An electronic read circuit for a radiation detector comprises: an element sensitive to the radiation, an injection circuit, able to inject a charge at one terminal of the sensitive element, the injection circuit extending between at least one input terminal and one output terminal, the output terminal being able to be connected to the sensitive element, the injection circuit being able to produce a charge under the effect of a trigger pulse. The injection circuit is able to inject a first charge when an input terminal is connected to a first input potential and a second charge when an input terminal is connected to a second input potential. The circuit comprises means for storing a difference between an output potential of the injection circuit, called equilibrium potential, and a reference potential, such that the second charge depends on the second input potential and on the equilibrium potential.