Yttrium-100m

Properties and data of the isotope ¹⁰⁰Y.

Content

General data

Name of the isotope:Yttrium-100m; Y-100mSymbol:¹⁰⁰Y or 10039YMass number A:100 (= number of nucleons)Atomic number Z:39 (= number of protons)Neutrons N:61Isotopic mass:99.927721(12) u (atomic weight of Yttrium-100m)
Excitation energy: 145(15) keVNuclide mass:99.9063273 u (calculated nuclear mass without electrons)Mass excess:-67.32745 MeVMass defect:0.90601512399999 u (per nucleus)Nuclear binding energy:843.94765192 MeV (per nucleus)
8.43947652 MeV (average binding energy per nucleon)Half-life:0.94(3) sDecay constant λ:0.73739061761696 s^-1Specific activity α:4.485525422308 × 10⁺²¹ Bq g^-1
121230416819.14 Ci g^-1Spin and parity:
(nuclear angular momentum)(3.4.5)

Radioactive Decay

Half-life T_½ = 0.94(3) s respectively 9.4 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁰Zr	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
¹⁰⁰Y		735(7) ms	1-, 2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 61) and isobaric (same nucleon number A = 100) with Yttrium-100m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 61	Isobar A = 100
34	⁹⁵Se
35	⁹⁶Br
36	⁹⁷Kr	¹⁰⁰Kr
37	⁹⁸Rb	¹⁰⁰Rb
38	⁹⁹Sr	¹⁰⁰Sr
39	¹⁰⁰Y	¹⁰⁰Y
40	¹⁰¹Zr	¹⁰⁰Zr
41	¹⁰²Nb	¹⁰⁰Nb
42	¹⁰³Mo	¹⁰⁰Mo
43	¹⁰⁴Tc	¹⁰⁰Tc
44	¹⁰⁵Ru	¹⁰⁰Ru
45	¹⁰⁶Rh	¹⁰⁰Rh
46	¹⁰⁷Pd	¹⁰⁰Pd
47	¹⁰⁸Ag	¹⁰⁰Ag
48	¹⁰⁹Cd	¹⁰⁰Cd
49	¹¹⁰In	¹⁰⁰In
50	¹¹¹Sn	¹⁰⁰Sn
51	¹¹²Sb
52	¹¹³Te
53	¹¹⁴I
54	¹¹⁵Xe
55	¹¹⁶Cs
56	¹¹⁷Ba
57	¹¹⁸La
58	¹¹⁹Ce