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Isotopes of radon

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Summary

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There are 39 known isotopes of radon (86Rn), from 193Rn to 231Rn; all are radioactive. The most stable isotope is 222Rn with a half-life of 3.8215 days, which decays into .

Six isotopes of radon, 217-222Rn, occur in trace quantities in nature as decay products of, respectively, 217At, 218At, 223Ra, 224Ra, 225Ra, and 226Ra. 217Rn and 221Rn are produced in rare branches in the decay chain of trace quantities of 237Np; 222Rn (and also 218Rn in a rare branch) is an intermediate step in the decay chain of 238U; 219Rn is an intermediate step in the decay chain of 235U; and 220Rn occurs in the decay chain of 232Th.

List of isotopes

|-id=Radon-193 | 193Rn | | 193.009708(27) | 1.15(27) ms | α | 189Po | (3/2−) | |-id=Radon-194 | 194Rn | | 194.006146(18) | 780(160) μs | α | 190Po | 0+ | |-id=Radon-195 | 195Rn | | 195.005422(55) | 7(3) ms | α | 191Po | 3/2− | |-id=Radon-195m | | 6(3) ms | α | 191Po | 13/2+ | |-id=Radon-196 | 196Rn | | 196.002120(15) | 4.7(11) ms | α | 192Po | 0+ | |-id=Radon-197 | 197Rn | | 197.001621(17) | 54(6) ms | α | 193Po | 3/2− | |-id=Radon-197m | | 25.6(25) ms | α | 193Po | 13/2+ | |-id=Radon-198 | 198Rn | | 197.998679(14) | 64.4(16) ms | α | 194Po | 0+ | |-id=Radon-199 | 199Rn | | 198.9983254(78) | 590(30) ms | α | 195Po | 3/2− | |-id=Radon-199m | | 310(20) ms | α | 195Po | 13/2+ | |-id=Radon-200 | 200Rn | | 199.9957053(62) | 1.09(16) s | α | 196Po | 0+ | |-id=Radon-200m | | 28(9) μs | IT | 200Rn | | |-id=Radon-201 | 201Rn | | 200.995591(11) | 7.0(4) s | α | 197Po | 3/2− | |-id=Radon-201m | | 3.8(1) s | α | 197Po | 13/2+ | |-id=Radon-202 | α (78%)

198Po
β+ (22%)
202At
-id=Radon-202m

| | 2.22(7) μs | IT | 202Rn | 11−# | |-id=Radon-203 | α (66%)

199Po
β+ (34%)
203At
-id=Radon-203m
α (75%)
199Po
-
β+ (25%)
203At
-id=Radon-204
α (72.4%)
200Po
-
β+ (27.6%)
204At
-id=Radon-205
β+ (75.4%)
205At
-
α (24.6%)
201Po
-id=Radon-205m

| | 10 s | IT | 205Rn | 13/2+# | |-id=Radon-206 | α (62%)

202Po
β+ (38%)
206At
-id=Radon-207
β+ (79%)
207At
-
α (21%)
203Po
-id=Radon-207m

| | 184.5(9) μs | IT | 207Rn | 13/2+ | |-id=Radon-208 | α (62%)

204Po
β+ (38%)
208At
-id=Radon-208m

| | 487(12) ns | IT | 208Rn | 8+ | |-id=Radon-209 | β+ (83%)

209At
α (17%)
205Po
-id=Radon-209m1

| | 13.4(13) μs | IT | 209Rn | 13/2+ | |-id=Radon-209m2 | | 3.0(3) μs | IT | 209Rn | 35/2+ | |-id=Radon-210 | α (96%)

206Po
β+ (4%)
210At
-id=Radon-210m1

| | 644(40) ns | IT | 210Rn | 8+ | |-id=Radon-210m2 | | 1.06(5) μs | IT | 210Rn | 17− | |-id=Radon-210m3 | | 1.04(7) μs | IT | 210Rn | 23+ | |-id=Radon-211 | β+ (72.6%)

