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Isotopes of Radon

List, data and properties of all known isotopes of Radon as well as radioactive decay products and intermediate products.

 

Radon isotopes

36 isotopes and several nuclear isomers are known for the chemical element radon. With a half-life of less than 4 days, radon-222 is the most stable radon nuclide.

 

Naturally Occurring Radon Isotopes

Radon occurs in nature in extremely small amounts as intermediate products in natural decay chains: 218Rn, 219Rn, 220Rn, 222< /sup>Rn and 223Rn. Due to the short half-lives, however, these isotopes decay quite quickly and disappear from the environment again.

 

 

Radon-219

219Radon - also: actinon, actinium emanation - is formed in the uranium-actinium series by the decay of 223Radium and further decays to 215Polonium.

 

Radon-220

220Radon - also: thoron, thorium emanation - is formed in the thorium series from 224radium and further decays to 216polonium.

 

Radon-222

222Radon - also: Radon, Radium Emanation, Emanation, Emanon, Niton - is the most stable radon nuclide with a half-life of 3.8 days. It is formed as a radioactive decay product in the uranium-radium series from 226radium and further decays into 218polonium.

 

Isotope Table: Radon

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
193Rn86193107Radon-193193.009708(27) u
[192.9625358 u]
{9.04294 MeV}
(3/2-)
194Rn86194108Radon-194194.006144(18) u
[193.9589718 u]
{5.7231 MeV}
(0+)
195Rn86195109Radon-195195.00542(5) u
[194.9582478 u]
{5.0487 MeV}
3/2-
195mRn86195109Radon-195m195.00542(5) u
[194.9582478 u]
{5.0487 MeV}
13/2+
196Rn86196110Radon-196196.002116(15) u
[195.9549438 u]
{1.97104 MeV}
0+
197Rn86197111Radon-197197.001621(17) u
[196.9544488 u]
{1.50995 MeV}
(3/2-)
197mRn86197111Radon-197m197.001621(17) u
[196.9544488 u]
{1.50995 MeV}
(13/2+)
198Rn86198112Radon-198197.998679(14) u
[197.9515068 u]
{-1.2305 MeV}
0+202Ra
199Rn86199113Radon-199198.99839(4) u
[198.9512178 u]
{-1.49971 MeV}
(3/2-)203Ra
199mRn86199113Radon-199m198.99839(4) u
[198.9512178 u]
{-1.49971 MeV}
(13/2+)
200Rn86200114Radon-200199.995701(15) u
[199.9485288 u]
{-4.00449 MeV}
0+204Ra
200mRn86200114Radon-200m199.995701(15) u
[199.9485288 u]
{-4.00449 MeV}
201Rn86201115Radon-201200.99563(5) u
[200.9484578 u]
{-4.07063 MeV}
(3/2-)205Ra
201mRn86201115Radon-201m200.99563(5) u
[200.9484578 u]
{-4.07063 MeV}
(13/2+)
202Rn86202116Radon-20220.1993264(19) u
[20.1521542 u]
{-169346.23665 MeV}
0+206Ra
203Rn86203117Radon-203202.993394(2) u
[202.9462218 u]
{-6.15345 MeV}
(3/2-)207Ra
203mRn86203117Radon-203m202.993394(2) u
[202.9462218 u]
{-6.15345 MeV}
(13/2+)
204Rn86204118Radon-204203.991444(8) u
[203.9442718 u]
{-7.96986 MeV}
0+208Ra
205Rn86205119Radon-205204.991723(5) u
[204.9445508 u]
{-7.70998 MeV}
5/2-+ 0.802(9)209Ra
206Rn86206120Radon-206205.990195(9) u
[205.9430228 u]
{-9.1333 MeV}
0+210Ra
206Fr
207Rn86207121Radon-207206.990730(9) u
[206.9435578 u]
{-8.63495 MeV}
5/2-+ 0.816(9)211Ra
207Fr
207mRn86207121Radon-207m206.990730(9) u
[206.9435578 u]
{-8.63495 MeV}
13/2+- 0.903(3)
208Rn86208122Radon-208207.989634(12) u
[207.9424618 u]
{-9.65587 MeV}
0+212Ra
208Fr
