Isotopes of thallium

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Template:Short description Template:Infobox thallium isotopes Thallium (81Tl) has 42 isotopes with atomic masses that range from 176 to 217. 203Tl and 205Tl are the only stable isotopes and 204Tl is the most stable radioisotope with a half-life of 3.78 years. 207Tl, with a half-life of 4.77 minutes, has the longest half-life of naturally occurring Tl radioisotopes. All isotopes of thallium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

Thallium-202 (half-life 12.23 days) can be made in a cyclotron[1] while thallium-204 (half-life 3.78 years) is made by the neutron activation of stable thallium in a nuclear reactor.[2]

In the fully ionized state, the isotope 205Tl81+ becomes beta-radioactive, undergoing bound-state β− decay to 205Pb81+ with a half-life of Template:Val days,[3][4] but 203Tl remains stable.

205Tl is the decay product of bismuth-209, an isotope that was once thought to be stable but is now known to undergo alpha decay with an extremely long half-life of 2.01×1019 y.[5] 205Tl is at the end of the neptunium series decay chain.

File:Decay Chain(4n+1, Neptunium Series).svg
The neptunium series decay chain, which ends at 205Tl.

List of isotopes

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Template:Isotopes table |-id=Thallium-176 | rowspan=2|176Tl[6] | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 95 | rowspan=2|176.000628(89) | rowspan=2|Template:Val | p (50%) | 175Hg | rowspan=2|(3−,4−) | rowspan=2| | rowspan=2| |- | α (50%) | 172Au |-id=Thallium-176m | rowspan=2 style="text-indent:1em" | 176mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 671 keV | rowspan=2|Template:Val | p (50%) | 175Hg | rowspan=2| | rowspan=2| | rowspan=2| |- | α (50%) | 172mAu |-id=Thallium-177 | rowspan=2|177Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 96 | rowspan=2|176.996414(23) | rowspan=2|18(5) ms | α (73%) | 173Au | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | p (27%) | 176Hg |-id=Thallium-177m | rowspan=2 style="text-indent:1em" | 177mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 807(18) keV | rowspan=2|230(40) μs | p (51%) | 176Hg | rowspan=2|(11/2−) | rowspan=2| | rowspan=2| |- | α (49%) | 173Au |-id=Thallium-178 | rowspan=3|178Tl | rowspan=3| | rowspan=3 style="text-align:right" | 81 | rowspan=3 style="text-align:right" | 97 | rowspan=3|177.99505(11)# | rowspan=3|255(9) ms | α (62%) | 174Au | rowspan=3| (4-,5-) | rowspan=3| | rowspan=3| |- | β+ (38%) | 178Hg |- | β+, SF (0.15%) | (various) |-id=Thallium-179 | rowspan=2|179Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 98 | rowspan=2|178.991122(41) | rowspan=2|437(9) ms | α (60%) | 175Au | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | β+ (40%) | 179Hg |-id=Thallium-179m1 | style="text-indent:1em" | 179m1Tl | | colspan="3" style="text-indent:2em" | 825(10)# keV | 1.41(2) ms | α | 175Au | (11/2−) | | |-id=Thallium-179m2 | style="text-indent:1em" | 179m2Tl | | colspan="3" style="text-indent:2em" | 904.5(9) keV | 119(14) ns | IT | 179Tl | (9/2−) | | |-id=Thallium-180 | rowspan=3|180Tl | rowspan=3| | rowspan=3 style="text-align:right" | 81 | rowspan=3 style="text-align:right" | 99 | rowspan=3|179.989919(75) | rowspan=3|1.09(1) s | β+ (93%) | 180Hg | rowspan=3|(4-) | rowspan=3| | rowspan=3| |- | α (7%) | 176Au |- | β+, SF (0.0032%) | 100Ru, 80Kr[7] |-id=Thallium-181 | rowspan=2|181Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 100 | rowspan=2|180.9862600(98) | rowspan=2|2.9(1) s | β+ (91.4%) | 181Hg | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | α (8.6%) | 177Au |-id=Thallium-181m | rowspan=2 style="text-indent:1em" | 181mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 835.9(4) keV | rowspan=2|1.40(3) ms | IT (99.60%) | 181Tl | rowspan=2|(9/2−) | rowspan=2| | rowspan=2| |- | α (0.40%) | 177Au |-id=Thallium-182 | rowspan=3|182Tl | rowspan=3| | rowspan=3 style="text-align:right" | 81 | rowspan=3 style="text-align:right" | 101 | rowspan=3|181.985693(13) | rowspan=3|1.9(1) s | β+ (<99.41%) | 182Hg | rowspan=3|(4−) | rowspan=3| | rowspan=3| |- | α (>0.49%) | 178Au |- | β+, SF (<3.4Template:E%) | 182Hg |-id=Thallium-182m | rowspan=2 style="text-indent:1em" | 182mTl[n 1] | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 50(50)# keV | rowspan=2|3.1(10) s | β+ (97.5%) | 182Hg | rowspan=2|(7+) | rowspan=2| | rowspan=2| |- | α (2.5%) | 178Au |-id=Thallium-183 | rowspan=2|183Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 102 | rowspan=2|182.982193(10) | rowspan=2|6.9(7) s | β+ (?%) | 183Hg | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | α (?%) | 179Au |-id=Thallium-183m1 | rowspan=3 style="text-indent:1em" | 183m1Tl | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | 628.7(5) keV | rowspan=3|53.3(3) ms | IT (?%) | 183Tl | rowspan=3|(9/2−) | rowspan=3| | rowspan=3| |- | α (1.5%) | 179Au |- | β+ (?%) | 183Hg |-id=Thallium-183m2 | style="text-indent:1em" | 183m2Tl | | colspan="3" style="text-indent:2em" | 975.3(6) keV | 1.48(10) μs | IT | 183Tl | (13/2+) | | |-id=Thallium-184 | rowspan=2|184Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 103 | rowspan=2|183.981875(11) | rowspan=2|9.5(2) s | β+ (98.78%) | 184Hg | rowspan=2|2− | rowspan=2| | rowspan=2| |- | α (1.22%) | 180Au |-id=Thallium-184m1 | rowspan=2 style="text-indent:1em" | 184m1Tl[n 1] | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | −50(30) keV | rowspan=2|10.6(5) s | β+ (99.53%) | 184Hg | rowspan=2|(7+) | rowspan=2| | rowspan=2| |- | α (0.47%) | 180Au |-id=Thallium-184m2 | rowspan=2 style="text-indent:1em" | 184m2Tl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 450(30) keV | rowspan=2| 47.1(7) ms | IT (99.91%) | | rowspan=2|(10−) | rowspan=2| | rowspan=2| |- | α (0.089%) | 180Au |-id=Thallium-185 | 185Tl | | style="text-align:right" | 81 | style="text-align:right" | 104 | 184.978789(22) | 19.5(5) s | β+ | 185Hg | 1/2+ | | |- |-id=Thallium-185m | rowspan=2 style="text-indent:1em" | 185mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 454.8(15) keV | rowspan=2|1.93(8) s | IT | 185Tl | rowspan=2|9/2− | rowspan=2| | rowspan=2| |- | α (?%) | 181Au |-id=Thallium-186 | rowspan=2|186Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 105 | rowspan=2|185.978655(22) | rowspan=2|3.5(5) s | β+ (?%) | 186Hg | rowspan=2|(2−) | rowspan=2| | rowspan=2| |- | α (?