Development of the absolute standardization apparatus for radon-222 activity. (April 2018)

• Record Type: Journal Article
• Authors: Liang, Juncheng; Yang, Zhijie; Wang, Liyuan; Li, Zexi; Zhang, Ming; Liu, Haoran; Yuan, Daqing
• Is Part Of: Applied radiation and isotopes. Volume 134(2018:Apr.)
• Page Start: 358
• Page End: 362
• Publication Date: 2018-04
• Subjects: Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2017.07.055
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: A defined solid angle counting apparatus for radon-222 activity absolute measurement is presented. Two home-made vacuum sealed radium-226 sources with radioactivity of 500 kBq and 3MBq are used to minimize the impact from gas impurities. The defined solid angle is calculated using precisely measured geometrical parameters by several algorithms. The result from Monte Carlo simulation agrees with results obtained by other methods within the estimated uncertainty limit. Alpha particle's scattering behavior in the measurement chamber and collimator is simulated by the geant4 code and a total scattering alpha particle ratio of 0.23% as well as a relative uncertainty contribution to activity measurement of 0.02% to 0.09% are estimated. A typical total combined standard uncertainty of 0.28% is evaluated for the radon activity primary measurement. Highlights: Two home-made vacuum sealed radium-226 sources with radioactivity of 3 MBq and 500 kBq are used to generate high-purity radon gas. Alpha particle's scattering behavior is simulated by geant4 code and the result shows a total scattering alpha particle ratio up to 0.23%, while the corresponding uncertainty of activity calculation is evaluated to be 0.02–0.09%. A typical combined standard uncertainty of 0.28% is evaluated for the radon activity primary measurement.