A photodiode detector assembly for use with an ionizing radiation detector, the assembly includes a first layer having a first side and a second side and an array of backlit photodiodes disposed at the second side, and a second layer disposed proximate to and opposing the second side of the first layer. An example method includes receiving, at a first online service provider, a plurality of profile information items from a user and storing, by the first online service provider, the profile information items in an identity profile associated with the user. Upon receiving and rejecting an access probe, the HNB can negotiate with a surrounding macro network to provide service for the UE. The pad wear compensation apparatus includes an adjustment knob attached to the housing for rotation about a rotation axis and fixed against axial movement.