Electric field steering cap, steering electrode, and modular configurations for a radiation detector

A cap for a radiation detection device of the type that utilizes a semiconductor medium includes a bias connection pad, a steering electrode, and a shielding layer. The steering electrode may be a grid steering electrode positioned parallel to the bias connection pad opposite a medium, or may be an electrode disposed perpendicular to the bias connection pad along the edge of a medium. The bias connection pad may be electrically connected or equipotent to the steering electrode. The cap may be formed of flexible circuit board, which may also connect the semiconductor detector to bias, detection or processing circuitry. The bias connection pad and the shielding layer can be maintained with fixed spacing to prevent vibration. A mezzanine card may be used to connect multiple detectors in a modular fashion.