My question, however, is this. Why did he install a radioactive bomb, powerful enough to kill power armoured troops, into the purifying chamber of his purifer? I mean what the [censored]. It is clearly a method of rendering the purifier useless, contaminating it and therefore making it unable to be activated; kind of like a self-destruct mechanism. He can't of known that the Enclave would show any interest in his purifier, especially when nobody had heard anything from them aside from the radio in two decades; even the radio itself was not understood by most people who thought that it was pre-war and the BoS were surprised when the Enclave spawned so surely they didn't know either. What motivation did James have for building it in there? He couldn't have known that the Enclave would come so who was he expecting to attack?