After you go to the time and expense of carefully preparing liquid scintillation samples, you shouldn't have to worry about the reliability of your data. You don't have to with a Unilux Π System. We provided the necessary counting environment to make sure your data is dependable. First, we drastically reduced complex electronic wiring and soldering through the use of integrated circuits. Your benefit is a remarkably trouble-free system. Integrated-circuit systems are more stable, because the integrated circuit itself isn't subject to the normal deviations of the many individual components it replaces. More system stability, more de pendable data. Simple. Next, we created a stable environment for the sample itself—by cooling the samples and detector at a controlled, con stant temperature. A proved method that eliminates most room-temperature count ing problems and ensures reproducible data. Quenching instabilities are taken into account, too. That's why Unilux II uses barium-133 as an external standard. Ba 133 quenches much like H 3 and Ο 4 , so when the sample spectrum shifts, the Ba 133 count rate follows along. This enables our "calculator-with-the-memory" to develop quench correction curves that cover a wide range of sample counting efficiencies. Wid er than with any other automatic method and substantially less volume dependent. The Ba 133 standard is in the right envi ronment too—centered directly under the sample vial to minimize inaccuracies caused by variations in sample volume and vial-wall-thickness. Your Nuclear-Chicago sales engineer will tell you more about the relation of counting environment to dependable data. Call him or write directly to us.
A point of view on
COUNTING ENVIRONMENT There is no room for compromise in the counting of your liquid scintillation samples. Which means counting in a stable environment with a reliable system. Which means a controlled-temperature Unilux® II.
We try to work to a point of view : yours.
NUCLEAR-CHICAGO CORPORATION A SUBSIDIARY OF G. D. S E A R L E
&
CO.
351 E. Howard Ave., Des Plaines, III. 60018 U.S.A. Donker Curtiusstraat 7, Amsterdam W. Circle No. 12 on Readers' Service Card 106 A
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ANAtYTICAt CHEMISTRY
