A 3 liter liquid helium counter has been assembled and used i n two experimental configurations. s c i n t i l l a t i o n chamber is described i n terms of these experiments, and the pulse height and resolution characteristics of t h e counter are given f o r the case where two 5 in. diam phototubes v i e w the l i q u i d helium with good geometry.The operation of the https://ntrs.nasa.gov/search.jsp?R=19690028800 2018-05-11T04:59:44+00:00Z
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