Naturally occurring titanium (Ti) is composed of 5 stable isotopes; 46Ti, 47Ti, 48Ti, 49Ti and 50Ti with 48Ti being the most abundant (73.8% natural abundance). Twenty-one radioisotopes have been characterized, with the most stable being 44Ti with a half-life of 60 years, 45Ti with a half-life of 184.8 minutes, 51Ti with a half-life of 5.76 minutes, and 52Ti with a half-life of 1.7 minutes. All of the remaining radioactive isotopes have half-lives that are less than 33 seconds and the majority of these have half-lives that are less than half a second.[1] The least stable is 61Ti, but it has a half-life somewhat longer than 300 nanoseconds.
The isotopes of titanium range in atomic weight from 38.01 u (38Ti) to 62.99 u (63Ti). The primary decay mode before the most abundant stable isotope, 48Ti, is β+ and the primary mode after is β-. The primary decay products before 48Ti are scandium isotopes and the primary products after are vanadium isotopes.[1]
Standard atomic mass: 47.867(1) u
nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s)[2][n 1] |
daughter isotope(s)[n 2] |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
excitation energy | |||||||||||||||
38Ti | 22 | 16 | 38.00977(27)# | <120 ns | 2p | 36Ca | 0+ | ||||||||
39Ti | 22 | 17 | 39.00161(22)# | 31(4) ms [31(+6-4) ms] |
β+, p (85%) | 38Ca | 3/2+# | ||||||||
β+ (15%) | 39Sc | ||||||||||||||
β+, 2p (<.1%) | 37K | ||||||||||||||
40Ti | 22 | 18 | 39.99050(17) | 53.3(15) ms | β+ (56.99%) | 40Sc | 0+ | ||||||||
β+, p (43.01%) | 39Ca | ||||||||||||||
41Ti | 22 | 19 | 40.98315(11)# | 80.4(9) ms | β+, p (>99.9%) | 40Ca | 3/2+ | ||||||||
β+ (<.1%) | 41Sc | ||||||||||||||
42Ti | 22 | 20 | 41.973031(6) | 199(6) ms | β+ | 313.0(10) keV | 12.6(6) µs | (3/2+) | |||||||
43m2Ti | 3066.4(10) keV | 560(6) ns | (19/2-) | ||||||||||||
44Ti | 22 | 22 | 43.9596901(8) | 60.0(11) a | EC | 44Sc | 0+ | ||||||||
45Ti | 22 | 23 | 44.9581256(11) | 184.8(5) min | β+ | 45Sc | 7/2- | ||||||||
46Ti | 22 | 24 | 45.9526316(9) | Stable | 0+ | 0.0825(3) | |||||||||
47Ti | 22 | 25 | 46.9517631(9) | Stable | 5/2- | 0.0744(2) | |||||||||
48Ti | 22 | 26 | 47.9479463(9) | Stable | 0+ | 0.7372(3) | |||||||||
49Ti | 22 | 27 | 48.9478700(9) | Stable | 7/2- | 0.0541(2) | |||||||||
50Ti | 22 | 28 | 49.9447912(9) | Stable | 0+ | 0.0518(2) | |||||||||
51Ti | 22 | 29 | 50.946615(1) | 5.76(1) min | β- | 51V | 3/2- | ||||||||
52Ti | 22 | 30 | 51.946897(8) | 1.7(1) min | β- | 52V | 0+ | ||||||||
53Ti | 22 | 31 | 52.94973(11) | 32.7(9) s | β- | 53V | (3/2)- | ||||||||
54Ti | 22 | 32 | 53.95105(13) | 1.5(4) s | β- | 54V | 0+ | ||||||||
55Ti | 22 | 33 | 54.95527(16) | 490(90) ms | β- | 55V | 3/2-# | ||||||||
56Ti | 22 | 34 | 55.95820(21) | 164(24) ms | β- (>99.9%) | 56V | 0+ | ||||||||
β-, n (<.1%) | 55V | ||||||||||||||
57Ti | 22 | 35 | 56.96399(49) | 60(16) ms | β- (>99.9%) | 57V | 5/2-# | ||||||||
β-, n (<.1%) | 56V | ||||||||||||||
58Ti | 22 | 36 | 57.96697(75)# | 54(7) ms | β- | 58V | 0+ | ||||||||
59Ti | 22 | 37 | 58.97293(75)# | 30(3) ms | β- | 59V | (5/2-)# | ||||||||
60Ti | 22 | 38 | 59.97676(86)# | 22(2) ms | β- | 60V | 0+ | ||||||||
61Ti | 22 | 39 | 60.98320(97)# | 10# ms [>300 ns] |
β- | 61V | 1/2-# | ||||||||
β-, n | 60V | ||||||||||||||
62Ti | 22 | 40 | 61.98749(97)# | 10# ms | 0+ | ||||||||||
63Ti | 22 | 41 | 62.99442(107)# | 3# ms | 1/2-# |
Isotopes of scandium | Isotopes of titanium | Isotopes of vanadium |
Index to isotope pages · Table of nuclides |