scholarly journals Effect of activity particle size distribution on deposition fraction of inhaled radon decay products in human respiratory system

2019 ◽  
Author(s):  
Sara Sakr ◽  
Mostafa Y. A. Mostafa ◽  
Amer Mohamed ◽  
Mona Moustafa ◽  
A. A. Ahmed
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Respiratory System ◽  
Decay Products ◽  
Deposition Fraction ◽  
Radon Decay ◽  
Human Respiratory System

A New Method for Measuring Particle Size Distribution of Radon Decay Products Using Imaging Plate

2005 ◽  
Vol 40 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Fumihiro SAITO ◽  
Shinya FURUICHI ◽  
Naureen M. RARMAN ◽  
Takao IIDA ◽  
Jun KOARASHI
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
New Method ◽  
Imaging Plate ◽  
Decay Products ◽  
Radon Decay

scholarly journals Size distributions of polycyclic aromatic hydrocarbons in urban atmosphere: sorption mechanism and source contributions to respiratory deposition

2016 ◽  
Vol 16 (5) ◽  
pp. 2971-2983 ◽  
Author(s):  
Yan Lv ◽  
Xiang Li ◽  
Ting Ting Xu ◽  
Tian Tao Cheng ◽  
Xin Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Respiratory System ◽  
Aromatic Hydrocarbons ◽  
Size Range ◽  
Particle Size Range ◽  
Polycyclic Aromatic ◽  
Human Respiratory System

Abstract. In order to better understand the particle size distribution of polycyclic aromatic hydrocarbons (PAHs) and their source contribution to human respiratory system, size-resolved PAHs have been studied in ambient aerosols at a megacity Shanghai site during a 1-year period (2012–2013). The results showed the PAHs had a bimodal distribution with one mode peak in the fine-particle size range (0.4–2.1 µm) and another mode peak in the coarse-particle size range (3.3–9.0 µm). Along with the increase in ring number of PAHs, the intensity of the fine-mode peak increased, while the coarse-mode peak decreased. Plotting of log(PAH / PM) against log(Dp) showed that all slope values were above −1, suggesting that multiple mechanisms (adsorption and absorption) controlled the particle size distribution of PAHs. The total deposition flux of PAHs in the respiratory tract was calculated as being 8.8 ± 2.0 ng h−1. The highest lifetime cancer risk (LCR) was estimated at 1.5  ×  10−6, which exceeded the unit risk of 10−6. The LCR values presented here were mainly influenced by accumulation mode PAHs which came from biomass burning (24 %), coal combustion (25 %), and vehicular emission (27 %). The present study provides us with a mechanistic understanding of the particle size distribution of PAHs and their transport in the human respiratory system, which can help develop better source control strategies.

Radon decay products in realistic living rooms and their activity distributions in human respiratory system

2013 ◽  
Vol 162 (3) ◽  
pp. 394-399 ◽  
Author(s):  
M. Mohery ◽  
A. M. Abdallah ◽  
S. S. Baz ◽  
Z. M. Al-Amoudi
Keyword(s):  
Respiratory System ◽  
Decay Products ◽  
Radon Decay ◽  
Human Respiratory System

Effects of Particle Size Distribution on Corrosion Rate of Carbon Steel in Soil

2020 ◽  
Vol 69 (4) ◽  
pp. 102-106
Author(s):  
Shota Ohki ◽  
Shingo Mineta ◽  
Mamoru Mizunuma ◽  
Soichi Oka ◽  
Masayuki Tsuda
Keyword(s):  
Particle Size ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Particle Size Distribution ◽  
Size Distribution
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