Monolithic active pixel radiation detector with shielding techniques

A monolithic active pixel radiation detector, comprising:

• a substrate comprising a silicon layer upon which electronic circuits are configured;
• a plurality of channels formed on said silicon layer, wherein said plurality of channels is connected to sources of charge signals, wherein a source of said charge signals among said sources of charge signals is biased entirely or partially in depletion in a high-resistivity bulk layer of said substrate, wherein said charge signals are collected by implanted electrodes and flow through electrically conducting vias established in an isolation oxide on said substrate;
• at least one first nested well, implanted deep and configured from said substrate, wherein said at least one first nested well comprises a signal collection electrode assists in a collection of charge carriers released in interaction with radiation and wherein at least one second nested well, implanted shallower and entirely confined in said at least one first nested well, so as to separate said electronic circuits from a sensing portion of said substrate, wherein said at least one second nest well comprises a shallow well;
• and
• a buried oxide configured from said substrate wherein said shallow well is located beneath said buried oxide and is entirely electrically isolated through confinement inside said at least one first nested well and comprises an AC-ground plane that is tied to a fixed potential.