Patent ID: 7829867

Claim:
An irradiation apparatus for inactivating pathogens or white blood cells in a fluid containing blood components comprising: at least one radiation emitting source, said source emitting radiation suitable for inactivating pathogens or white blood cells in a fluid containing blood components; and a control unit for controlling the radiation emitting source, a radiometer in electrical communication with said control unit, said radiometer comprising a first elongated optical chamber having a first slot between said at least one radiation emitting source and said optical chamber, said first slot for receiving at least some of said radiation into said optical chamber and a photo sensor responsive to said received radiation in said optical chamber, a first elongated integrating chamber optically coupled to said first optical chamber by a second slot and wherein said sensor is in said first integrating chamber, wherein said second slot is generally perpendicular to said first slot with respect to an axis of symmetry of said first optical chamber.