208mRn86208122Radon-208m207.989634(12) u
[207.9424618 u]
{-9.65587 MeV}
8+6.98(8)
209Rn86209123Radon-209208.990401(11) u
[208.9432288 u]
{-8.94141 MeV}
5/2-0.8388(4)213Ra
209Fr
209m1Rn86209123Radon-209m1208.990401(11) u
[208.9432288 u]
{-8.94141 MeV}
13/2+
209m2Rn86209123Radon-209m2208.990401(11) u
[208.9432288 u]
{-8.94141 MeV}
35/2+
210Rn86210124Radon-210209.989689(5) u
[209.9425168 u]
{-9.60463 MeV}
0+214Ra
210Fr
210m1Rn86210124Radon-210m1209.989689(5) u
[209.9425168 u]
{-9.60463 MeV}
(8+)7.184(56)
210m2Rn86210124Radon-210m2209.989689(5) u
[209.9425168 u]
{-9.60463 MeV}
(17)-17.88(9)
210m3Rn86210124Radon-210m3209.989689(5) u
[209.9425168 u]
{-9.60463 MeV}
(23)+15.42(15)
211Rn86211125Radon-211210.990601(7) u
[210.9434288 u]
{-8.75511 MeV}
1/2-+ 0.601(7)215Ra
211Fr
212Rn86212126Radon-212211.990704(4) u
[211.9435318 u]
{-8.65917 MeV}
0+216Ra
212Fr
213Rn86213127Radon-213212.993885(4) u
[212.9467128 u]
{-5.69609 MeV}
(9/2+)217Ra
213Fr
214Rn86214128Radon-214213.995363(10) u
[213.9481908 u]
{-4.31934 MeV}
0+218Ra
214mRn86214128Radon-214m213.995363(10) u
[213.9481908 u]
{-4.31934 MeV}
(22+)
215Rn86215129Radon-215214.998745(8) u
[214.9515728 u]
{-1.16902 MeV}
9/2+219Ra
216Rn86216130Radon-216216.000271(6) u
[215.9530988 u]
{0.25243 MeV}
0+220Ra
216At
217Rn86217131Radon-217217.003928(5) u
[216.9567558 u]
{3.65891 MeV}
9/2+221Ra
217At
218Rn86218132Radon-218218.0056011(25) u
[217.9584289 u]
{5.21739 MeV}
0+222Ra
218At
219Rn86219133Radon-219219.0094788(23) u
[218.9623066 u]
{8.82945 MeV}
5/2+- 0.442(5)223Ra
219At
220Rn86220134Radon-220220.0113925(19) u
[219.9642203 u]
{10.61205 MeV}
0+224Ra
220At
221Rn86221135Radon-221221.015536(6) u
[220.9683638 u]
{14.47169 MeV}
7/2+- 0.020(1)225Ra
222Rn86222136Radon-222222.0175763(21) u
[221.9704041 u]
{16.37222 MeV}
0+226Ra
223Rn86223137Radon-223223.021889(8) u
[222.9747168 u]
{20.38947 MeV}
7/2- 0.776(8)225Ra
224Rn86224138Radon-224224.024096(11) u
[223.9769238 u]
{22.44528 MeV}
0+
225Rn86225139Radon-225225.028486(12) u
[224.9813138 u]
{26.53454 MeV}
7/2-- 0.696(8)
226Rn86226140Radon-226226.030861(11) u
[225.9836888 u]
{28.74684 MeV}
0+
227Rn86227141Radon-227227.035304(15) u
[226.9881318 u]
{32.88546 MeV}
(5/2)
228Rn86228142Radon-228228.037835(19) u
[227.9906628 u]
{35.24308 MeV}
0+
229Rn86229143Radon-229229.042257(14) u
[228.9950848 u]
{39.36214 MeV}
230Rn86230144Radon-2300+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Rn-1931.15(27) msα → 189Po~ 100 %8.040(12) MeVAL
Rn-1940.78(16) msα → 190Po~ 100 %7.862(10) MeVAL
Rn-195ca. 6 msα → 191Po~ 100 %7.69(5) MeVAL
Rn-195mca. 5 msα → 191Po~ 100 %(59) keVAL
Rn-196ca. 4.4 msα → 192Po
EC/β+196At
99.9(2) %
ca. 0.06 %
7.617(9) MeV
5.89(3) MeV
AL
Rn-197ca. 65 msα → 193Po~ 100 %7.411(7) MeVAL
Rn-197mca. 19 msα → 193Po? 100 %(200 keV)AL
Rn-19865(3) msα → 194Po
EC/β+198At
?
?
7.349(4) MeV
5.584(15) MeV
AL
Rn-1990.59(3) sα → 195Po
EC/β+199At
94 %
6 %
7.132(4) MeV
7.43(4) MeV
AL
Rn-199m0.31(2) sα → 195Po
EC/β+199At
97 %
3 %

180(70) keVAL
Rn-200ca. 1.03 sα → 196Po
EC/β+200At
ca. 86 %
ca. 14 %
7.0434(21) MeV
4.983(28) MeV
AL
Rn-200m25 μs2300.5(5)+x
Rn-2017.0(4) sα → 197Po
EC/β+201At
?
?
6.8607(23) MeV
6.72(5) MeV
AL
Rn-201m3.8(1) sα → 197Po
EC/β+201At
?
?

