Hello all. I am not a physicist and would probably be considered a "physics idiot" by people on this site, so please excuse any ignorance on my part. I am writing a book and need some help with the physics of nuclear weapons. For the purposes of my book, I am looking to have one of my characters create what I as a layman would call a "short term irradiation nuclear weapon" (please forgive if the verbiage is incorrect). From my research, i have surmised that this could not be any type of in use weapon, as all appear to have fission as some part of the "equation", and this would create long term irradiation in the affected areas. If anyone out there could give me some guidance, theoretical or factual, as to how this type of weapon might be created it would be very helpful to me for the purposes of my book. Feel free to be as "theoretical" as you like, The more fantastical the better provided the science actually would work. In short, a weapon which the "desired effects" last for only a few minutes or days, and then cease. Thanks in advance for any help.