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Isotopes of Chromium

List, data and properties of all known isotopes of Chromium as well as radioactive decay products and intermediate products.

 

Chromium isotopes

All atomic nuclei of the chemical element chromium are summarized under chromium isotopes; these all consist of an atomic nucleus with 24 protons and, in the uncharged state, 24 electrons. The difference between each chromium isotope is based on the number of neutrons in the nucleus.

 

Naturally Occurring Chromium Isotopes

In nature, 4 isotopes of chromium occur in different forms:

Atomic Mass maQuantityHalf-lifeSpin
Chromium
Isotopic mixture
51,9961 u100 %
Isotope 50Cr49,9460414(5) u4,345(13) %1.3 × 1018 a0+
Isotope 52Cr51,940506(4) u83,789(18) %stable0+
Isotope 53Cr52,940648(4) u9,501(17) %stable3/2-
Isotope 54Cr53,938879(4) u2,365(7) %stable0+

 

Isotope Table: Chromium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
41Cr244117Chromium-4141.02 u
[41.0068344 u]
{18.62988 MeV}
42Mn
42Cr244218Chromium-4242.00722(43) u
[41.9940544 u]
{6.72539 MeV}
0+43Mn
43Cr244319Chromium-4342.99788(43) u
[42.9847144 u]
{-1.97477 MeV}
(3/2+)44Mn
44Cr244420Chromium-4443.98566(32) u
[43.9724944 u]
{-13.35762 MeV}
0+45Mn
45Cr244521Chromium-4544.97905(4) u
[44.9658844 u]
{-19.5148 MeV}
(7/2-)
45mCr244521Chromium-45m44.97905(4) u
[44.9658844 u]
{-19.5148 MeV}
3/2+~
46Cr244622Chromium-4645.968359(21) u
[45.9551934 u]
{-29.4734 MeV}
0+46Mn
47Cr244723Chromium-4746.962896(6) u
[46.9497304 u]
{-34.56215 MeV}
3/2-47Mn
48Cr244824Chromium-4847.954029(8) u
[47.9408634 u]
{-42.82171 MeV}
0+48Mn
49Cr244925Chromium-4948.9513330(24) u
[48.9381674 u]
{-45.33302 MeV}
5/2-0.476(3)49Mn
50Cr245026Chromium-5049.9460414(5) u
[49.9328758 u]
{-50.26211 MeV}
0+50Mn
50V
51Cr245127Chromium-5150.9447647(4) u
[50.9315991 u]
{-51.45135 MeV}
7/2-(-)0.934(5)51Mn
52Cr245228Chromium-5251.940506(4) u
[51.9273404 u]
{-55.4183 MeV}
0+52Mn
52V
53Cr245329Chromium-5352.940648(4) u
[52.9274824 u]
{-55.28603 MeV}
3/2--0.47431(7)53Mn
53V
54Cr245430Chromium-5453.938879(4) u
[53.9257134 u]
{-56.93384 MeV}
0+54Mn
54V
55Cr245531Chromium-5554.9408373(4) u
[54.9276717 u]
{-55.1097 MeV}
3/2-55V
56Cr245632Chromium-5655.9406491(6) u
[55.9274835 u]
{-55.28501 MeV}
0+56V
57Cr245733Chromium-5756.9436124(11) u
[56.9304468 u]
{-52.52471 MeV}
(3/2)-0.083457V
58Cr245834Chromium-5857.9441845(16) u
[57.9310189 u]
{-51.9918 MeV}
0+58V
59Cr245935Chromium-5958.94838(23) u
[58.9352144 u]
{-48.08372 MeV}
(1/2-)59V
59mCr245935Chromium-59m58.94838(23) u
[58.9352144 u]
{-48.08372 MeV}
(9/2+)
60Cr246036Chromium-6059.94990(21) u
[59.9367344 u]
{-46.66785 MeV}
0+60V
61Cr246137Chromium-6160.95440(11) u
[60.9412344 u]
{-42.47613 MeV}
(5/2-)61V
62Cr246238Chromium-6261.95610(16) u
[61.9429344 u]
{-40.89259 MeV}
0+62V
63Cr246339Chromium-6362.96134(38) u
[62.9481744 u]
{-36.01156 MeV}
1/2-63V
64Cr246440Chromium-6463.96406(47) u
[63.9508944 u]
{-33.47789 MeV}
0+64V
65Cr246541Chromium-6564.96970(32) u
[64.9565344 u]
{-28.22427 MeV}
(1/2-)65V
66Cr246642Chromium-6665.97346(43) u
[65.9602944 u]
{-24.72185 MeV}
0+
67Cr246743Chromium-6766.97955(75) u
[66.9663844 u]
{-19.04905 MeV}
1/2-~
68Cr246844Chromium-6867.98411(54) u
[67.9709444 u]
{-14.80144 MeV}
0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Cr-41p → 40V
Cr-4213.3(10) msβ+42V
EC p → 41Ti

