Method and apparatus for X-ray irradiation having improved throughput and dose uniformity ratio
First Claim
1. A method of radiation processing of a product package 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 (Dmin point) and a point in said product package where the dose is maximal (Dmax point) comprising the steps of:
- determining a first value of the collimator aperture, by increasing said aperture from a small value, where the Dmax point is located near the centre of the product package, up to a value where the Dmax 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 Dmin 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.
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Abstract
The present invention is related to a method and apparatus of radiation processing of a product package 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 (Dmin point) and a point in said product package where the dose is maximal (Dmax point) comprising the steps of:
- determining a first value of the collimator aperture, by increasing said aperture from a small value, where the Dmax point is located near the centre of the product package, up to a value where the Dmax 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 Dmin 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.
3 Citations
6 Claims
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1. A method of radiation processing of a product package 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 (Dmin point) and a point in said product package where the dose is maximal (Dmax point) comprising the steps of:
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determining a first value of the collimator aperture, by increasing said aperture from a small value, where the Dmax point is located near the centre of the product package, up to a value where the Dmax 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 Dmin 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. - View Dependent Claims (2, 6)
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- 3. Apparatus for radiation processing of packages comprising a radiation source, a collimator having a variable aperture, and a turntable, characterized in that said collimator is adapted for adjusting its aperture prior to irradiation of a package.
Specification