Radon exhalation and its dependence on moisture content from samples of soil and building materials

Environmental monitoring and indoor radon measurement are important for public health, to estimate the cancer risk of respiratory system and, if necessary, to suggest proper methods that reduce indoor radon level. In this research, indoor radon concentration in the air has been measured in 150 apartments in Mashhad city. The result demonstrates about 94.7% of apartments have radon concentration less than 100 Bq/m3, taken by WHO as the action level, and 5.3% have the concentration higher than this level. As well as, annual radon dose has been assessed using the equation for annual effective dose calculation introduced by United Nations Scientific Committee on the Effects of Atomic Radiation.

Indoor radon measurement and effective dose assessment of 150 apartments in Mashhad, Iran

Measurements of indoor gamma radiation and radon concentrations in dwellings of Riyadh city, Saudi Arabia.

Radon exhalation rate for phosphate rocks samples using alpha track detectors

The results of radon concentration measurements carried out in dwellings with natural ventilation for 1 y in Bangalore are reported. Measurements, covering three sessions of the day (morning, afternoon, night) were performed two times in a month for 1 y at a fixed place of each dwelling at a height of 1 m above the ground surface in selected dwellings. The low-level radon detection system (LLRDS), an active method, was used for the estimation of radon concentration. The measurements were aimed to understand the diurnal variation and the effect of ventilation rate and flooring type on indoor radon concentration. The geometric mean (Â± geometric standard deviation) of indoor radon concentration from about 500 measurements carried out in 20 dwellings is found to be 25.4 Â± 1.54 Bq m. -3. The morning, afternoon and night averages were found to be 42.6 Â± 2.05, 15.3 Â± 2.18 and 28.5 Â± 2.2 Bq m. -3, respectively. The approximate natural ventilation rates of the dwellings were calculated using the PHPAIDA-the on-line natural ventilation, mixed mode and air infiltration rate calculation algorithm and their effects on indoor radon concentrations were studied. The inhalation dose and the lung cancer risk due to indoor radon exposure were found to be 0.66 mSv y. -1 and 11.9 per 10. 6 persons, respectively. The gamma exposure rate was also measured in all the dwellings and its correlation with the inhalation dose rate was studied. Â© The Author 2011. Published by Oxford University Press. All rights reserved.

N.Q. Muhamad

Papers

Measurement of indoor radon levels in Erbil capital by using solid state nuclear track detectors