Stable Calibration Means for Apparatus for Photo Reduction of Contaminants in Blood
An apparatus for irradiating blood or blood products, preferably with ultra violet or visible light, to reduce contaminants in the blood or blood products. A removable radiometer having light integrating chambers detects the light intensity, allowing the radiation characteristics of the apparatus to be calibrated. The light chambers have an aluminum reflecting surface prepared by machining, grit blasting, polishing and plasma treatment including plasma cleaning and oxidation.
1 . An irradiation apparatus for inactivating pathogens or white blood cells in a fluid containing blood components comprising:
at least one radiation emitting source emitting radiation; and
a control unit for controlling the radiation emitting source,
a radiometer in electrical communication with said control unit, said radiometer comprising a first optical chamber having an aperture for receiving at least some of said radiation and a photo sensor responsive to said received radiation in said optical chamber, said optical chamber having a bead-blasted aluminum reflective surface.
2 . The irradiation apparatus of claim 1 wherein said reflective surface is polished.
3 . The irradiation apparatus of claim 2 wherein said reflective surface further comprises a layer of aluminum oxide.
4 . The irradiation chamber of claim 3 wherein said layer of aluminum oxide is at least about 200 nm in thickness.
5 . The irradiation chamber of claim 4 wherein said layer of aluminum oxide is at most about 600 nm in thickness.
6 . The irradiation chamber of claim 5 wherein said layer of aluminum oxide is formed on said aluminum reflective surface by consecutive plasma treatments including plasma cleaning and oxidation.
7 . A method of making a radiometer comprising
forming a concave reflective surface in an aluminum part,
bead-blasting said surface,
polishing said surface,
securing said part to the RF electrode,
mounting said part and said cradle in a plasma pretreatment apparatus, and having consecutive steps of plasma cleaning and plasma oxidation to form a layer of aluminum oxide.
8 . The method of claim 7 wherein said plasma oxidation forms said layer of aluminum oxide to a thickness of at least 200 nm.
9 . The method of claim 8 wherein said plasma oxidation forms said layer of aluminum oxide to a thickness of not more than 600 nm.
10 . A radiometer for measuring ambient light, said radiometer comprising a first optical chamber having an aperture for receiving at least some of said radiation and a photo sensor responsive to said received radiation in said optical chamber, said optical chamber having a bead-blasted aluminum reflective surface.
11 . The radiometer of claim 10 wherein said reflective surface is polished.
12 . The radiometer of claim 11 wherein said reflective surface further comprises a layer of aluminum oxide.
13 . The radiometer of claim 12 wherein said layer of aluminum oxide is at least about 200 nm in thickness.
14 . The radiometer of claim 13 wherein said layer of aluminum oxide is at most about 600 nm in thickness.
15 . The radiometer of claim 14 wherein said layer of aluminum oxide is formed on said aluminum reflective surface by plasma treatment.
16 . An apparatus for providing a diffuse reflective surface with stable optical properties, the apparatus comprising:
a polished, bead-blasted aluminum reflective surface, said surface having a layer of aluminum oxide,
said layer of aluminum oxide being at least about 200 nm in thickness and at most about 600 nm in thickness.
17 . A method of making a diffuse reflective surface with stable optical properties, said method comprising
forming a reflective surface in an aluminum part,
bead-blasting said surface,
polishing said surface,
mounting said part in a plasma pre-treatment apparatus, and having consecutive steps of plasma cleaning and plasma oxidation to form a layer of aluminum oxide to a thickness of at least 200 nm.
18 . The method of claim 17 wherein said ions and atoms form said layer to a thickness of not more than 600 nm.