Technetiun-99 m (99m Tc) is a widely used and versatile radioisotope obtained from the beta decay of molybdenum (99 Mo). 99 Mo can be produced by thermal fission or neutron activation process. Production of 99 Mo via the neutron capture method draws attention as an alternative to fission derived 99 Mo due to non-proliferation issues. The main concern with neutron capture-produced 99 Mo (n, γ) over the common fission-produced involves both lower Curie yield and lower specific activity. In this work, different adsorbents using low specific activity 99 Mo for 99m Tc generator have been discussed.