%) | 182Au |-id=Thallium-186m1 | rowspan=2 style="text-indent:1em" | 186m1Tl[n 1] | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 20(40) keV | rowspan=2|27.5(10) s | β+ (99.99%) | 186Hg | rowspan=2|7+ | rowspan=2| | rowspan=2| |- | α (0.006%) | 182Au |-id=Thallium-186m2 | rowspan=2 style="text-indent:1em" | 186m2Tl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 390(40) keV | rowspan=2|3.40(9) s | IT (<94.1%) | 186Tl | rowspan=2|10− | rowspan=2| | rowspan=2| |- | β+ (>5.9%) | 186Hg |-id=Thallium-187 | 187Tl | | style="text-align:right" | 81 | style="text-align:right" | 106 | 186.9759047(86) | ~51 s | β+ | 187Hg | 1/2+ | | |-id=Thallium-187m1 | rowspan=3 style="text-indent:1em" | 187m1Tl | rowspan=3| | rowspan=3 colspan="3" style="text-indent:2em" | 334(3) keV | rowspan=3|15.60(12) s | β+ (?%) | 187Hg | rowspan=3|9/2− | rowspan=3| | rowspan=3| |- | IT (?%) | 187Tl |- | α (0.15%) | 183Au |-id=Thallium-187m2 | style="text-indent:1em" | 187m2Tl | | colspan="3" style="text-indent:2em" | 1875(50)# keV | 1.11(7) μs | IT | 187Tl | | | |-id=Thallium-187m3 | style="text-indent:1em" | 187m3Tl | | colspan="3" style="text-indent:2em" | 2582.5(3) keV | 693(38) ns | IT | 187Tl | 29/2+# | | |-id=Thallium-188 | 188Tl | | style="text-align:right" | 81 | style="text-align:right" | 107 | 187.976021(32) | 71(2) s | β+ | 188Hg | 2−# | | |-id=Thallium-188m1 | style="text-indent:1em" | 188m1Tl[n 1] | | colspan="3" style="text-indent:2em" | 30(30) keV | 71.5(15) s | β+ | 188Hg | 7+ | | |-id=Thallium-188m2 | style="text-indent:1em" | 188m2Tl | | colspan="3" style="text-indent:2em" | 299(30) keV | 41(4) ms | IT | 188Tl | 9− | | |-id=Thallium-189 | 189Tl | | style="text-align:right" | 81 | style="text-align:right" | 108 | 188.9735735(90) | 2.3(2) min | β+ | 189Hg | 1/2+ | | |-id=Thallium-189m | style="text-indent:1em" | 189mTl | | colspan="3" style="text-indent:2em" | 285(6) keV | 1.4(1) min | β+ | 189Hg | 9/2− | | |-id=Thallium-190 | 190Tl | | style="text-align:right" | 81 | style="text-align:right" | 109 | 189.9738418(78) | 2.6(3) min | β+ | 190Hg | 2− | | |-id=Thallium-190m1 | style="text-indent:1em" | 190m1Tl | | colspan="3" style="text-indent:2em" | 70(7) keV | 3.6(3) min | β+ | 190Hg | 7+ | | |-id=Thallium-190m2 | style="text-indent:1em" | 190m2Tl | | colspan="3" style="text-indent:2em" | 306(10) keV | 60# ms | IT | 190Tl | (9−) | | |-id=Thallium-191 | 191Tl | | style="text-align:right" | 81 | style="text-align:right" | 110 | 190.9717841(79) | 20# min | β+ | 191Hg | 1/2+ | | |-id=Thallium-191m | style="text-indent:1em" | 191mTl | | colspan="3" style="text-indent:2em" | 297(7) keV | 5.22(16) min | β+ | 191Hg | 9/2− | | |-id=Thallium-192 | 192Tl | | style="text-align:right" | 81 | style="text-align:right" | 111 | 191.972225(34) | 9.6(4) min | β+ | 192Hg | 2− | | |-id=Thallium-192m1 | style="text-indent:1em" | 192m1Tl | | colspan="3" style="text-indent:2em" | 196(7) keV | 10.8(2) min | β+ | 192Hg | 7+ | | |-id=Thallium-192m2 | style="text-indent:1em" | 192m2Tl | | colspan="3" style="text-indent:2em" | 447(7) keV | 296(5) ns | IT | 192Tl | (8−) | | |-id=Thallium-192m3 | style="text-indent:1em" | 192m3Tl | | colspan="3" style="text-indent:2em" | 180(40) keV | | α | 188Au | (3+) | | |-id=Thallium-193 | 193Tl | | style="text-align:right" | 81 | style="text-align:right" | 112 | 192.9705020(72) | 21.6(8) min | β+ | 193Hg | 1/2+ | | |-id=Thallium-193m | rowspan=2 style="text-indent:1em" | 193mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 372(4) keV | rowspan=2|2.11(15) min | IT (~75%) | 193Tl | rowspan=2|9/2− | rowspan=2| | rowspan=2| |- | β+ (~25%) | 193Hg |-id=Thallium-194 | 194Tl | | style="text-align:right" | 81 | style="text-align:right" | 113 | 193.971081(15) | 33.0(5) min | β+ | 194Hg | 2− | | |-id=Thallium-194m | style="text-indent:1em" | 194mTl | | colspan="3" style="text-indent:2em" | 260(14) keV | 32.8(2) min | β+ | 194Hg | 7+ | | |-id=Thallium-195 | 195Tl | | style="text-align:right" | 81 | style="text-align:right" | 114 | 194.969774(12) | 1.16(5) h | β+ | 195Hg | 1/2+ | | |-id=Thallium-195m | style="text-indent:1em" | 195mTl | | colspan="3" style="text-indent:2em" | 482.63(17) keV | 3.6(4) s | IT | 195Tl | 9/2− | | |-id=Thallium-196 | 196Tl | | style="text-align:right" | 81 | style="text-align:right" | 115 | 195.970481(13) | 1.84(3) h | β+ | 196Hg | 2− | | |-id=Thallium-196m | rowspan=2 style="text-indent:1em" | 196mTl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 394.2(5) keV | rowspan=2|1.41(2) h | β+ (96.2%) | 196Hg | rowspan=2|7+ | rowspan=2| | rowspan=2| |- | IT (3.8%) | 196Tl |-id=Thallium-197 | 197Tl | | style="text-align:right" | 81 | style="text-align:right" | 116 | 196.969560(15) | 2.84(4) h | β+ | 197Hg | 1/2+ | | |-id=Thallium-197m | style="text-indent:1em" | 197mTl | | colspan="3" style="text-indent:2em" | 608.22(8) keV | 540(10) ms | IT | 197Tl | 9/2− | | |-id=Thallium-198 | 198Tl | | style="text-align:right" | 81 | style="text-align:right" | 117 | 197.9704467(81) | 5.3(5) h | β+ | 198Hg | 2− | | |-id=Thallium-198m1 | rowspan=2 style="text-indent:1em" | 198m1Tl | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 543.6(4) keV | rowspan=2|1.87(3) h | β+ (55.9%) | 198Hg | rowspan=2|7+ | rowspan=2| | rowspan=2| |- | IT (44.1%) | 198Tl |-id=Thallium-198m2 | style="text-indent:1em" | 198m2Tl | | colspan="3" style="text-indent:2em" | 686.8(5) keV | 150(40) ns | IT | 198Tl | (5)+ | | |-id=Thallium-198m3 | style="text-indent:1em" | 198m3Tl | | colspan="3" style="text-indent:2em" | 742.4(4) keV | 32.1(10) ms | IT | 198Tl | 10− | | |-id=Thallium-199 | 199Tl | | style="text-align:right" | 81 | style="text-align:right" | 118 | 198.969877(30) | 7.42(8) h | β+ | 199Hg | 1/2+ | | |-id=Thallium-199m | style="text-indent:1em" | 199mTl | | colspan="3" style="text-indent:2em" | 748.87(6) keV | 28.4(2) ms | IT | 199Tl | 9/2− | | |-id=Thallium-200 | 200Tl | | style="text-align:right" | 81 | style="text-align:right" | 119 | 199.9709636(62) | 26.1(1) h | β+ | 200Hg | 2− | | |-id=Thallium-200m1 | style="text-indent:1em" | 200m1Tl | | colspan="3" style="text-indent:2em" | 753.60(24) keV | 34.0(9) ms | IT | 200Tl | 7+ | | |-id=Thallium-200m2 | style="text-indent:1em" | 200m2Tl | | colspan="3" style="text-indent:2em" | 762.00(24) keV | 397(17) ns | IT | 200Tl | 5+ | | |- | 201Tl[n 2] | | style="text-align:right" | 81 | style="text-align:right" | 120 | 200.970820(15) | 3.0421(8) d | EC | 201Hg | 1/2+ | | |-id=Thallium-201m | style="text-indent:1em" | 201mTl | | colspan="3" style="text-indent:2em" | 919.16(21) keV | 2.01(7) ms | IT | 201Tl | 9/2− | | |-id=Thallium-202 | 202Tl | | style="text-align:right" | 81 | style="text-align:right" | 121 | 201.9721089(20) | 12.31(8) d | EC | 202Hg | 2− | | |-id=Thallium-202m | style="text-indent:1em" | 202mTl | | colspan="3" style="text-indent:2em" | 