Promethium-152m2

Properties and data of the isotope ^152m2Pm.

Contents

General data

Name of the isotope:Promethium-152m2; Pm-152m2Symbol:^152m2Pm or 152m261PmMass number A:152 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:91Isotopic mass:151.923505(28) u (atomic weight of Promethium-152m2)
Excitation energy: 150+x keVNuclide mass:151.8900442 u (calculated nuclear mass without electrons)Mass excess:-71.25463 MeVMass defect:1.342329308 u (per nucleus)Nuclear binding energy:1250.37169643 MeV (per nucleus)
8.22612958 MeV (average binding energy per nucleon)Half-life:13.8(2) minDecay constant λ:0.00083713427603858 s^-1Specific activity α:3.338636111910 × 10⁺¹⁸ Bq g^-1
90233408.430024 Ci g^-1Spin and parity:
(nuclear angular momentum)(8)

Radioactive Decay

Half-life T_½ = 13.8(2) min (minutes) respectively 8.28 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵²Sm	> 99 %
Iso	¹⁵²Pm	<< 1 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁵²Pm		4.12(8) min	1+
^152m1Pm	150(9) keV	7.52(8) min	4-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 152) with Promethium-152m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 91	Isobar A = 152
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba	¹⁵²Ba
57	¹⁴⁸La	¹⁵²La
58	¹⁴⁹Ce	¹⁵²Ce
59	¹⁵⁰Pr	¹⁵²Pr
60	¹⁵¹Nd	¹⁵²Nd
61	¹⁵²Pm	¹⁵²Pm
62	¹⁵³Sm	¹⁵²Sm
63	¹⁵⁴Eu	¹⁵²Eu
64	¹⁵⁵Gd	¹⁵²Gd
65	¹⁵⁶Tb	¹⁵²Tb
66	¹⁵⁷Dy	¹⁵²Dy
67	¹⁵⁸Ho	¹⁵²Ho
68	¹⁵⁹Er	¹⁵²Er
69	¹⁶⁰Tm	¹⁵²Tm
70	¹⁶¹Yb	¹⁵²Yb
71	¹⁶²Lu	¹⁵²Lu
72	¹⁶³Hf
73	¹⁶⁴Ta
74	¹⁶⁵W
75	¹⁶⁶Re
76	¹⁶⁷Os
77	¹⁶⁸Ir
78	¹⁶⁹Pt
79	¹⁷⁰Au
80	¹⁷¹Hg