Platinum-169

Properties and data of the isotope ¹⁶⁹Pt.

Content

General data

Name of the isotope:Platinum-169; Pt-169Symbol:¹⁶⁹Pt or 16978PtMass number A:169 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:91Isotopic mass:168.98657(21) u (atomic weight of Platinum-169)Nuclide mass:168.9437853 u (calculated nuclear mass without electrons)Mass excess:-12.50996 MeVMass defect:1.412289852 u (per nucleus)Nuclear binding energy:1315.5395234 MeV (per nucleus)
7.78425753 MeV (average binding energy per nucleon)Separation energy:S_N = 9.58(25) MeV (first neutron)
S_P = 1.13(20) MeV (first proton)Half-life:7.0(2) msDecay constant λ:99.021025794278 s^-1Specific activity α:3.549515270408 × 10⁺²³ Bq g^-1
9593284514616.8 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1981

Radioactive Decay

Half-life T_½ = 7.0(2) ms respectively 7 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁵Os	ca. 100 %	6.858(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 169) with Platinum-169. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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