No, Hafnium is a perfect structural material that can be used, in part, for initiation of / production of small scale Active Agents.

Since Active Agents act in many ways as an electron, having a material that has a high melting point lowers the probability of degradation during the production of the Active Agent, having a 0 electron affinity means it is unlikely to take on board produced AAs and having low conductivity means that any that are taken on board, would not propagate well. Also there is a good spread of isotopes, which may mean that perfect resonance within the metal is unlikely and transmutation products in the metal could balance to Hafnium in the absence of any lighter elements in the AAs. IMPO, this is a good overall combination of properties.

You would want to use light gaseous elements for nucleation of the AAs to give the maximum yield in nucleon balancing reactions.