0 + x keVAL
Rn-2029.7(1) sα → 198Po
EC/β+202At
78(8) %
22(8) %
6.7738(18) MeV
4.32(3) MeV
AL
Rn-20344(2) sα → 199Po
EC/β+203At
66(9) %
34(9) %
6.6299(21) MeV
6.009(21) MeV
AL
Rn-203m26.9(5) sα → 199Po
EC/β+203At
75(10) %
25(10) %

362(5) keVAL
Rn-20474.5(14) sα → 200Po
EC/β+204At
72.4(9) %
27.6(9) %
6.5466(18) MeV
3.905(23) MeV
AL
Rn-205170(4) sα → 201Po
EC/β+205At
24.6(9) %
75.4(9) %
6.3865(18) MeV
5.262(16) MeV
AL
Rn-2065.67(17) minα → 202Po
EC/β+206At
62(3) %
38(3) %
6.3837(16) MeV
3.297(17) MeV
AL
Rn-2079.25(17) minα → 203Po
EC/β+207At
21(3) %
79(3) %
6.2512(16) MeV
4.593(15) MeV
AL
Rn-207m184.5(9) μsIso → 207Rn100 %899.1(10) keVAL
Rn-20824.35(14) minα → 204Po
EC/β+208At
62(7) %
38(7) %
6.2607(17) MeV
2.814(14) MeV
AL
Rn-208m487(12) ns1828.3(4) keV
Rn-20928.5(10) minα → 205Po
EC/β+209At
17(2) %
83(2) %
6.1554(19) MeV
3.942(11) MeV
AL
Rn-209m113.4(13) μs1174.01(13) keV
Rn-209m23.0(3) μs3636.81(23) keV
Rn-2102.4(1) hα → 206Po
EC/β+210At
96(1) %
4(1) %
6.1590(22) MeV
2.367(9) MeV
AL
Rn-210m1644(40) ns1664.6(1) keV
Rn-210m21.06(5) μs3812.40(16) keV
Rn-210m31.04(7) μs6469.02(21) keV
Rn-21114.6(2) hα → 207Po
EC/β+211At
27.4(17) %
72.6(17) %
5.9654(14) MeV
2.892(7) MeV
AL
Rn-21223.9(12) msα → 208Po100 %6.3851(26) MeVAL
Rn-21319.5(1) msα → 209Po100 %8.2451(29) MeVAL
Rn-2140.27(2) μsα → 210Po100 %9.208(9) MeVAL
Rn-214m245(30) ns4595.4 keVAL
Rn-2152.30(10) μsα → 211Po100 %8.839(8) MeVAL
Rn-21645(5) μsα → 212Po100 %8.197(9)AL
Rn-2170.54(5) msα → 213Po100 %7.8872(29) MeVAL
Rn-21835(5) msα → 214Po100 %7.2625(18) MeVAL
Rn-2193.96(1) sα → 215Po100 %6.9462(3) MeVAL
Rn-22055.6(1) sα → 216Po100 %6.40474(10) MeVAL
Rn-22125(2) minα → 217Po
β- 221Fr
22(1) %
78(1) %
6.163(3) MeV
1.194(7) MeV
AL
Rn-2223.8235(3) dα → 218Po100 %5.5904(3) MeVAL
Rn-22324.3(4) minβ- 223Fr100 %2.007(8) MeVAL
Rn-224107(3) minβ- 224Fr100 %0.696(15) MeVAL
Rn-2254.66(4) minβ- 225Fr100 %2.714(16) MeVAL
Rn-2267.4(1) minβ- 226Fr100 %1.227(12) MeVAL
Rn-22720.2(4) sβ- 227Fr100 %3.203(15) MeVAL
Rn-22865(2) sβ- 228Fr100 %1.859(19) MeVAL
Rn-229ca. 12 sβ- 229Fr100 %3.694(14) MeVAL
Rn-230AL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Radon isotope.
6 - Relative atomic mass of the Radon isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Radon isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Radon nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
211Rn

1/2-
+ 0,601(7)9,160,00997
0,2152

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Radon radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Rn-220+107 Bq10000 Bq/gPo-216< 10 min
Rn-222+108 Bq10 Bq/gPo-218, Pb-214,
Bi-214, Po-214
3.8 d

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Radon nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Radon: NMR properties - 211Rn-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

[9] - NN:
Neues Radon-Isotop in die Falle gegangen: 229Rn.
In: Internetchemie News, (2009), DOI https://www.internetchemie.info/news/2009/mar09/radon-229.php.

[10] - NN:
Standard für die Radon-220-Messung. PTB entwickelt weltweit erstes Primärnormal zur Kalibrierung von Thoron-Messgeräten.
In: Internetchemie News, (2011), DOI https://www.internetchemie.info/news/2011/feb11/radon-220-standard.php.

 


Category: Isotopes

Last update: 05.07.2020



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