950.19(10) keV | 591(3) μs | IT | 202Tl | 7+ | | |-id=Thallium-203 | 203Tl | | style="text-align:right" | 81 | style="text-align:right" | 122 | 202.9723441(13) | colspan=3 align=center|Observationally Stable[n 3] | 1/2+ | 0.29515(44) | |-id=Thallium-203m1 | style="text-indent:1em" | 203m1Tl | | colspan="3" style="text-indent:2em" | 1483.7(9) keV | <1 μs | IT | 203Tl | (9/2−) | | |-id=Thallium-203m2 | style="text-indent:1em" | 203m2Tl | | colspan="3" style="text-indent:2em" | 3565(50)# keV | 7.7(5) μs | IT | 203Tl | (25/2+) | | |-id=Thallium-204 | rowspan=2|204Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 123 | rowspan=2|203.9738634(12) | rowspan=2|3.783(12) y | β− (97.08%) | 204Pb | rowspan=2|2− | rowspan=2| | rowspan=2| |- | EC (2.92%) | 204Hg |-id=Thallium-204m1 | style="text-indent:1em" | 204m1Tl | | colspan="3" style="text-indent:2em" | 1104.1(2) keV | 61.7(10) μs | IT | 204Tl | 7+ | | |-id=Thallium-204m2 | style="text-indent:1em" | 204m2Tl | | colspan="3" style="text-indent:2em" | 2319.0(3) keV | 2.6(2) μs | IT | 204Tl | 12− | | |-id=Thallium-204m3 | style="text-indent:1em" | 204m3Tl | | colspan="3" style="text-indent:2em" | 4391.6(5) keV | 420(30) ns | IT | 204Tl | 18+ | | |-id=Thallium-204m4 | style="text-indent:1em" | 204m4Tl | | colspan="3" style="text-indent:2em" | 6239.4(5) keV | 90(3) ns | IT | 204Tl | 22− | | |-id=Thallium-205 | 205Tl[n 4] | | style="text-align:right" | 81 | style="text-align:right" | 124 | 204.9744273(13) | colspan=3 align=center|Observationally Stable[n 5]Template:Refn | 1/2+ | 0.70485(44) | |-id=Thallium-205m1 | style="text-indent:1em" | 205m1Tl | | colspan="3" style="text-indent:2em" | 3290.61(17) keV | 2.6(2) μs | IT | 205Tl | 25/2+ | | |-id=Thallium-205m2 | style="text-indent:1em" | 205m2Tl | | colspan="3" style="text-indent:2em" | 4835.6(15) keV | 235(10) ns | IT | 205Tl | (35/2–) | | |-id=Thallium-206 | 206Tl | Radium E" | style="text-align:right" | 81 | style="text-align:right" | 125 | 205.9761101(14) | 4.202(11) min | β− | 206Pb | 0− | Trace[n 6] | |-id=Thallium-206m | style="text-indent:1em" | 206mTl | | colspan="3" style="text-indent:2em" | 2643.10(18) keV | 3.74(3) min | IT | 206Tl | (12)– | | |-id=Thallium-207 | 207Tl | Actinium C" | style="text-align:right" | 81 | style="text-align:right" | 126 | 206.9774186(58) | 4.77(2) min | β− | 207Pb | 1/2+ | Trace[n 7] | |-id=Thallium-207m | style="text-indent:1em" | 207mTl | | colspan="3" style="text-indent:2em" | 1348.18(16) keV | 1.33(11) s | IT | 207Tl | 11/2– | | |-id=Thallium-208 | 208Tl | Thorium C" | style="text-align:right" | 81 | style="text-align:right" | 127 | 207.9820180(20) | 3.053(4) min | β− | 208Pb | 5+ | Trace[n 8] | |-id=Thallium-208m | style="text-indent:1em" | 208mTl | | colspan="3" style="text-indent:2em" | 1807(1) keV | 1.3(1) μs | IT | 208Tl | (0–) | | |-id=Thallium-209 | 209Tl | | style="text-align:right" | 81 | style="text-align:right" | 128 | 208.9853517(66) | 2.162(7) min | β− | 209Pb | 1/2+ | Trace[n 9] | |-id=Thallium-209m | style="text-indent:1em" | 209mTl | | colspan="3" style="text-indent:2em" | 1228.1(20) keV | 146(10) ns | IT | 209Tl | 17/2+ | | |-id=Thallium-210 | rowspan=2|210Tl | rowspan=2|Radium C″ | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 129 | rowspan=2|209.990073(12) | rowspan=2|1.30(3) min | β− (99.99%) | 210Pb | rowspan=2|5+# | rowspan=2| Trace[n 6] | rowspan=2| |- | β−, n (0.009%) | 209Pb |-id=Thallium-210m | style="text-indent:1em" | 210mTl | | colspan="3" style="text-indent:2em" | 1200(200)# keV | 1# min
