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Photo detection system

  • US 4,485,308 A
  • Filed: 04/26/1982
  • Issued: 11/27/1984
  • Est. Priority Date: 04/26/1982
  • Status: Expired due to Fees
First Claim
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1. An improved photo detection system which includes a low energy x-ray source positioned to irradiate objects marked with a plurality of phosphors having diffferent emission color characteristics including an x-ray excitable phosphor selected from the class of inorganic rare earth containing compounds activated with a rare earth ion and exhibiting minimum afterglow, a plurality of optical photo detection means positioned adjacent said x-ray source and each being selectively responsive to the emission color produced by a single phosphor, and one or more objects which have been marked on the surface with a medium containing said phosphors.

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