https://archive.is/IYaNG
http://www.angelfire.com/me4/al_fikr/Bali_Nuked.htm
The years rolled by and top-secret projects were initiated in America and Israel to replace the old SADM with its overly heavy weight and excess radioactivity, culminating in the successful development and testing at Dimona during 1981 of the “new” micro nuclear device. Using advanced nuclear physics, the scientists found a way of detonating the new “suitcase” bomb without the use of a Uranium 238 reflector, and further refined the Plutonium 239 in its core to 99.78%. These measures resulted in a weapon considerably smaller and lighter than SADM, which also had another enormous advantage.
The new Dimona micro nuke was the very first critical weapon that could be used in “stealth” mode. Gone was the dirty Uranium 238 reflector, and up went the purity of the smaller Plutonium 239 core. You see, Plutonium emits only alpha radiation, which for all practical purposes is “invisible” to a standard Geiger counter. If you do not believe me then ask the American Environmental Protection Agency, whose staff will confirm this.
In direct contrast with its more deadly cousins beta and gamma, alpha can travel only a few feet and is incapable of penetrating human skin. If you can afford an incredibly expensive and highly specialized Muller tube or similar, you may be able to detect tiny amounts of alpha directly outside the Sari Club, though you will more than likely be defeated in this quest by the Bali environment.
Remember that this micro nuke was a tiny weapon in terms of critical mass, with its limited number of particles distributed over a very wide area. You will have to be within five feet to detect a single particle, and most may have already washed away. Bali lies in the Monsoon Belt with frequent heavy showers, and the Sari Club is located less than 200 yards away from the surf at Kuta Beach, which is where the monsoon drains in Kuta main street flow into the ocean. One week on from the blast, detection may already be too late.