Patent ID: 6940944

Claim:
A method of radiation processing of a product package o of essentially equal rectangular size in a device having a radiation source, a collimator having a variable aperture, and a turntable, said radiation processing resulting in a point in the product package where the dose is minimal (D min point) and a point in said product package where the dose is maximal (D max point) comprising the stops of: determining a first value of the collimator aperture, by increasing said aperture from a small value, where the D max point is located near the centre of the product package, up to a value where the D max point moves near to the centre of a small side of said package's rectangular horizontal cross-section; determining a second value of the collimator aperture, by further increasing the collimator aperture up to a point where the D min point moves from a point near the corner of the product package to the centre of said package; processing said package with radiation, the collimator aperture being kept at a constant value comprised between said first and said second value, the turntable being rotated at a variable speed.