Document Details Document Type : Article In Journal  Document Title : Radon exhalation and natural radiation exposure in low ventilated rooms Radon exhalation and natural radiation exposure in low ventilated rooms   Subject : physics  Document Language : English  Abstract : In the first part of this paper, the influence of radon (Rn222) exhalation rate from walls and air exchange upon its concentration in room air was considered using a simple mathematical room model. The exhalation rates have been determined in ten low ventilated rooms of ten villas in Jeddah city (Western Province) of Saudi Arabia. An electroprecipitation method has been applied for the determination of the Rn222 gas concentration in these rooms. The mean Rn222 gas concentration was found to be 46.80 +/8.80 Bq m(3). The mean Rn222 exhalation rate was estimated to be 20.11 +/6.90 Bq m(2) h(1). The mean inhalation dose due to the exposure to Rn222 gas was calculated to be 1.18 +/2.30 mSv y(1). The second part of this paper deals with a study of natural radionuclide contents of samples collected from the building materials of these rooms under investigations in part one. Analyses were performed in Marinelli beakers with a gamma spectroscopy system to quantify radioactivity concentrations. The collected samples revealed the presence of the uraniumradium (Ra226) and thorium (Th232) radioisotopes as well as K40. The mean activity concentration of Ra226, Th232 and K40 was determined to be 48.30 +/5.08, 43.90 +/5.63 and 223.90 +/7.55 Bq kg(1), respectively. These activities amount to a radium equivalent (Raeq) of 125.96 +/15.90 Bq kg(1) and to a mean value of external hazard index (Hex) of 0.34 +/0.04.  ISSN : 0969806X  Journal Name : RADIATION PHYSICS AND CHEMISTRY  Volume : 81  Issue Number : 11  Publishing Year : 1433 AH 2012 AD  Article Type : Article  Added Date : Saturday, July 22, 2017  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email AM Abdallah, Abdallah,, A.M Investigator     M. Mohery Mohery, M. Researcher Doctorate mmohery@hotmail.com Saud J Yaghmour, Yaghmour,, Saud J Researcher Doctorate   S.H Alddin Alddin, S.H Researcher Doctorate   Files File Name Type Description  42161.pdf pdf   Back To Researches Page