Work with a noble gas scintillation counter
Pickens, Jackson R.
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More than 1450 runs were made and analyzed with a noble gas scintillation counter and its associated equip ment. The counter itself consists of a special photomultiplier tube looking into a scintillation chamber, and is used in conjunction with a vacuum and filling system, an output-pulse amplification system, and a 12-channel pulse-height analyzer. Because gas contamination presented a major problem, a dynamic gas-purification system was desigaed and effectively employed. Adequate mixing of the binary mixtures of argon and helium was a second major problem and was solved by a specially designed diaphragm pump and by close control of the flow of the constituent gases. Although the results obtained were most conclusive with pure argon and pure helium, sufficient work was completed on intermediate mixtures of these two gases to indicate that further investigation in this direction is appropriate. It is planned that future investigations will be made using xenon and krypton.