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cm, with a 2.5 cm cavity and golden age a plutonium plug to allow initiator insertion; mass 6.2 kg air gap beryllium–polonium-210 "initiator" (the "urchin"), neutron source golden age [edit] Interior of bomb The original blueprints of the interior of both Fat Man and Little Boy are golden age still classified. However, there is much information about the main parts. AN 219 destruct fuse Archie radar antenna Plate with batteries (to detonate charge surrounding nuclear components) X-Unit, a firing set placed near the charge Hinge fixing the two ellipsoidal parts of the bomb High explosive pentagonal lens (12 units around the core, made of high and low velocity explosive), together with the next item forming the pattern of a truncated icosahedron High explosive hexagonal lens (20 units around the core, made of high and low velocity explosive) California Parachute tail (aluminium) Dural casing, ~140 cm inner diameter Cones that contained the whole sphere Explosive lenses (low and high velocity) Nuclear material (see other figure for details about the different layers) Plate with instruments (radars, baroswitches and timers)
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