The present invention provides an -particle-emitting radioisotope chelation complex comprising 225Actinium (225Ac) and 1,4,7,10,13,16-hexaazacyclohexadecane-N,N,N,N,N,N-hexaacetic acid (HEHA) (225Ac-HEHA). Also provided is a bifunctional HEHA, and a bifunctional 225Ac-HEHA. The bifunctional HEHA and the bifunctional 225Ac-HEHA can be conjugated to a targeting agent. In view of the above, the present invention provides a method of making HEHA and methods of making a bifunctional HEHA, including a conjugate thereof. Also provided are a method of treating disease, a method of treating cancer, a method of decontaminating a sample from 225Ac, a method of decontaminating a person who has been externally contaminated with 225Ac, and a method of detoxifying a person who has internalized 225Ac.

 
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