Abstract: A detonator comprising a case into which is inserted a quantity of an explosive composition, a semiconductor bridge positioned adjacent one end of the explosive composition which is electrically connected to a spark gap and in some embodiments a capacitor and a bleeder resistor. A pair of electrically conductive wires are connected to the spark gap and semiconductor bridge to provide a means for passing an electrical charge to the semiconductor bridge. The detonator also may include an r.function. attenuator, such as a ferrite bead, through which the electrically conductive wires pass. The ends of the detonator case are sealed by any appropriate means.

Abstract: A method and means for sealed joinder of case and cap members of a capsular shaped charge wherein opposing frustoconical shoulders are formed in adjacent walls of a case and cap and a resilient ring is retained therein to hold the case and cap in operative assembly and an elastomeric ring is positioned in a groove in the case member whereby it is under compressive deformation between the case and cap members when joined to seal the shaped charge from external pressures and fluids while allowing relative rotation of case and cap; wherein increasing external pressures, as in the well bore, will increase the sealing effect and strength of joinder of the assembly.