Promethium-152m1

Properties and data of the isotope ¹⁵²Pm.

Content

General data

Name of the isotope:Promethium-152m1; Pm-152m1Symbol:¹⁵²Pm or 15261PmMass 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-152m1)
Excitation energy: 150(9) 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:7.52(8) minDecay constant λ:0.0015362304533687 s^-1Specific activity α:6.12675243941 × 10⁺¹⁸ Bq g^-1
165587903.76786 Ci g^-1Spin and parity:
(nuclear angular momentum)4-

Radioactive Decay

Half-life T_½ = 7.52(8) min (minutes) respectively 4.512 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵²Sm	100 %

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+
^152m2Pm	150+x keV	13.8(2) min	(8)

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-152m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	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