[>3 μs] | | | (9+,10+) | | |-id=Thallium-211 | rowspan=2|211Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 130 | rowspan=2|210.993475(45) | rowspan=2|81(16) s | β− (97.8%) | 211Pb | rowspan=2|1/2+ | rowspan=2| | rowspan=2| |- | β−, n (2.2%) | 210Pb |-id=Thallium-211m | style="text-indent:1em" | 211mTl | | colspan="3" style="text-indent:2em" | 1244(100)# keV | 580(80) ns | IT | 211Tl | 17/2+# | | |-id=Thallium-212 | rowspan=2|212Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 131 | rowspan=2|211.99834(22)# | rowspan=2|31(8) s | β− (98.2%) | 212Pb | rowspan=2|(5+) | rowspan=2| | rowspan=2| |- | β−, n (1.8%) | 211Pb |-id=Thallium-213 | rowspan=2|213Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 132 | rowspan=2|213.001915(29) | rowspan=2|23.8(44) s | β− (92.4%) | 213Pb | rowspan=2|1/2+# | rowspan=2| | rowspan=2| |- | β−, n (7.6%) | 212Pb |-id=Thallium-213m1 | style="text-indent:1em" | 213m1Tl | | colspan="3" style="text-indent:2em" | 680(300)# keV | 4.1(5) μs | IT | 213Tl | | | |-id=Thallium-213m2 | style="text-indent:1em" | 213m2Tl | | colspan="3" style="text-indent:2em" | 1250(100)# keV | 0.6(3) μs | IT | 213Tl | 17/2+# | | |-id=Thallium-214 | rowspan=2|214Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 133 | rowspan=2|214.00694(21)# | rowspan=2|11.0(24) s | β− (66%) | 214Pb | rowspan=2|5+# | rowspan=2| | rowspan=2| |- | β−, n (34%) | 213Pb |-id=Thallium-215 | rowspan=2|215Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 134 | rowspan=2|215.01077(32)# | rowspan=2|9.7(38) s | β− (95.4%) | 215Pb | rowspan=2|1/2+# | rowspan=2| | rowspan=2| |- | β−, n (4.6%) | 214Pb |-id=Thallium-216 | rowspan=2|216Tl | rowspan=2| | rowspan=2 style="text-align:right" | 81 | rowspan=2 style="text-align:right" | 135 | rowspan=2|216.01596(32)# | rowspan=2|5.9(33) s | β− (>88.5%) | 216Pb | rowspan=2|5+# | rowspan=2| | rowspan=2| |- | β−, n (<11.5%) | 215Pb |-id=Thallium-217 | 217Tl | | style="text-align:right" | 81 | style="text-align:right" | 136 | 217.02003(43)# | 2# s
[>300 ns] | | | 1/2+# | | Template:Isotopes table/footer

Thallium-201

Thallium-201 (201Tl) is a synthetic radioisotope of thallium. It has a half-life of 73 hours and decays by electron capture, emitting X-rays (~70–80 keV), and photons of 135 and 167 keV in 10% total abundance.[8] Thallium-201 is synthesized by the neutron activation of stable thallium in a nuclear reactor,[8][9] or by the 203Tl(p, 3n)201Pb nuclear reaction in cyclotrons, as 201Pb naturally decays to 201Tl afterwards.[10] It is a radiopharmaceutical, as it has good imaging characteristics without excessive patient radiation dose. It is the most popular isotope used for thallium nuclear cardiac stress tests.[11]

See also

Daughter products other than thallium

References

Template:Reflist

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  2. ↑ Manual for reactor produced radioisotopes from the International Atomic Energy Agency
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  8. ↑ a b Template:NUBASE 2003
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