A new thoron atmosphere reference measurement system. (March 2016)

• Record Type: Journal Article
• Authors: Sabot, B.; Pierre, S.; Michielsen, N.; Bondiguel, S.; Cassette, P.
• Is Part Of: Applied radiation and isotopes. Volume 109(2016:Mar.)
• Page Start: 205
• Page End: 209
• Publication Date: 2016-03
• Subjects: Thoron -- Rn-220 -- Rn-222 -- Radon -- Primary standard; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2015.11.055
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: A new thoron reference ( 220 Rn) in air measurement system is developed at the LNE-LNHB with the collaboration of the IRSN. This measurement system is based on a reference volume with an alpha detector which is able to directly measure thoron and its decay products at atmospheric pressure. In order to improve the spectrum quality of the thoron progenies, we have applied an electric field to catch the decay products on the detector surface. The developed system is a portative device which can be used to measure reference thoron atmosphere such as the BACCARA chamber at IRSN (Picolo et al., 1999 ). As this system also allows the measurement of radon ( 222 Rn) in air, it was validated using the radon primary standards made at the LNE-LNHB. This thoron measurement system will be used, at IRSN, as a reference instrument in order to calibrate the thoron activity concentration in the BACCARA facility. Highlights: New thoron in air measurement system for calibration of thoron atmosphere. Influenced by temperature, not by pressure, humidity, flow rate, activity. Measured detection efficiency agrees with simulations within uncertainties. Detection efficiency defined with a relative standard uncertainty of 0.5%.