Counting Efficlency of Gamma Rays in Counter Tubes

概要

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The counting efficiency of gamma rays in cylindrical counters and end window counters is examined by means of a very thin sheet and a collimated fine pencil beam of gamma rays. The distribution of the number of gamma rays emitted from the thin slit is measured by means of a end-window counter or by the effect of the fine anode wire of the cylindrical counter. When the plane of thin sheet of gamma rays reaching from side to a cylindrical counter is parallel to the axis, the counting efficiency registers a maximum value at the position where the sheet of gamma rays is in contact with the inner surface of the counter, and a smaller value near the central wire, but when the pencil beam of gamma rays is parallel to the anode wire and the gamma rays entering the counter through the end-window plate, the counting efficiency gives a maximum value at the anode wire and the inner surface of the counter. An average efficiency for a sheet of gamma rays which are in a plane perpendicular to the counter axis is also investigated.
社団法人日本物理学会の論文
1961-02-05