All plutonium isotopes can be used to make nuclear weapons [1], though Pu-238 would give big problems to weapon designers due to its intense decay heat. [1] ht

All plutonium isotopes can be used to make nuclear weapons [1], though Pu-238 would give big problems to weapon designers due to its intense decay heat. [1] http://cstsp.aaas.org/files/selden.pdf http://cstsp.aaas.org/files/selden.pdf