Radon-215

Properties and data of the isotope ²¹⁵Rn.

Content

General data

Name of the isotope:Radon-215; Rn-215Symbol:²¹⁵Rn or 21586RnMass number A:215 (= number of nucleons)Atomic number Z:86 (= number of protons)Neutrons N:129Isotopic mass:214.998745(8) u (atomic weight of Radon-215)Nuclide mass:214.9515728 u (calculated nuclear mass without electrons)Mass excess:-1.16902 MeVMass defect:1.791981916 u (per nucleus)Nuclear binding energy:1669.22040286 MeV (per nucleus)
7.76381583 MeV (average binding energy per nucleon)Separation energy:S_N = 4.920(12) MeV (first neutron)
S_P = 5.078(9) MeV (first proton)Half-life:2.30(10) μsDecay constant λ:301368.33937389 s^-1Specific activity α:8.480759768386 × 10⁺²⁶ Bq g^-1
2.292097234699 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Year of discovery:1952

Radioactive Decay

Half-life T_½ = 2.30(10) μs respectively 2.30 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²¹¹Po	100 %	8.839(8) MeV

Parent Nuclides

Direct parent isotope is: ²¹⁹Ra.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 129) and isobaric (same nucleon number A = 215) with Radon-215. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 129	Isobar A = 215
78	²⁰⁷Pt
79	²⁰⁸Au
80	²⁰⁹Hg	²¹⁵Hg
81	²¹⁰Tl	²¹⁵Tl
82	²¹¹Pb	²¹⁵Pb
83	²¹²Bi	²¹⁵Bi
84	²¹³Po	²¹⁵Po
85	²¹⁴At	²¹⁵At
86	²¹⁵Rn	²¹⁵Rn
87	²¹⁶Fr	²¹⁵Fr
88	²¹⁷Ra	²¹⁵Ra
89	²¹⁸Ac	²¹⁵Ac
90	²¹⁹Th	²¹⁵Th
91	²²⁰Pa	²¹⁵Pa
92	²²¹U	²¹⁵U