Comparison of Performance Characteristics of Some Filters Using Thoron Daughters as Radioactive Aerosol

Yoshida, Yoshikazu; Kitano, Kyoshiro; Murata, Mikio; Moriyasu, Seizaburo

doi:10.1016/b978-1-4832-8312-8.50234-4

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…A filter is necessary since detectors without filter have the disadvantage that their calibration factor (CF) is dependent on the progeny deposition rates influenced by humidity, aerosol concentration, airflow and equilibrium factor of the environment (Arnold and Yu, 2000;Nikezic and Yu, 2007;Mishra and Mayya, 2008). With filter the problem is avoided since a filter applied to the inlets of the diffusion chamber grants only undisturbed diffusion of the inert radon and thoron gas (Yoshtoa et al;Stafford and Ettinger, 1972), and the counts generated by the alpha decays from radon or thoron and its progeny are proportional to the respective gas activity concentration. Due to its low dependence on environmental parameters, this method has also been set as default method by the recently released ISO standards (ISO, 2012) for passive devices.…”

Section: Monitormentioning

confidence: 98%

Monte Carlo simulation of semiconductor detector response to 222Rn and 220Rn environments

Irlinger

Trinkl

Wielunksi

et al. 2016

Journal of Environmental Radioactivity

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A new electronic radon/thoron monitor employing semiconductor detectors based on a passive diffusion chamber design has been recently developed at the Helmholtz Zentrum München (HMGU). This device allows for acquisition of alpha particle energy spectra, in order to distinguish alpha particles originating from radon and radon progeny decays, as well as those originating from thoron and its progeny decays. A Monte-Carlo application is described which uses the Geant4 toolkit to simulate these alpha particle spectra. Reasonable agreement between measured and simulated spectra were obtained for both (220)Rn and (222)Rn, in the energy range between 1 and 10 MeV. Measured calibration factors could be reproduced by the simulation, given the uncertainties involved in the measurement and simulation. The simulated alpha particle spectra can now be used to interpret spectra measured in mixed radon/thoron atmospheres. The results agreed well with measurements performed in both radon and thoron gas environments. It is concluded that the developed simulation allows for an accurate prediction of calibration factors and alpha particle energy spectra.

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