Calibration system for radon EEC measurements

Mostafa, Mostafa; Vasyanovich, M. E.; Zhukovsky, Michael; Zaitceva, N.

doi:10.1093/rpd/ncv316

Cited by 11 publications

(6 citation statements)

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“…Experiments were carried out in an indoor air laboratory and in a standard chamber under controlled conditions of radon concentration [20,21]. Additional aerosol particles were injected using ECs.…”

Section: Methodsmentioning

confidence: 99%

Effect of electronic cigarette (EC) aerosols on particle size distribution in indoor air and in a radon chamber

2019

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Particle size distribution is an important factor governing whether aerosols can be deposited in various respiratory tract regions in humans. Recently, electronic cigarette (EC), as the alternative of tobacco cigarette, has become increasingly popular all over the world. However, emissions from ECs may contribute to both indoor and outdoor air pollution; moreover, comments about their safety remain controversial, and the number of users is increasing rapidly. In this investigation, aerosols were generated from ECs and studied in the indoor air and in a chamber under controlled conditions of radon concentration. The generated aerosols were characterized in terms of particle number concentrations, size, and activity distributions by using aerosol diffusion spectrometer (ADS), diffusion battery, and cascade impactor. The range of ADS assessment was from 10−3 μm to 10 μm. The number concentration of the injected aerosol particles was between 40 000 and 100 000 particles/cm3. The distribution of these particles was the most within the ultrafine particle size range (0–0.2 μm), and the other particle were in the size range from 0.3 μm to 1 μm. The surface area distribution and the mass size distribution are presented and compared with bimodal distribution. In the radon chamber, all distributions were clearly bimodal, as the free radon decay product was approximately 1 nm in diameter, with a fraction of ~0.7 for a clean chamber (without any additional source of aerosols). The attached fraction with the aerosol particles from the ECs had a size not exceeding 1.0 μm.

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Section: Methodsmentioning

confidence: 99%

Effect of electronic cigarette (EC) aerosols on particle size distribution in indoor air and in a radon chamber

2019

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“…On the left side, the shape of analytical filter AFA-RSP-20 is presented. In the real experiment after radioactive aerosols filtration through the filter, the filter is placed in the front of scintillation detector to measure the alpha activity (real experiment used in many times [10]). The distance between the end of filter and the surface detection area of detector is ~ 3 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the use of AFA-filters for EEC calibration measurement system in previous work [10], the aim of this study is to present a Monte Carlo simulation, to evaluate the penetration/transmission efficiency of the alpha particles through radiometric analytical filter AFA-RSP-20 (3.5 ± 0.5 mg/cm 2 ) which is widely used in alpha radiometric measurements [10]. In this research, the SRIM software package (The Stopping and Range of Ions in Matter) is used [4].…”

Section: Introductionmentioning

confidence: 99%

ALPHA SELF-ABSORPTION EVALUATION IN RADIOMETRIC FILTER MATERIAL FOR THE NATURAL RANGE OF ALPHA ENERGY (5-9 MeV)

Mostafa¹,

Zhukovsky²

2019

RAD Conference Proceedings

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In this paper, SRIM (The Stopping and Range of Ions in Matter) software package is used to simulate the interaction of alpha particles into the material of radiometric analytical filters. The effect of alpha particle selfabsorption in alpha radiometric filters measurements is estimated, especially in the range of natural alpha energy (5-9 MeV, Radon and Thoron alpha energy). Software package SRIM allows to calculate the parameters of the ions interaction with target material using a Monte Carlo simulation method based on a quantum mechanical treatment of ion-atom collisions. The effect of the radiometric analytical filter material on the transmitted efficiency of alpha energy is discussed. As the energy increases the self-absorption in analytical filter material is decreased but still has a clear effect. In this case, the filter material and the space distance between the filter and the detector window decrease the number of alpha particles which reach to the detector window.

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“…The absolute detection efficiency for the 214 Bi line (609.3 keV) was found to be 2.05 x 10 -2 ±3% for the 95% confidence interval. The uncertainty in this detection efficiency was obtained by the least squares method using the experimental data of the energy dependence detection efficiency in the Spectra Line Ultimate Gamma Lab program (Mostafa et al, 2015(Mostafa et al, , 2016. The fit quality for this polynomial efficiency was directly tested in each experiment by measuring the total absorption peaks of the Cs standard source with the activity 10.64 ±0.19 kBq (P = 0.99 and k = 2.58), traceable to the same set of calibration sources, E γ = 661.66 keV (close to the energy line of 214 Bi, i.e., 609.3 keV).…”

Section: Radioactivity Measurements Using Germanium Detectorsmentioning

confidence: 99%

“…Because the existence of a radon standard system for radon sources is very important, over the last year, a series of experiments on radon equilibrium equivalent concentrations (EECs) (Mostafa et al, 2015) were conducted and a radon activity concentration standard system was launched (Mostafa et al, 2016). The radon concentration standard system in open flow mode was realised by the pumping of air through an emanation chamber containing the radium source.…”

Section: Introductionmentioning

confidence: 99%