Platinum-197m

Properties and data of the isotope ¹⁹⁷Pt.

Content

General data

Name of the isotope:Platinum-197m; Pt-197mSymbol:¹⁹⁷Pt or 19778PtMass number A:197 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:119Isotopic mass:196.9673431(6) u (atomic weight of Platinum-197m)
Excitation energy: 399.59(20) keVNuclide mass:196.9245584 u (calculated nuclear mass without electrons)Mass excess:-30.41971 MeVMass defect:1.6741344 u (per nucleus)Nuclear binding energy:1559.44614879 MeV (per nucleus)
7.9159703 MeV (average binding energy per nucleon)Half-life:95.41(18) minDecay constant λ:0.00012108220322118 s^-1Specific activity α:3.720275935864 × 10⁺¹⁷ Bq g^-1
10054799.82666 Ci g^-1Spin and parity:
(nuclear angular momentum)13/2+

Radioactive Decay

Half-life T_½ = 95.41(18) min (minutes) respectively 5.7246 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹⁷Au	3.3(4) %
Iso	¹⁹⁷Pt	96.7(4) %

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
¹⁹⁷Pt		19.8915(19) h	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 119) and isobaric (same nucleon number A = 197) with Platinum-197m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 119	Isobar A = 197
73	¹⁹²Ta
74	¹⁹³W	¹⁹⁷W
75	¹⁹⁴Re	¹⁹⁷Re
76	¹⁹⁵Os	¹⁹⁷Os
77	¹⁹⁶Ir	¹⁹⁷Ir
78	¹⁹⁷Pt	¹⁹⁷Pt
79	¹⁹⁸Au	¹⁹⁷Au
80	¹⁹⁹Hg	¹⁹⁷Hg
81	²⁰⁰Tl	¹⁹⁷Tl
82	²⁰¹Pb	¹⁹⁷Pb
83	²⁰²Bi	¹⁹⁷Bi
84	²⁰³Po	¹⁹⁷Po
85	²⁰⁴At	¹⁹⁷At
86	²⁰⁵Rn	¹⁹⁷Rn
87	²⁰⁶Fr
88	²⁰⁷Ra
89	²⁰⁸Ac
90	²⁰⁹Th