Measurement of radon in air using a radon-Po-218 calibration curve determined by an absorptive non-volatile liquid scintillator

作者：Kato Takahisa^*; Janik Miroslaw; Kanda Reiko; Ishikawa Tetsuo; Kawase Masaya; Kawamoto Takuo

来源：Radiation Measurements, 2016, 95: 25-30.

DOI：10.1016/j.radmeas.2016.10.001

• Radon
• Liquid scintillation
• Radioactivity
• alpha-Spectrometry
• Nonvolatile liquid scintillator

This work reports a novel method for determining Rn-222 (radon) in air using a radon-Po-218 calibration curve constructed by an absorbable non-volatile liquid scintillator (NVLS). The ability of this method to detect low natural concentrations of radon was confirmed from linear extrapolation of the curve between 500 and 8000 Bq/m(3). The calibration curve was created from data obtained from measurements performed in a radon calibration chamber at the National Institute of Radiological Science (NIRS) by using the least-squares method. The line had high precision and stability, and the required detection time was less than that of Po-214. An absorptive NVLS was used to collect radon and was found to be highly advantageous for alpha-spectrometry liquid scintillation measurements. Variations of the Ostwald coefficient due to changes in temperature and humidity, which affect radon absorption, were investigated and discussed.

• 出版日期2016-12