Activity size distribution of some natural radionuclides

3^rd International Conference on Smart Materials & Structures

March 20-22, 2017 Orlando, USA

Zain M Al-Amoudi

King Abdulaziz University, KSA

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

In this study, the results concerning the activity size distribution of the long-lived (210Pb) radon decay product aerosols and the thoron decay product aerosols (212Pb) and (7Be) of the outdoor atmosphere are presented. Also, the mass size distribution of the aerosol particles is determined. The low-pressure Berner cascade impactor Model 20/0.015 was used as a sampling device. The activity size distribution of these radionuclides was determined by one log-normal distribution (accumulation mode) whereas the mass size distribution was by two log-normal distributions (accumulation and coarse mode). The activity median aerodynamic diameter (AMAD) of 212Pb was found to be 305 nm with a geometric standard deviation (sg) of 2.41. The specific air activity concentration of 212Pb was found to be 0.14 + 0.012 Bq m23. An AMAD of 210Pb of 610 nm with sg of 1.8 was determined, whereas that of 550 nm with sg of 1.97 was determined for 7Be. The specific air activity concentration of 210Pb and 7Be was found to be 0.0016+2.5`31024 and 0.00348 + 4` 31024 Bq m23, respectively. Using a dosimetric model, the total deposition fraction as well as the total equivalent dose has been evaluated considering the observed parameters of the activity size distribution of 212Pb. At a total deposition fraction of �21 %, the total equivalent dose was found to be 0.41 mSv.

Biography :

Zain M Al-Amoudi has completed Doctor of Philosophy in Science (Experimental Physics) from King Abdulaziz University (KAU), KSA. She is the Head of Physics Department since 4 years and has published more than 15 papers in reputed journals. She has attended and participated in many national and international conferences.

Email: zalamoudi@windowslive.com