Modern techniques and applications in Cherenkov counting Page: 1 of 19
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LIQUID SCINTILLATION COUNTING
MODERN TECHNIQUES AND APPLICATIONS IN CERENKOV COUNTING*
H. H. Ross
G. T. Rasmussen**
Analytical Chemistry Division
Oak Ridge National Laboratory
Oak Ridge, Tennessee, USA
Cerenkov counting, a relatively unknown technique in the
laboratory five years ago, has recently become the method
of choice for counting many beta-emitting nuclides on a
routine basis. The interest in this method is due, in
part, to the ease in employing conventional liquid scintil-
lation counting equipment without modification. Unfortu-
nately, this similarity in measurement routine and equip-
ment has led some investigators to believe that procedures
developed for organic scintillation counting are directly
applicable to Cerenkov systems. Unfortunately, this is far
from true. Therefore, the following presentation has a
three-fold purpose. First, a general review of the Ceren-
kov physical process is presented. Particular attention
is given to the mechanism of Cerenkov radiation production,
energy input-output characteristics, and spacial phenomena.
The unusual properties of Cerenkov systems and how they may
be used to advantage in practical counting situations is
stressed. Also, an attempt is made to delineate important
points of departure between organic liquid scintillation
and Cerenkov methods. A second objective is to describe
special measurement techniques that have been applied to
Cerenkov counting problems. Among those discussed are the
use of waveshifters, solvent selection, quenching, and
standardization procedures. Finally, we will present the
results of an original study concerning a computer simu-
lation of the Cerenkov process that we have developed to
establish optimal counting conditions for dual isotope
*Research sponsored by the U. S. Atomic Energy Commis-
sion under contract with Union Carbide Corporation.
**Former student participant in Great Lakes College M S E
Association program at ORNL.
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Ross, H.H. & Rasmussen, G.T. Modern techniques and applications in Cherenkov counting, article, January 1, 1972; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1030287/m1/1/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.