OPTICAL REFERENCE, AND A METHOD OF USING SAME
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United States of America Patent
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Dec 1, 2009
Grant Date -
Dec 10, 2009
app pub date -
Jun 5, 2008
filing date -
Jun 5, 2008
priority date (Note) -
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Abstract
A detector calibration reference is disposed along a path of travel for radiation that extends from a radiation source to a radiation detector. The detector calibration reference has mutually exclusive first and second portions that are offset in a direction transverse to the path of travel, the first portion being substantially opaque to radiation from the source, and the second portion being substantially transmissive to radiation from the source. The detector calibration reference is moved relative to the path of travel in a manner so that the first and second portions become successively aligned with the path of travel.
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