94.4(50) %
14.35(45) MeV
AL
Cr-4321.2(7) msEC β+43V
EC, p → 42Ti
EC, 2p → 41Sc
EC, 3p → 40Ca

79.3(30) %
11.6(10) %
0.13 %
15.95(40) MeV


AL
Cr-4442.8(6) msEC β+44V
EC, p → 43Ti
93 %
7(3) %
10.76(35) MeV
AL
Cr-4560.9(4) msβ+45V
β+, p → 44Ti
65.6 %
34.4 %
12.47(49) MeV
AL
Cr-45m0.001 s~50AL
Cr-460.26(6) sEC β+46V100 %7.604(11) MeVAL
Cr-47500(15) msEC β+47V100 %7.444(6) MeVAL
Cr-4821.56(3) hEC/β+48V100 %1.656(7) MeVAL
Cr-4942.3(1) minβ+49V100 %2.6289(24) MeVAL
Cr-501.3 × 1018 a2 EC ? AL
Cr-5127.704(4) dEC → 51V100 %0.7524(6) MeVAL
Cr-52stableAL
Cr-53stableAL
Cr-54stableAL
Cr-553.497(3) minβ-55Mn100 %2.6027(4) MeVAL
Cr-565.94(10) minβ-56Mn100 %1.6265(6) MeVAL
Cr-5721.1(10) sβ-57Mn100 %4.9615(18) MeVAL
Cr-587.0(3) sβ-58Mn100 %3.836(3) MeVAL
Cr-590.74(28) sβ-59Mn100 %7.44(22) MeVAL
Cr-59m96(20) μsIso → 59Cr100 %502.7(11) keVAL
Cr-600.49(1) sβ-60Mn
β-, n → 59Mn

?
6.30(19) MeV
0.78(19) MeV
AL
Cr-61237(11) msβ-61Mn
β-, n → 60Mn
100 %
?
9.27(10) MeV
2.42(19) MeV
AL
Cr-62206(12) msβ-62Mn
β- , n → 61Mn
100 %
?
7.63(15) MeV
2.78(15) MeV
AL
Cr-63129(2) msβ-63Mn
β- , n → 62Mn
100 %
?
10.88(36) MeV
4.45(36) MeV
AL
Cr-6443(1) msβ-64Mn
β-, n → → 63Mn
100 %
?
9.51(44) MeV
5.34(44) MeV
AL
Cr-6527(3) msβ-65Mn100 %12.75(39) MeVAL
Cr-6624(2) msβ-66Mn100 %12.03(40) MeVAL
Cr-67300 nsβ-67MnAL
Cr-68360 nsβ-68Mn
β-, n → 67Mn
100 %
?
13.58(64) MeV
10.59(58) MeV
AL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Chromium isotope.
6 - Relative atomic mass of the Chromium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Chromium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Chromium nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
53Cr
9,501(17) %
3/2-
-0,47431(7)- 1,512- 15,0(50)2,41150,00091
0,2832

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Chromium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Cr-48106 Bq100 Bq/g21.6 h
Cr-49106 Bq10 Bq/g41.9 min
Cr-51107 Bq100 Bq/g2 TBq100 Bq cm-227.7 d

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Chromium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Chromium: NMR properties - 53Cr-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - K. Garofali, R. Robinson, M. Thoennessen:
Discovery of chromium, manganese, nickel, and copper isotopes.
In: Atomic Data and Nuclear Data Tables, (2012), DOI 10.1016/j.adt.2011.11.002.

[10] - Martin Schiller, Elishevah Van Kooten, Jesper C. Holst, Mia B. Olsena, Martin Bizzarro:
Precise measurement of chromium isotopes by MC-ICPMS.
In: Journal of Analytical Atomic Spectrometry, (2014), DOI 10.1039/C4JA00018H.

 


Category: Isotopes

Last update: 05.07.2020



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