Medically, the principal threat from plutonium is from ingestion, as even the smallest amounts of Pu-239 can cause cancer and other illnesses from it's radioactive decay, principally alpha particle decay.
Medically, the principal threat from plutonium is from ingestion such as inhaling it in dust form. Even the smallest amounts of Pu-239 can cause cancer and other illnesses from it's radioactive decay, principally alpha particle decay.