Determination of 134Cs in environmental samples using a coincidence gamma-ray spectrometer

✍ Scribed by Cheng-Jong Lee; Chien Chung

• Book ID: 103922704
• Publisher: Elsevier Science
• Year: 1991
• Weight: 556 KB
• Volume: 42
• Category: Article
• ISSN: 0883-2889
• DOI: 10.1016/0883-2889(91)90211-i

✦ Synopsis

A coincidence gamma spectrometer has been used to measure the '%s activity in the presence of intense interference from "'Cs and from natural radioactivity in environmental samples. The coincidence spectrometer, with a large BGO scintillator for gating purposes and a HPGe detector for the coincident spectrum, is designed to enhance the coincidence full energy peak counting rate of "Ys and to suppress the single photon counting rate of 13'Cs as well as other natural radionuclides. An overall enhancement factor of 120 is obtained in coincidence while the interfering full energy peaks are substantially suppressed. Absolute counting efficiency of the coincidence spectrometer is calibrated for environmental samples with activity ratios of A('34Cs)/A('37Cs) down to 5 x 10m5. Other applications and the flexibility of the spectroscopic system are discussed.