Fluorine-18m

Properties and data of the isotope ^18mF.

Contents

See also: List of individual Fluorine isotopes (and general data sources).

General data

Name of the isotope:Fluorine-18m; F-18mSymbol:^18mF or 18m9FMass number A:18 (= number of nucleons)Atomic number Z:9 (= number of protons)Neutrons N:9Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1 (= neutron-proton ratio)Neutron excess (N-Z):0Excitation energy:1121.36(15) keVIsotopic mass:18.0009373(5) u (atomic weight of Fluorine-18m)Nuclide mass:17.9960001 u (calculated nuclear mass without electrons)Mass excess:0.87309 MeVMass defect:0.147472232 u (per nucleus)Nuclear binding energy:137.36949927 MeV (per nucleus)
7.63163885 MeV (average binding energy per nucleon)Half-life:162(7) nsDecay constant λ:4278686.2997527 s^-1Specific activity α:1.431417194314 × 10⁺²⁹ Bq g^-1
3.868695119768 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)5+Isobaric spin: 0Quadrupole moment Q:0.071(6) barn (100 fm²)

Radioactive Decay

Half-life T_½ = 162(7) ns respectively 1.62 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁸F	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
¹⁸F		109.734(8) min	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 9) and isobaric (same nucleon number A = 18) with Fluorine-18m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 9	Isobar A = 18
3	¹²Li
4	¹³Be
5	¹⁴B	¹⁸B
6	¹⁵C	¹⁸C
7	¹⁶N	¹⁸N
8	¹⁷O	¹⁸O
9	¹⁸F	¹⁸F
10	¹⁹Ne	¹⁸Ne
11	²⁰Na	¹⁸Na
12	²¹Mg	¹⁸Mg
13	²²Al
14	²³Si
15	²⁴P