211At
α (27.4%)
207Po
-id=Radon-211m1

| | 596(28) ns | IT | 211Rn | 17/2− | |-id=Radon-211m2 | | 201(4) ns | IT | 211Rn | 63/2− | |-id=Radon-212 |212Rn | |211.9907039(33) |23.9(12) min | α | 208Po |0+ | |-id=Radon-212m1 | | 118(14) ns | IT | 212Rn | 6+ | |-id=Radon-212m2 | | 910(30) ns | IT | 212Rn | 8+ | |-id=Radon-212m3 | | 102(4) ns | IT | 212Rn | 22+ | |-id=Radon-212m4 | | 154(14) ns | IT | 212Rn | 30+ | |-id=Radon-213 | 213Rn | | 212.9938851(36) | 19.5(1) ms | α | 209Po | 9/2+# | |-id=Radon-213m1 | | 1.00(21) μs | IT | 213Rn | (25/2+) | |-id=Radon-213m2 | | 1.36(7) μs | IT | 213Rn | (31/2−) | |-id=Radon-213m3 | | 164(11) ns | IT | 213Rn | (55/2+) | |-id=Radon-214 |214Rn | |213.9953627(99) |259(3) ns | α | 210Po |0+ | |-id=Radon-214m | | 245(30) ns |IT |214Rn | (22+) | |-id=Radon-215 | 215Rn | | 214.9987450(65) | 2.30(10) μs | α | 211Po | 9/2+ | |-id=Radon-216 | 216Rn | | 216.0002719(62) | 29(4) μs | α | 212Po | 0+ | |-id=Radon-217 | 217Rn | | 217.0039276(45) | 593(38) μs | α | 213Po | 9/2+ | TraceIntermediate decay product of 237Np |-id=Radon-218 | 218Rn | | 218.0056011(25) | 33.75(15) ms | α | 214Po | 0+ | TraceIntermediate decay product of 238U |-id=Radon-219 | 219Rn | Actinon Actinium emanation | 219.0094787(23) | 3.96(1) s | α | 215Po | 5/2+ | TraceIntermediate decay product of 235U |-id=Radon-220 |220Rn |Thoron Thorium emanation | 220.0113924(19) |55.6(1) s | αTheoretically capable of β−β− decay to 220Ra | 216Po |0+ |TraceIntermediate decay product of 232Th |-id=Radon-221 | β− (78%)

221Fr
α (22%)
217Po
-
222RnMost common isotope
RadonSource of element's name
Radium emanation
Emanation
Emanon
Niton
222.0175760(21)
3.8215(2) d
α
218Po
0+
Trace
-id=Radon-223
β−
223Fr
-
α?
219Po
-id=Radon-224
224Rn

| | 224.024096(11) | 107(3) min | β− | 224Fr | 0+ | |-id=Radon-225 | 225Rn | | 225.028486(12) | 4.66(4) min | β− | 225Fr | 7/2− | |-id=Radon-226 | 226Rn | | 226.030861(11) | 7.4(1) min | β− | 226Fr | 0+ | |-id=Radon-227 | 227Rn | | 227.035304(15) | 20.2(4) s | β− | 227Fr | (3/2+) | |-id=Radon-228 | 228Rn | | 228.037835(19) | 65(2) s | β− | 228Fr | 0+ | |-id=Radon-229 | 229Rn | | 229.042257(14) | 11.9(13) s | β− | 229Fr | (5/2+) | |-id=Radon-230 | 230Rn | | 230.04527(22)# | 24# s [300 ns] | | | 0+ | |-id=Radon-231 | 231Rn | | 231.04997(32)# | 2# s [300 ns] | | | 1/2+# |

References

Isotope masses from:

    • Half-life, spin, and isomer data selected from the following sources.

    References

    1. "Adopted Levels for 213Rn". NNDC Chart of Nuclides.
    2. "Adopted Levels for 215Rn". NNDC Chart of Nuclides.
    3. (August 1973). "Beta-decay half-lives calculated on the gross theory". Atomic Data and Nuclear Data Tables.
    4. (2014). "Investigation of rare nuclear decays with BaF2 crystal scintillator contaminated by radium". European Physical Journal A.
    5. (2017-01-18). "Systematic study of α decay for odd-A nuclei within a two-potential approach". American Physical Society.
    6. "Adopted Levels for 223Rn". NNDC Chart of Nuclides.
    Wikipedia Source

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