Photon counting: when light measurement isdifficult-andcrucial. Few developments have so greatly enhanced light measurements as photon counting. By increasing sensitivity and stability, photon counting has opened the way to a wide range of highprecision applications. For example: At Case Western Reserve University Hospital, the Department of Neurology has been using fluorometric techniques in the analysis of biogenic amines and their metabolites in biologic material of diverse origin. Dr. Mars comments, "With low concentrations and conventional analog techniques, it became apparent that differences between sample and reagent blank were frequently too small to permit adequate confidence in the procedures." Now, since the installation of an Ortec photoncounting system, ". . . photon counting has extended our capabilities in the measurement of low sample concentrations, has significantly enhanced the ease and reliability of processing large numbers of samples, and has eliminated human error in recording the results."
Dr. H. Mars, University Hospital, Case Western Reserve University.
For complete information on Ortec photoncounting systems, write or call Life Sciences Division, Ortec Incorporated, 100 Midland Road, Oak Ridge, TN 37830; (615) 482-4411. Worldwide sales and service.
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ANALYTICAL CHEMISTRY, VOL. 49, NO. 3, MARCH 1977 · 299 A
