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Periodic Table of Elements

Am - Americium

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Nuclides / Isotopes

Nuc- lide	Atomic Mass	NN	Abun %	Spin	Half Life	DM	DT	BR %	Decay Energy (MeV)
Am231	231.046	136	Syn
Am232	232.047	137	Syn		79s	ε	Pu232	~98
					79s	α	Np228	~2	7.200
Am233	233.046	138	Syn			ε	Pu234	99.96	4.170
						α	Np230	0.04	6.870
Am234	234.048	139	Syn		2.32m
Am235	235.048	140	Syn		15m
Am236	236.05	141	Syn			α	Np232		6.450
						ε	Pu236		3.280
Am237	237.05	142	Syn	5/2-	73m	ε	Pu237	99.98	1.730
					73m	α	Np233	0.03	6.250
meta state 2.400MeV			Syn		5ns	SF		<=100
Am238	238.052	143	Syn	1+	98m	ε	Pu238	>99.99	2.260
					98m	α	Np234	0.0001	6.040
Am239	239.053	144	Syn	5/2-	11.9h	ε	Pu234	99.99	0.803
					11.9h	α	Np235	0.01	5.924
Am240	240.0553	145	Syn	3-	50.8h	α	Np236	1.9E^-4	5.710
					50.8h	ε
					50.8h	ε	Pu240		1.379
meta state 3.000MeV			Syn		0.924ms	SF		<=100
Am241	241.0568	146	Syn	5/2-	432.2y	SF		4E^-10
					432.2y	α	Np237		5.638
meta state 2.200MeV			Syn		1.2us
Am242	242.0595	147	Syn	1-	16.02h	β^-	Cm242	82.70	0.665
					16.02h	ε	Pu242	17.30	0.751
meta state 0.048MeV			Syn	5-	141y	IT		99.54	0.049
					141y	α	Np238	0.46	5.637
					141y	SF		1.5E^-8
meta state 2.200MeV			Syn		14ms	SF		~100
					14ms	α	Np238	<1.5	7.788
					14ms	IT		>0	2.200
Am243	243.0614	148	Syn	5/2-	7370y	SF		3.7E^-9
					7370y	α	Np239		5.438
Am244	244.0643	149	Syn	6-	10.1h	β^-	Cm244		1.428
meta state 0.000MeV 0.000MeV			Syn		~6.5us	SF		<=100
meta state 0.088MeV			Syn	1+	~26m	β^-	Cm244	99.96	1.516
					~26m	ε	Pu244	0.04	0.164
Am245	245.0665	150	Syn	5/2+	2.05h	β^-	Cm245		0.894
Am246	246.0698	151	Syn	7-	39m	β^-	Cm246		2.376
meta state 0.000MeV			Syn	2-	25m	IT	Am246	<0.01
					25m	β^-	Cm246		2.376
Am247	247.072	152	Syn	5/2	23m	β^-	Cm247		1.700
Am248	248.076	153	Syn			β^-	Cm248		3.100
Am249	249.078	154	Syn

Nuclide	Potential Parent Nuclides
Am231	None known
Am232	None known
Am233	None known
Am234	Pu243 (Syn)
Am235	None known
Am236	None known
Am237	None known
meta state 2.400MeV	None known
Am238	Cm238 (Syn)
Am239	Bk243 (Syn)
Am240	Bk244 (Syn) Cm240 (Syn)
meta state 3.000MeV	None known
Am241	Bk245 (Syn) Cm241 (Syn) Pu241 (Syn)
meta state 2.200MeV	None known
Am242	Bk246 (Syn)
meta state 0.048MeV	None known
meta state 2.200MeV	None known
Am243	Bk247 (Syn) Cm243 (Syn)
Am244	Bk248 (Syn) Bk248m (Syn)
meta state 0.000MeV 0.000MeV	None known
meta state 0.088MeV	None known
Am245	Bk249 (Syn) Pu245 (Syn)
Am246	Am246m (Syn) Pu246 (Syn)
meta state 0.000MeV	None known
Am247	Bk251 (Syn) Pu247 (Syn)
Am248	None known
Am249	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

Am - Americium

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