Platinum-171m

Properties and data of the isotope ¹⁷¹Pt.

Content

General data

Name of the isotope:Platinum-171m; Pt-171mSymbol:¹⁷¹Pt or 17178PtMass number A:171 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:93Isotopic mass:170.98125(8) u (atomic weight of Platinum-171m)
Excitation energy: 412.6(10) keVNuclide mass:170.9384653 u (calculated nuclear mass without electrons)Mass excess:-17.46551 MeVMass defect:1.434939684 u (per nucleus)Nuclear binding energy:1336.63770601 MeV (per nucleus)
7.81659477 MeV (average binding energy per nucleon)Half-life:901(9) nsDecay constant λ:769308.74645943 s^-1Specific activity α:2.725226844682 × 10⁺²⁷ Bq g^-1
7.365477958601 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(13/2+)

Radioactive Decay

Half-life T_½ = 901(9) ns respectively 9.01 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁷¹Pt	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
¹⁷¹Pt		45.5(25) ms	(7/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 171) with Platinum-171m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 93	Isobar A = 171
54	¹⁴⁷Xe
55	¹⁴⁸Cs
56	¹⁴⁹Ba
57	¹⁵⁰La
58	¹⁵¹Ce
59	¹⁵²Pr
60	¹⁵³Nd
61	¹⁵⁴Pm
62	¹⁵⁵Sm
63	¹⁵⁶Eu
64	¹⁵⁷Gd
65	¹⁵⁸Tb	¹⁷¹Tb
66	¹⁵⁹Dy	¹⁷¹Dy
67	¹⁶⁰Ho	¹⁷¹Ho
68	¹⁶¹Er	¹⁷¹Er
69	¹⁶²Tm	¹⁷¹Tm
70	¹⁶³Yb	¹⁷¹Yb
71	¹⁶⁴Lu	¹⁷¹Lu
72	¹⁶⁵Hf	¹⁷¹Hf
73	¹⁶⁶Ta	¹⁷¹Ta
74	¹⁶⁷W	¹⁷¹W
75	¹⁶⁸Re	¹⁷¹Re
76	¹⁶⁹Os	¹⁷¹Os
77	¹⁷⁰Ir	¹⁷¹Ir
78	¹⁷¹Pt	¹⁷¹Pt
79	¹⁷²Au	¹⁷¹Au
80	¹⁷³Hg	¹⁷¹Hg