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This is from Table 17 of "Selected Aspects of Plutonium in the Environment, 

and Its Toxicity."



Agent                Action & Site             Approximate amount to cause

                                               death in hours to days.

Pu (ingest)           GI tract                         500 mg

Pu (inhal)            Pul. edema                        25 mg

HCN                   Blood anoxia                      50 mg

Parathion             Blocked synapses                 100 mg

Arsenic               Chemical poison                  120 mg

Botulism toxin        Resp. paralysis                5 E-5 mg