Природно настанатиот тулиум (69Tm) е составен од еден стабилен изотоп, 169Tm (100% природна застапеност). Определени се 39 радиоизотопи, од кои најстабилни се 171Tm со време на полураспад од 1,92 години, 170Tm со време на полураспад од 128,6 дена, 168Tm со време на полураспад од 93,1 ден и 167Tm со време на полураспад од 9,25 дена. Сите преостанати радиоактивни изотопи имаат време на полураспад помало од 64 часа, а повеќето од нив имаат време на полураспад помало од 2 минути. Овој елемент има и 26 метасостојби, со најстабилни 164mTm (t1/2 5,1 минути), 160mTm (t1/2 74,5 секунди) и 155mTm (t1/2 45 секунди).
Познатите изотопи на тулиумот се движат од 144Tm до 183Tm. Примарниот режим на распаѓање пред најзастапениот стабилен изотоп, 169Tm, е електронски зафат, а примарниот режим после е бета-емисија. Примарните распадни производи пред 169Tm се изотопи на ербиумот, а примарните производи потоа се изотопи на итербиумот. Сите изотопи на тулиумот се или радиоактивни или, во случај на 169Tm, набљудувачки стабилни, што значи дека се предвидува дека 169Tm е радиоактивен, но не е забележан вистински распад.
Список на изотопите
|-id=Тулиум-144 | 144Tm | style="text-align:right" | 69 | style="text-align:right" | 75 | 143,97621(43)# | 2,3(9) μс | p | 143Er | (10+) | |-id=Тулиум-145 | 145Tm | style="text-align:right" | 69 | style="text-align:right" | 76 | 144,97039(21)# | 3,17(20) μс | p | 144Er | (11/2−) | |-id=Тулиум-146 | 146Tm | style="text-align:right" | 69 | style="text-align:right" | 77 | 145,96666(22)# | 155(20) мс | p | 145Er | (1+) | |-id=Тулиум-146m1 | style="text-indent:1em" | 146m1Tm | colspan="3" style="text-indent:2em" | 304(6) keV | 73(7) мс | p | 145Er | (5−) | |-id=Тулиум-146m2 | style="text-indent:1em" | 146m2Tm | colspan="3" style="text-indent:2em" | 437(7) keV | 200(3) мс | p | 145Er | (10+) | |-id=Тулиум-147 | rowspan=2|147Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 78 | rowspan=2|146,9613799(73) | rowspan=2|0,58(3) с | β+ (85%) | 147Er | rowspan=2|11/2− | rowspan=2| |- | p (15%) | 146Er |-id=Тулиум-147m | style="text-indent:1em" | 147mTm | colspan="3" style="text-indent:2em" | 62(5) keV | 360(40) μс | p | 146Er | 3/2+ | |-id=Тулиум-148 | 148Tm | style="text-align:right" | 69 | style="text-align:right" | 79 | 147,958384(11) | 0,7(2) с | β+ | 148Er | (10+) | |-id=Тулиум-149 | rowspan=2|149Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 80 | rowspan=2|148,95283(22)# | rowspan=2|0,9(2) с | β+ (99,74%) | 149Er | rowspan=2|11/2− | rowspan=2| |- | β+, p (0,26%) | 148Ho |-id=Тулиум-150 | 150Tm | style="text-align:right" | 69 | style="text-align:right" | 81 | 149,95009(21)# | 3# с | β+ | 150Er | (1+) | |-id=Тулиум-150m1 | rowspan=2 style="text-indent:1em" | 150m1TmРедоследот на основната состојба и на изомерот не е извесен. | rowspan=2 colspan="3" style="text-indent:2em" | 140(140)# keV | rowspan=2|2,20(6) с | β+ (98,9%) | 150Er | rowspan=2|(6−) | rowspan=2| |- | β+, p (1,1%) | 149Ho |-id=Тулиум-150m2 | style="text-indent:1em" | 150m2Tm | colspan="3" style="text-indent:2em" | 811(140)# keV | 5,2(3) мс | IT | 150m1Tm | 10+# | |-id=Тулиум-151 | 151Tm | style="text-align:right" | 69 | style="text-align:right" | 82 | 150,945494(21) | 4,17(11) с | β+ | 151Er | (11/2−) | |-id=Тулиум-151m1 | style="text-indent:1em" | 151m1Tm | colspan="3" style="text-indent:2em" | 93(6) keV | 6,6(20) с | β+ | 151Er | (1/2+) | |-id=Тулиум-151m2 | style="text-indent:1em" | 151m2Tm | colspan="3" style="text-indent:2em" | 2655,67(22) keV | 451(34) нс | IT | 151Tm | (27/2−) | |-id=Тулиум-152 | 152Tm | style="text-align:right" | 69 | style="text-align:right" | 83 | 151,944476(58) | 8,0(10) с | β+ | 152Er | (2)− | |-id=Тулиум-152m1 | style="text-indent:1em" | 152m1Tm | colspan="3" style="text-indent:2em" | −100(250) keV | 5,2(6) с | β+ | 152Er | (9)+ | |-id=Тулиум-152m2 | style="text-indent:1em" | 152m2Tm | colspan="3" style="text-indent:2em" | 2455(250) keV | 301(7) нс | IT | 152Tm | (17+) | |-id=Тулиум-153 | rowspan=2|153Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 84 | rowspan=2|152,942058(13) | rowspan=2|1,48(1) с | α (91%) | 149Ho | rowspan=2|(11/2−) | rowspan=2| |- | β+ (9%) | 153Er |-id=Тулиум-153m | rowspan=2 style="text-indent:1em" | 153mTm | rowspan=2 colspan="3" style="text-indent:2em" | 43,2(2) keV | rowspan=2|2,5(2) с | α (92%) | 149Ho | rowspan=2|(1/2+) | rowspan=2| |- | β+ (8%) | 153Er |-id=Тулиум-154 | rowspan=2|154Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 85 | rowspan=2|153,941570(15) | rowspan=2|8,1(3) с | β+ (54%) | 154Er | rowspan=2|(2)− | rowspan=2| |- | α (46%) | 150Ho |-id=Тулиум-154m | rowspan=2 style="text-indent:1em" | 154mTm | rowspan=2 colspan="3" style="text-indent:2em" | 70(50) keV | rowspan=2|3,30(7) с | α (58%) | 150Ho | rowspan=2|(9)+ | rowspan=2| |- | β+ (42%) | 154Er |-id=Тулиум-155 | rowspan=2|155Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 86 | rowspan=2|154,939210(11) | rowspan=2|21,6(2) с | β+ (99,17%) | 155Er | rowspan=2|11/2− | rowspan=2| |- | α (0,83%) | 151Ho |-id=Тулиум-155m | style="text-indent:1em" | 155mTm | colspan="3" style="text-indent:2em" | 41(6) keV | 45(4) с | β+ | 155Er | 1/2+ | |-id=Тулиум-156 | rowspan=2|156Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 87 | rowspan=2|155,938986(15) | rowspan=2|83,8(18) с | β+ (99,94%) | 156Er | rowspan=2|2− | rowspan=2| |- | α (0,064%) | 152Er |-id=Тулиум-156m | style="text-indent:1em" | 156mTm | colspan="3" style="text-indent:2em" | 400(200)# keV | ~400 нс | IT | 156Tm | (11−) | |-id=Тулиум-157 | rowspan=2|157Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 88 | rowspan=2|156,936973(30) | rowspan=2|3,63(9) min | β+ | 157Er | rowspan=2|1/2+ | rowspan=2| |- | α (7,5%) | 153Er |-id=Тулиум-157m | style="text-indent:1em" | 157mTm | colspan="3" style="text-indent:2em" | 100(50)# keV | 1,6 с
