Silver-122m2

Properties and data of the isotope ¹²²Ag.

Content

General data

Name of the isotope:Silver-122m2; Ag-122m2Symbol:¹²²Ag or 12247AgMass number A:122 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:75Isotopic mass:121.92366(4) u (atomic weight of Silver-122m2)
Excitation energy: 80(50) keVNuclide mass:121.8978781 u (calculated nuclear mass without electrons)Mass excess:-71.11025 MeVMass defect:1.093985204 u (per nucleus)Nuclear binding energy:1019.04065361 MeV (per nucleus)
8.35279224 MeV (average binding energy per nucleon)Half-life:0.20(5) sDecay constant λ:3.4657359027997 s^-1Specific activity α:1.724888412396 × 10⁺²² Bq g^-1
466186057404.51 Ci g^-1Spin and parity:
(nuclear angular momentum)(9-)

Radioactive Decay

Half-life T_½ = 0.20(5) s respectively 2.0 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²²Cd	?
β^-, n	¹²¹Cd	?

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
¹²²Ag		529(13) ms	(3+)
^122m1Ag	+x keV	0.55(5) s	(1-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 122) with Silver-122m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 75	Isobar A = 122
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru	¹²²Ru
45	¹²⁰Rh	¹²²Rh
46	¹²¹Pd	¹²²Pd
47	¹²²Ag	¹²²Ag
48	¹²³Cd	¹²²Cd
49	¹²⁴In	¹²²In
50	¹²⁵Sn	¹²²Sn
51	¹²⁶Sb	¹²²Sb
52	¹²⁷Te	¹²²Te
53	¹²⁸I	¹²²I
54	¹²⁹Xe	¹²²Xe
55	¹³⁰Cs	¹²²Cs
56	¹³¹Ba	¹²²Ba
57	¹³²La	¹²²La
58	¹³³Ce	¹²²Ce
59	¹³⁴Pr	¹²²Pr
60	¹³⁵Nd
61	¹³⁶Pm
62	¹³⁷Sm
63	¹³⁸Eu
64	¹³⁹Gd
65	¹⁴⁰Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm