List of Isotopes

Isotope	Natural Abundance	Isotopic Mass	Half- Life
Ta-155		154.97459(54)#	13(4) µs [12(+4-3) µs]
Ta-156		155.97230(43)#	144(24) ms
Ta-156m			0.36(4) s
Ta-157		156.96819(22)	10.1(4) ms
Ta-157m1			4.3(1) ms
Ta-157m2			1.7(1) ms
Ta-158		157.96670(22)#	49(8) ms
Ta-158m			36.0(8) ms
Ta-159		158.963018(22)	1.04(9) s
Ta-159m			514(9) ms
Ta-160		159.96149(10)	1.70(20) s
Ta-160m			1.55(4) s
Ta-161		160.95842(6)#	3# s
Ta-161m			2.89(12) s
Ta-162		161.95729(6)	3.57(12) s
Ta-163		162.95433(4)	10.6(18) s
Ta-164		163.95353(3)	14.2(3) s
Ta-165		164.950773(19)	31.0(15) s
Ta-165m
Ta-166		165.95051(3)	34.4(5) s
Ta-167		166.94809(3)	1.33(7) min
Ta-168		167.94805(3)	2.0(1) min
Ta-169		168.94601(3)	4.9(4) min
Ta-170		169.94618(3)	6.76(6) min
Ta-171		170.94448(3)	23.3(3) min
Ta-172		171.94490(3)	36.8(3) min
Ta-173		172.94375(3)	3.14(13) h
Ta-174		173.94445(3)	1.14(8) h
Ta-175		174.94374(3)	10.5(2) h
Ta-176		175.94486(3)	8.09(5) h
Ta-176m1			1.1(1) ms
Ta-176m2			3.8(4) µs
Ta-176m3			0.97(7) ms
Ta-177		176.944472(4)	56.56(6) h
Ta-177m1			410(7) ns
Ta-177m2			3.62(10) µs
Ta-177m3			5.31(25) µs
Ta-177m4			133(4) µs
Ta-178		177.945778(16)	9.31(3) min
Ta-178m1			2.36(8) h
Ta-178m2			59(3) ms
Ta-178m3			290(12) ms
Ta-179		178.9459295(23)	1.82(3) a
Ta-179m1			1.42(8) µs
Ta-179m2			335(45) ns
Ta-179m3			322(16) ns
Ta-179m4			9.0(2) ms
Ta-179m5			1.6(4) µs
Ta-179m6			54.1(17) ms
Ta-180	0.012%	179.9474648(24)	8.152(6) h
Ta-180m1			>1.2E+15 a
Ta-180m2			31.2(14) µs
Ta-180m3			2.0(5) µs
Ta-180m4			17(5) µs
Ta-181	99.988%	180.9479958(19)	STABLE
Ta-181m1			6.05(12) µs
Ta-181m2			18(1) µs
Ta-181m3			25(2) µs
Ta-181m4			210(20) µs
Ta-182		181.9501518(19)	114.43(3) d
Ta-182m1			283(3) ms
Ta-182m2			15.84(10) min
Ta-183		182.9513726(19)	5.1(1) d
Ta-183m			107(11) ns
Ta-184		183.954008(28)	8.7(1) h
Ta-185		184.955559(15)	49.4(15) min
Ta-185m			>1 ms
Ta-186		185.95855(6)	10.5(3) min
Ta-186m			1.54(5) min
Ta-187		186.96053(21)#	2# min [>300 ns]
Ta-188		187.96370(21)#	20# s [>300 ns]
Ta-189		188.96583(32)#	3# s [>300 ns]
Ta-190		189.96923(43)#	0.3# s