| 7/2−# | |-id=Тулиум-158 | 158Tm | style="text-align:right" | 69 | style="text-align:right" | 89 | 157,936980(27) | 3,98(6) min | β+ | 158Er | 2− | |-id=Тулиум-158m | style="text-indent:1em" | 158mTm | colspan="3" style="text-indent:2em" | 100(50)# keV | ~20 с
| 5−# | |-id=Тулиум-159 | 159Tm | style="text-align:right" | 69 | style="text-align:right" | 90 | 158,934975(30) | 9,13(16) min | β+ | 159Er | 5/2+ | |-id=Тулиум-160 | 160Tm | style="text-align:right" | 69 | style="text-align:right" | 91 | 159,935264(35) | 9,4(3) min | β+ | 160Er | 1− | |-id=Тулиум-160m1 | rowspan=2 style="text-indent:1em" | 160m1Tm | rowspan=2 colspan="3" style="text-indent:2em" | 67(14) keV | rowspan=2|74,5(15) с | IT (85%) | 160Tm | rowspan=2|(5+) | rowspan=2| |- | β+ (15%) | 160Er |-id=Тулиум-160m2 | style="text-indent:1em" | 160m2Tm | colspan="3" style="text-indent:2em" | 215(52)# keV | ~200 нс | IT | 160Tm | (8) | |-id=Тулиум-161 | 161Tm | style="text-align:right" | 69 | style="text-align:right" | 92 | 160,933549(30) | 30,2(8) min | β+ | 161Er | 7/2+ | |-id=Тулиум-161m1 | style="text-indent:1em" | 161m1Tm | colspan="3" style="text-indent:2em" | 7,51(24) keV | 5# min
| (1/2+) | |-id=Тулиум-161m2 | style="text-indent:1em" | 161m2Tm | colspan="3" style="text-indent:2em" | 78,20(3) keV | 110(3) нс | IT | 161Tm | 7/2− | |-id=Тулиум-162 | 162Tm | style="text-align:right" | 69 | style="text-align:right" | 93 | 161,934001(28) | 21,70(19) min | β+ | 162Er | 1− | |-id=Тулиум-162m | rowspan=2 style="text-indent:1em" | 162mTm | rowspan=2 colspan="3" style="text-indent:2em" | 130(40) keV | rowspan=2|24,3(17) с | IT (81%) | 162Tm | rowspan=2|5+ | rowspan=2| |- | β+ (19%) | 162Er |-id=Тулиум-163 | 163Tm | style="text-align:right" | 69 | style="text-align:right" | 94 | 162,9326583(59) | 1,810(5) h | β+ | 163Er | 1/2+ | |-id=Тулиум-163m | style="text-indent:1em" | 163mTm | colspan="3" style="text-indent:2em" | 86,92(5) keV | 380(30) нс | IT | 163Tm | (7/2)− | |-id=Тулиум-164 | rowspan=2|164Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 95 | rowspan=2|163,933538(27) | rowspan=2|2,0(1) min | EC (61%) | rowspan=2|164Er | rowspan=2|1+ | rowspan=2| |- | β+ (39%) |-id=Тулиум-164m | rowspan=2 style="text-indent:1em" | 164mTm | rowspan=2 colspan="3" style="text-indent:2em" | 20(12) keV | rowspan=2|5,1(1) min | IT (~80%) | 164Tm | rowspan=2|6− | rowspan=2| |- | β+ (~20%) | 164Er |-id=Тулиум-165 | 165Tm | style="text-align:right" | 69 | style="text-align:right" | 96 | 164,9324418(18) | 30,06(3) h | β+ | 165Er | 1/2+ | |-id=Тулиум-165m1 | style="text-indent:1em" | 165m1Tm | colspan="3" style="text-indent:2em" | 80,37(6) keV | 80(3) μс | IT | 165Tm | 7/2+ | |-id=Тулиум-165m2 | style="text-indent:1em" | 165m2Tm | colspan="3" style="text-indent:2em" | 160,47(6) keV | 9,0(5) μс | IT | 165Tm | 7/2− | |-id=Тулиум-166 | 166Tm | style="text-align:right" | 69 | style="text-align:right" | 97 | 165,933562(12) | 7,70(3) h | β+ | 166Er | 2+ | |-id=Тулиум-166m1 | style="text-indent:1em" | 166m1Tm | colspan="3" style="text-indent:2em" | 122(7) keV | 348(21) мс | IT | 166Tm | (6−) | |-id=Тулиум-166m2 | style="text-indent:1em" | 166m2Tm | colspan="3" style="text-indent:2em" | 244(7) keV | 2(1) μс | IT | 166Tm | (6−) | |-id=Тулиум-167 | 167Tm | style="text-align:right" | 69 | style="text-align:right" | 98 | 166,9328572(14) | 9,25(2) d | EC | 167Er | 1/2+ | |-id=Тулиум-167m1 | style="text-indent:1em" | 167m1Tm | colspan="3" style="text-indent:2em" | 179,480(19) keV | 1,16(6) μс | IT | 167Tm | 7/2+ | |-id=Тулиум-167m2 | style="text-indent:1em" | 167m2Tm | colspan="3" style="text-indent:2em" | 292,820(20) keV | 0,9(1) μс | IT | 167Tm | 7/2− | |-id=Тулиум-168 | rowspan=2|168Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 99 | rowspan=2|167,9341785(18) | rowspan=2|93,1(2) d | β+ (99,99%) | 168Er | rowspan=2|3+ | rowspan=2| |- | β− (0,010%) | 168Yb |-id=Тулиум-169 | 169Tm | style="text-align:right" | 69 | style="text-align:right" | 100 | 168,93421896(79) | colspan=3 align=center|Опсервациски стабиленСе верува дека подлежи на α-распад до 165Ho | 1/2+ | 1,0000 |-id=Тулиум-169m | style="text-indent:1em" | 169mTm | colspan="3" style="text-indent:2em" | 316,1463(1) keV | 659,9(23) нс | IT | 169Tm | 7/2+
| rowspan=2|170Tm | rowspan=2 style="text-align:right" | 69 | rowspan=2 style="text-align:right" | 101 | rowspan=2|169,93580709(79) | rowspan=2|128,6(3) d | β− (99,87%) | 170Yb | rowspan=2|1− | rowspan=2| |- | EC (0,131%) | 170Er |-id=Тулиум-170m | style="text-indent:1em" | 170mTm | colspan="3" style="text-indent:2em" | 183,197(4) keV | 4,12(13) μс | IT | 170Tm | 3+ | |-id=Тулиум-171 | 171Tm | style="text-align:right" | 69 | style="text-align:right" | 102 | 170,9364352(10) | 1,92(1) y | β− | 171Yb | 1/2+ | |-id=Тулиум-171m1 | style="text-indent:1em" | 171m1Tm | colspan="3" style="text-indent:2em" | 424,9557(15) keV | 2,60(2) μс | IT | 171Tm | 7/2− | |-id=Тулиум-171m2 | style="text-indent:1em" | 171m2Tm | colspan="3" style="text-indent:2em" | 1674,43(13) keV | 1,7(2) μс | IT | 171Tm | 19/2+ | |-id=Тулиум-172 | 172Tm | style="text-align:right" | 69 | style="text-align:right" | 103 | 171,9384070(59) | 63,6(3) h | β− | 172Yb | 2− | |-id=Тулиум-172m | style="text-indent:1em" | 172mTm | colspan="3" style="text-indent:2em" | 476,2(2) keV | 132(7) μс | IT | 172Tm | (6+) | |-id=Тулиум-173 | 173Tm | style="text-align:right" | 69 | style="text-align:right" | 104 | 172,9396066(47) | 8,24(8) h | β− | 173Yb | (1/2+) | |-id=Тулиум-173m1 | style="text-indent:1em" | 173m1Tm | colspan="3" style="text-indent:2em" | 317,73(20) keV | 10,7(17) μс | IT | 173Tm | 7/2− | |-id=Тулиум-173m2 | style="text-indent:1em" | 173m2Tm | colspan="3" style="text-indent:2em" | 1905,7(4) keV | 250(69) нс | IT | 173Tm | 19/2− | |-id=Тулиум-173m3 | style="text-indent:1em" | 173m3Tm | colspan="3" style="text-indent:2em" | 4047,9(5) keV | 121(28) нс | IT | 173Tm | 35/2− | |-id=Тулиум-174 | 174Tm