	11/2-	4.2s	ε	Ce127		7.500
Pr128	127.929	69	Syn	4, 5, 6	3.1s	ε	Ce128		9.300
					3.1s	ε + P	La127		4.500
Pr129	128.925	70	Syn	3/2+	30s	ε	Ce129	>0	6.300
Pr130	129.923	71	Syn		40s	ε	Ce130		8.100
Pr131	130.92	72	Syn	3/2+	1.53m	ε	Ce131		5.250
meta state 0.152MeV			Syn	11/2-	5.7s	IT		95	0.152
					5.7s	ε	Ce131	5	5.402
Pr132	131.919	73	Syn		1.6m	ε	Ce132		7.100
Pr133	132.916	74	Syn	3/2+	6.5m	ε	Ce133		4.300
Pr134	133.916	75	Syn	2-	17m	ε	Ce134		6.200
meta state 0.000MeV			Syn	5-	~11m	ε	Ce134		6.200
Pr135	134.913	76	Syn	3/2+	24m	ε	Ce135		3.720
Pr136	135.9126	77	Syn	2+	13.1m	ε	Ce136		5.126
Pr137	136.9107	78	Syn	5/2+	1.28h	ε	Ce137		2.702
Pr138	137.9107	79	Syn	1+	1.45m	ε	Ce138		4.437
meta state 0.364MeV			Syn	7-	2.12h	ε	Ce138		4.801
Pr139	138.9089	80	Syn	5/2+	4.41h	ε	Ce139		2.129
Pr140	139.9091	81	Syn	1+	3.39m	ε	Ce140		3.388
Pr141	140.9077	82	100.	5/2+	Stable
Pr142	141.91	83	Syn	2-	19.12h	β^-	Nd142	99.98	2.162
					19.12h	ε	Ce142	0.02	0.745
meta state 0.004MeV			Syn	5-	14.6m	IT			0.004
Pr143	142.9108	84	Syn	7/2+	13.57d	β^-	Nd143		0.934
Pr144	143.9133	85	Syn	0-	17.28m	β^-	Nd144		2.997
meta state 0.059MeV			Syn	3-	7.2m	IT		99.93	0.059
					7.2m	β^-	Nd144	0.07	3.056
Pr145	144.9145	86	Syn	7/2+	5.984h	β^-	Nd145		1.805
Pr146	145.9176	87	Syn	2-	24.15m	β^-	Nd146		4.200
Pr147	146.919	88	Syn	3/2+	13.4m	β^-	Nd147		2.690
Pr148	147.9222	89	Syn	1-	2.27m	β^-	Nd148		4.930
meta state 0.090MeV			Syn	4	2m	β^-	Nd148		5.020
Pr149	148.9238	90	Syn	5/2+	2.26m	β^-	Nd149		3.397
Pr150	149.927	91	Syn	1-	6.19s	β^-	Nd150		5.690
Pr151	150.9282	92	Syn	3/2-	18.9s	β^-	Nd151		4.100
Pr152	151.932	93	Syn	4-	3.63s	β^-	Nd152		6.400
Pr153	152.934	94	Syn		4.28s	β^-	Nd153		5.500
Pr154	153.937	95	Syn	3+, 2+	2.3s	β^-	Nd154		7.900
Pr155	154.94	96	Syn
Pr156	155.944	97	Syn
Pr157	156.947	98	Syn
Pr158	157.952	99	Syn
Pr159	158.955	100	Syn

Nuclide	Potential Parent Nuclides
Pr121	None known
Pr122	None known
Pr123	None known
Pr124	None known
Pr125	None known
Pr126	None known
Pr127	Nd127 (Syn)
Pr128	Nd128 (Syn)
Pr129	Nd129 (Syn) Pm130 (Syn)
Pr130	Nd130 (Syn)
Pr131	Nd131 (Syn) Pm132 (Syn)
meta state 0.152MeV	None known
Pr132	Nd132 (Syn)
Pr133	Nd133 (Syn)
Pr134	Nd134 (Syn)
meta state 0.000MeV	None known
Pr135	Nd135 (Syn) Nd135m (Syn)
Pr136	Nd136 (Syn)
Pr137	Nd137 (Syn)
Pr138	Nd138 (Syn)
meta state 0.364MeV	None known
Pr139	Nd139 (Syn) Nd139m (Syn)
Pr140	Nd140 (Syn)
Pr141	Ce141 (Syn) Nd141 (Syn) Nd141m (Syn) Pm145 (Syn)
Pr142	None known
meta state 0.004MeV	None known
Pr143	Ce143 (Syn)
Pr144	Ce144 (Syn)
meta state 0.059MeV	None known
Pr145	Ce145 (Syn)
Pr146	Ce146 (Syn)
Pr147	Ce147 (Syn)
Pr148	Ce148 (Syn)
meta state 0.090MeV	None known
Pr149	Ce149 (Syn)
Pr150	Ce150 (Syn)
Pr151	Ce151 (Syn)
Pr152	Ce152 (Syn)
Pr153	None known
Pr154	None known
Pr155	None known
Pr156	None known
Pr157	None known
Pr158	None known
Pr159	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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Periodic Table of Elements

Pr - Praseodymium

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