X-ray or gamma ray systems or devices – Specific application – Absorption
Reexamination Certificate
2005-09-06
2005-09-06
Church, Craig E. (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Absorption
C378S069000
Reexamination Certificate
active
06940944
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 (Dminpoint) and a point in said product package where the dose is maximal (Dmaxpoint) comprising the steps of:determining a first value of the collimator aperture, by increasing said aperture from a small value, where the Dmaxpoint is located near the centre of the product package, up to a value where the Dmaxpoint 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 Dminpoint 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.
REFERENCES:
patent: 4788701 (1988-11-01), Barrett
patent: 5396074 (1995-03-01), Peck et al.
patent: 6504898 (2003-01-01), Kotler et al.
patent: WO 03/028771 (2003-04-01), None
Artman Thomas R.
Church Craig E.
Ion Beam Applications S. A.
Merchant & Gould P.C.
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