Scintillation Counters for Radioactive Sample Measurement
- 1 December 1951
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 22 (12) , 912-914
- https://doi.org/10.1063/1.1745827
Abstract
A gamma‐ray counter for liquid or solid samples is described. It uses an RCA 5819 phototube at room temperature with a thallium activated sodium iodide crystal in the shape of an annular ring. The gamma‐ray counting efficiencies of this counter for 2‐milliliter samples of Fe59, Co60, and I131 are about equal to the beta‐particle counting efficiency of a mica‐window G‐M counter when counting thin samples. When the counter is heavily shielded, the background is about 160 counts per minute. The phototube operating voltage is not critical since over a wide range of operating voltage the counting efficiency and background count change only slightly. A directional gamma‐ray counter is also described.Keywords
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