174 Hf
173.940044 (4)
0.16 (1)
oxide
12 – 21+
176 Hf
175.941406 (4)
5.26 (7)
oxide
65 – 84+
177 Hf
176.943217 (3)
18.60 (9)
oxide
85 – 94+
178 Hf
177.943696 (3)
27.297 (7)
oxide
92 – 96+
179 Hf
178.9458122 (30)
13.629 (5)
oxide
73 – 90+
180 Hf
179.9465457 (30)
35.08 (16)
oxide
94 – 99+
Hafnium Isotopes have several applications. Hf-180 is used for the production of the radioisotope Hf-181 while Hf-180 is used for the production of the radioisotope Ta-179, which has a medical application. The second isomer of Hf-178 (Hf-178m2) exhibits very high excitation energy and it has been suggested for use in gamma ray lasers.