Curium: Properties: Isotopes

Curium: 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/%)
²³⁶Cm 236.05139
²³⁷Cm 237.05276
²³⁸Cm 238.05302 2.4h E.C./ 0.96
alpha/ 6.632 6.52 0⁺
²³⁹Cm 239.05484 3h E.C./ 1.7 0.0407
0.1466
0.1874
²⁴⁰Cm 240.055503 27d alpha/ 6.397 5.989/ 0.014
6.147/ 0.05
6.2478/ 28.8
6.2906/ 70.6 0⁺
²⁴¹Cm 241.057645 4 alpha/ 6.184
5.8842/ 0.12
5.9291/ 0.18
5.9389/ 0.69 1/2⁺ Am k x rays
0.13241
0.16505
0.18028
0.43063
0.47181
²⁴²Cm 242.05883 162.8d alpha/ 6.216 5.9694/ 0.035
6.069/ 25
6.1129/ 74 20 b 0⁺ Pu L x rays
0.04408
0.10189
0.04 - 1.2
²⁴³Cm 243.061381 28.5y alpha/ 6.167 5.6856/ 1.6
5.742/ 10.6
5.7859/ 73.3
5.9922/ 6.5
6.0589/ 5 130 b 5/2⁺ 0.41 nm Pu L x rays
Pu k x rays
0.10612
0.20975
0.22819
0.2776
0.28546
0.33431
0.04 - 0.7
²⁴⁴Cm 244.062747 18.11y alpha/ 5.902 5.6656/ 0.02
5.7528/ 24
5.805/ 76 15 b 0⁺ Pu L x rays
0.04282
0.09885
0.15262
²⁴⁵Cm 245.065483 8500y alpha/ 5.623 5.235/ 0.3
5.3038/ 5
5.362/ 93
5.4927/ 0.8
5.5331/ 0.6 350 b 7/2⁺ 0.5 nm Pu L x rays
Pu k x rays
0.04195
0.13299
0.13606
0.17494
²⁴⁶Cm 246.067218 4780y alpha/ 5.476 5.343/ 21
5.386/ 79 1.2 b 0⁺ Pu L x rays
0.04453
²⁴⁷Cm 247.070347 1.56x10⁷y alpha/ 5.352 4.818/ 4.7
4.869/ 71
4.982/ 2
5.2104/ 5.7
5.2659/ 13.8 60 b 9/2^- 0.37 nm Pu k x rays
0.2792
0.2886
0.3471
0.4035
²⁴⁸Cm 248.072343 3.4x10⁵y alpha/ 5.162
S.E. 4.931/ 0.07
5.0349/ 16.5
5.0784/ 1 2.6 b 0⁺
²⁴⁹Cm 249.075948 64.15m ß^-/ 0.902 0.9 1.6 b 1/2⁺ Bk k x rays
0.56039
0.63431
²⁵⁰Cm 250.078352 9700y S.E.,alpha/ 5.27 80 b 0⁺
²⁵¹Cm 251.08229 16.8m ß^-/ 1.42 0.9/ 16 1/2⁺ 0.3896
0.5299
0.5425

	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/%)
²³⁶Cm		236.05139
²³⁷Cm		237.05276
²³⁸Cm		238.05302	2.4h	E.C./ 0.96 alpha/ 6.632	6.52		0⁺
²³⁹Cm		239.05484	3h	E.C./ 1.7						0.0407 0.1466 0.1874
²⁴⁰Cm		240.055503	27d	alpha/ 6.397	5.989/ 0.014 6.147/ 0.05 6.2478/ 28.8 6.2906/ 70.6		0⁺
²⁴¹Cm		241.057645	4	alpha/ 6.184	5.8842/ 0.12 5.9291/ 0.18 5.9389/ 0.69		1/2⁺			Am k x rays 0.13241 0.16505 0.18028 0.43063 0.47181
²⁴²Cm		242.05883	162.8d	alpha/ 6.216	5.9694/ 0.035 6.069/ 25 6.1129/ 74	20 b	0⁺			Pu L x rays 0.04408 0.10189 0.04 - 1.2
²⁴³Cm		243.061381	28.5y	alpha/ 6.167	5.6856/ 1.6 5.742/ 10.6 5.7859/ 73.3 5.9922/ 6.5 6.0589/ 5	130 b	5/2⁺	0.41 nm		Pu L x rays Pu k x rays 0.10612 0.20975 0.22819 0.2776 0.28546 0.33431 0.04 - 0.7
²⁴⁴Cm		244.062747	18.11y	alpha/ 5.902	5.6656/ 0.02 5.7528/ 24 5.805/ 76	15 b	0⁺			Pu L x rays 0.04282 0.09885 0.15262
²⁴⁵Cm		245.065483	8500y	alpha/ 5.623	5.235/ 0.3 5.3038/ 5 5.362/ 93 5.4927/ 0.8 5.5331/ 0.6	350 b	7/2⁺	0.5 nm		Pu L x rays Pu k x rays 0.04195 0.13299 0.13606 0.17494
²⁴⁶Cm		246.067218	4780y	alpha/ 5.476	5.343/ 21 5.386/ 79	1.2 b	0⁺			Pu L x rays 0.04453
²⁴⁷Cm		247.070347	1.56x10⁷y	alpha/ 5.352	4.818/ 4.7 4.869/ 71 4.982/ 2 5.2104/ 5.7 5.2659/ 13.8	60 b	9/2^-	0.37 nm		Pu k x rays 0.2792 0.2886 0.3471 0.4035
²⁴⁸Cm		248.072343	3.4x10⁵y	alpha/ 5.162 S.E.	4.931/ 0.07 5.0349/ 16.5 5.0784/ 1	2.6 b	0⁺
²⁴⁹Cm		249.075948	64.15m	ß^-/ 0.902	0.9	1.6 b	1/2⁺			Bk k x rays 0.56039 0.63431
²⁵⁰Cm		250.078352	9700y	S.E.,alpha/ 5.27		80 b	0⁺
²⁵¹Cm		251.08229	16.8m	ß^-/ 1.42	0.9/ 16		1/2⁺			0.3896 0.5299 0.5425