X-ray detection in packaging
Angle dispersive X-ray diffraction is used to test pharmaceutical products including a dosage form inside packaging, for example a tablet inside a blister pack, without removing the dosage form from the packaging. The dosage form is aligned with a measurement system having an X-ray source for generating X-rays, X-ray optics, and an X-ray detector for detection of X-rays. Then, at least one X-ray signature is measured on a predetermined location on the dosage form. The measured X-ray signature is compared with reference X-ray signatures in a data library.
1. A system for checking pharmaceutical products including a pharmaceutical dosage form inside packaging, comprising:
a measurement system having an X-ray source for generating X-rays, X-ray optics, and an X-ray detector for detection of X-rays to obtain a measured X-ray signature;
a holder for carrying the packaging with the dosage form inside for measurement by the measurement system;
a data library containing one or more reference X-ray signatures for at least one pharmaceutical product, wherein the data library includes data giving at least one predetermined location on the dosage form for at least one respective pharmaceutical product; and
a comparison means for comparing a measured X-ray signature with the reference X-ray signatures;
wherein:
the X-ray optics are arranged to create a convergent and/or parallel beam;
the X-ray detector is mounted on a goniometer for detection of X-rays as a function of angle as the measured X-ray signature; and
further comprising a controller for driving the holder to align the predetermined location on the dosage form with the measurement system for measurement.
2. A system according to claim 1 , wherein the X-ray source generates X-rays at a plurality of characteristic wavelengths and wherein the library includes respective reference X-ray signatures at the characteristic wavelengths.
3. A system according to claim 1 , wherein:
the controller is arranged to control the holder to capture a plurality of measured X-ray signatures at a plurality of predetermined locations on of dosage form and measurement system; and
the comparison means is arranged to compare the measured X-ray signatures with a plurality of reference X-ray signatures.
4. A system according to claim 1 , wherein
the controller is arranged to control the holder to capture a plurality of measured X-ray signatures of different type; and
the comparison means is arranged to compare the measured X-ray signatures with a plurality of reference X-ray signatures.
5. A system according to claim 1 , wherein the controller is arranged to control the holder to capture measurements of X-ray absorption as a function of horizontal position of the holder and to align the holder to align at least one predetermined location on the dosage form with the measurement system from the captured measurements of X-ray absorption as a function of position.
6. A system according to claim 1 , wherein the controller is arranged to control the holder to capture measurements of X-ray absorption as a function of horizontal position of the holder and to align the holder to align at least one predetermined location on the dosage form with the measurement system from the captured measurements of X-ray absorption as a function of position.
7. A system according to claim 1 , wherein the reference signatures stored in the library include a plurality of reference signatures relating to the active pharmaceutical ingredient, the excipient, the coating or the packaging separately or combined.
8. A system according to claim 1 , wherein the controller is arranged to align the holder horizontally, then vertically, and then to align the dosage form in the at least one predetermined location.
9. A system according to claim 1 , wherein the X-ray optics are arranged to focus the X-ray beam on the X-ray detector to measure the X-ray signature in a transmission geometry.
10. A system according to claim 1 wherein the X-ray detector is a pixel detector measuring X-rays as a function of position.
11. A system according to claim 1 wherein the X-ray signatures include X-ray powder diffraction signatures.
12. A system according to claim 1 wherein the X-ray signatures include Small Angle X-ray scattering signatures.
13. A system according to claim 1 wherein the X-ray signatures include the geometrical dimensions of the dosage form.
14. A system according to claim 1 wherein the X-ray signatures include the RAMAN spectrum.
15. A method for checking pharmaceutical products including a pharmaceutical dosage form inside packaging, comprising:
mounting a pharmaceutical product on a holder;
aligning the pharmaceutical product with a measurement system having an X-ray source for generating X-rays, X-ray optics, and an X-ray detector for detection of X-rays;
obtaining information specifying a specific part of the pharmaceutical from a library, wherein the data library includes data relating the respective specific parts of the pharmaceutical for respective pharmaceutical products;
measuring an X-ray signature on the specific part of the pharmaceutical as a function of diffraction angle; and
comparing the measured X-ray signature with reference X-ray signatures.
16. A method according to claim 15 including positioning the pharmaceutical in a particular location inside the packaging cavity before taking measurements.
17. A method according to claim 15 including measuring a plurality of X-ray signatures on a plurality of different specific parts of the pharmaceutical as a function of diffraction angle.
18. A method according to claim 15 further comprising aligning the pharmaceutical so that the X-ray beam takes the shortest path through the sample from side to side.