In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± ...In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± 3.1 Bq/m<sup>3</sup>) to (190.00 ± 2.7 Bq/m<sup>3</sup>) with an average value (113.66 ± 30.2 Bq/m<sup>3</sup>);in the first one we draw the map radiations for indoor radon gas concentrations in Baghdad governorate. We would like to mention that the present study is considered to be very important and vital because it is concerned with people health and safety in the first place.展开更多
Objective:To explore the level of indoor radon concentration especially after recent 3 decades’great economic development in metropolis Beijing,so as to describe the outline of indoor radon level in Beijing.Methods:A...Objective:To explore the level of indoor radon concentration especially after recent 3 decades’great economic development in metropolis Beijing,so as to describe the outline of indoor radon level in Beijing.Methods:A one-year integrated measurement on 800 dwellings was carried out from September 2018 to August 2019.Passive integrated radon cup monitor with CR-39 as an alpha-track detector was adopted for the survey.As a pilot study,measurement scheme was designed in detail.For measurement quality control,the background track density of CR-39 was strictly defined and controlled throughout the operation of the survey.Results:The annual geometric and arithmetic mean of radon concentration of the surveyed are(39.3±12.9)and(42.0±13.7)Bq/m^(3),respectively,varying from(12.1±2.5)to(119.0±7.8)Bq/m^(3).Radon concentration of the ground floor dwellings is obviously higher than that of other floors.No difference of radon level is found among the dwellings of other floors.Higher radon concentration in buildings built after 2010 is obtained compared with buildings built in 1980s,1990s,and 2000s.Conclusions:There is no big change of radon concentration level in dwellings in Beijing area observed in general compared with a previous survey performed more than ten years ago.For high-rise buildings,building materials are suggested to be the main source of indoor radon.For higher radon concentration in buildings built in latest ten years,the change on building materials and indoor ventilation rate are thought to be the causes,further study in detail is needed to clarify.展开更多
文摘In the present work, radon gas concentrations in different dwellings in Baghdad governorate are measured by using RAD-7 detector. The results have shown that, the radon gas concentrations ranged between (40.67 ± 3.1 Bq/m<sup>3</sup>) to (190.00 ± 2.7 Bq/m<sup>3</sup>) with an average value (113.66 ± 30.2 Bq/m<sup>3</sup>);in the first one we draw the map radiations for indoor radon gas concentrations in Baghdad governorate. We would like to mention that the present study is considered to be very important and vital because it is concerned with people health and safety in the first place.
文摘Objective:To explore the level of indoor radon concentration especially after recent 3 decades’great economic development in metropolis Beijing,so as to describe the outline of indoor radon level in Beijing.Methods:A one-year integrated measurement on 800 dwellings was carried out from September 2018 to August 2019.Passive integrated radon cup monitor with CR-39 as an alpha-track detector was adopted for the survey.As a pilot study,measurement scheme was designed in detail.For measurement quality control,the background track density of CR-39 was strictly defined and controlled throughout the operation of the survey.Results:The annual geometric and arithmetic mean of radon concentration of the surveyed are(39.3±12.9)and(42.0±13.7)Bq/m^(3),respectively,varying from(12.1±2.5)to(119.0±7.8)Bq/m^(3).Radon concentration of the ground floor dwellings is obviously higher than that of other floors.No difference of radon level is found among the dwellings of other floors.Higher radon concentration in buildings built after 2010 is obtained compared with buildings built in 1980s,1990s,and 2000s.Conclusions:There is no big change of radon concentration level in dwellings in Beijing area observed in general compared with a previous survey performed more than ten years ago.For high-rise buildings,building materials are suggested to be the main source of indoor radon.For higher radon concentration in buildings built in latest ten years,the change on building materials and indoor ventilation rate are thought to be the causes,further study in detail is needed to clarify.
